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Videos uploaded by user “90GTVert”
Project 49 - Clutch Spring Engagement Comparison - 49cc Two Stroke Scooter Performance
 
01:56
This video shows the difference in stock, 1,000RPM, 1,500RPM, and 2,000RPM clutch spring engagement. It also shows a commonly overlooked issue when selecting clutch spings. Follow Project 49 at http://www.49ccScoot.Com for all the details.
Views: 91848 90GTVert
Harbor Freight Chicago Electric Ultrasonic Cleaner Foil Test
 
05:57
A foil test and a spark plug cleaning test using the Chicago Electric ultrasonic cleaner from Harbor Freight along with Simple Green and water.
Views: 68599 90GTVert
Scooter How-To : GY6 Valve Adjustment (Also For Buggy + Kart)
 
05:26
How to adjust the valves on a GY6 engine, common in scooters and go-karts. At the time of the video, I was using 0.004"/0.005" regularly. Now I tend to use 0.002" intake and 0.003" exhaust. The loose settings will work, but may cause more noise (clatter). My Patreon : https://www.patreon.com/49cc
Views: 405183 90GTVert
Shelby GT500 Mustang Rollover Crash At Unoffical H2Oi In Ocean City, MD
 
01:43
It looks like the driver spun tires and stayed in it (pause and check out the skid marks). Hit the median, chopped off a tree, and landed on the roof. Crazy wreck. This happened in OC MD during the unofficial H2Oi weekend. According to local news, no one was injured. #H2Oi #MustangCrash #GT500Crash
Views: 93882 90GTVert
Project 49 - Rollers Vs Sliders - 49cc Scooter Performance Comparison 50cc
 
01:59
Roller weights vs Sliding Weights : 0-35MPH 49cc Minarelli / Jog / 1E40QMB 1000RPM Contra Lightened Clutch Shoes Get all of the details and more info at 49ccScoot.Com and don't forget to Like the video and Subscribe for more! *****Copyright Info***** Sound clip is an original work written and recorded by me.
Views: 24426 90GTVert
What Does Detonation / Spark Knock Sound Like?
 
02:15
Clips containing the sound of spark knock on my scooter. This is a Minarelli two-stroke engine, but most engines exhibit somewhat similar sounds; even large automotive engines. I've used graphics to help point out where the spark knock is in each clip. Spark knock, detonation, knock, and ping are common terms. I hope the video is helpful. Thank you for watching. Please Like, Share, and Subscribe for more. #SparkKnock #Detonation #Ignition
Views: 108547 90GTVert
Minarelli / Jog / 1E40QMB Scooter Performance : Ignition Timing Advance Modification
 
02:55
A video showing how to modify the stock ignition to allow the timing to be adjusted. The video also compares performance with different ignition timing settings. Mod at your own risk. Keep up with Project 49 by subscribing and by visiting http://www.49ccscoot.com Thanks for watching.
Views: 20484 90GTVert
Scooter Carburetor Tuning : Listening For Rich And Lean Conditions (Carb)
 
01:47
The sound of rich and lean.
Views: 104985 90GTVert
Piston Notching : Cutting Or Modifying Valve Reliefs
 
05:15
Ideas for DIY piston notching to increase piston to valve clearance by curing depth and misalignment issues. Freehand cutting and making and using your own notching tool are shown. Please Like, Favorite, and Subscribe for more. Thank you for watching! Find more P2V clearance information in my other videos : https://www.youtube.com/watch?v=oZghWIpqquc https://www.youtube.com/watch?v=sLe6-AgbtlA https://www.youtube.com/watch?v=4_ZdcAE67L0
Views: 90808 90GTVert
Easy 50cc Scooter Stator Charging / Lighting Check : 139QMB GY6 50 QMB139 49cc
 
02:18
A simple way to see if your stator is doing it's job. Much easier than going through a manual and checking resistance readings IMO. The readings in manuals don't always match up to good working stators. Checking for AC output is quick and easy if you have a multimeter. Like, favorite, and subscribe if you found it helpful and want to see more. Thank you for watching.
Views: 77819 90GTVert
139QMB (GY6 50) Kick Starter Assembly : 50cc Scooter Help
 
08:04
Kick start installation for a 139QMB/1P39QMB/QMB139 49cc scooter engine.
Views: 37911 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 13 : Installing The Trunk
 
02:13
Part 13, the final part, of my Chinese scooter PDI assembly series details the installation of a scooter trunk. Please Like, Favorite, and Subscribe for more! Thank you for watching! More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 19605 90GTVert
Two-Stroke Scooter / ATV Carburetor Settings And Adjustments 2of4 : Idle Speed & Mixture
 
04:37
Part 2 of a 4 part video detailing all of the basic settings and adjustments of the carburetors found on Minarelli / Jog / 1E40QMB powered 50-90cc scooters and youth ATVs. Part 2 shows how to adjust the idle speed and mixture settings. Please like the video if you found it to be helpful. My Patreon : https://www.patreon.com/49cc
Views: 1465180 90GTVert
Time-Sert Thread Repair - Heli-Coil Alternative
 
08:27
A video showing how to repair damaged threads with a Time-Sert kit. It's an alternative to heli-coils, that I think is a lot better. I've used their spark plug thread repair kit with success and after seeing how well it worked I started using them instead of heli-coil thread repair kits. Sorry I'm not a great speaker, but it gets the point across. Please like and favorite this video. Thanks for watching.
Views: 104914 90GTVert
GY6 50 Scooter Crankshaft Oil Seal Removal & Install With Lisle Puller
 
02:53
Removal and installation of a 139QMB four-stroke scooter's CVT side crank seal with the Lisle 58430 shaft style puller. The puller was about $15, and worth every penny IMO. It won't do all seals on scoots because of space limitations, but it saves a lot of time/effort on the ones it can pull. The installation is done with PVC pipe. Thank you for checking out the vid. Please Like, Favorite, and Subscribe for more!
Views: 19517 90GTVert
Gy6 50cc Chinese Scooter PAIR System Removal : 139QMB Emissions : Racing Only
 
04:46
This video shows the removal of the PAIR system that introduces air into the exhaust stream on a GY6 50 powered Chinese scooter ( Tao Tao ATM50-A1 ). There really isn't a performance benefit if the system is functioning properly, and some believe removal of this system can lead to clogging of the catalytic converter. PAIR systems and the air they move into the exhaust stream could be detrimental to the accuracy of user-installed exhaust mounted metering systems. DO NOT REMOVE ANY EMISSIONS COMPONENTS ON ANY SCOOTER THAT WILL BE USED ON PUBLIC ROADWAYS! OFF-ROAD / RACING USE ONLY! THESE COMPONENTS ARE REQUIRED TO MEET EPA STANDARDS FOR ROAD VEHICLES! Like, Favorite, and Subscribe for more!!!
Views: 102151 90GTVert
Piston To Valve Clearance Info : Helpful For Scooters, Motorcycles, & More
 
03:47
Information about piston to valve (P2V) clearance. What is P2V clearance? What affects it? How can piston to valve clearance be changed? The information in this video is relevant to many four-stroke engines, with specifications intended for small engines like scooters and motorcycles. Larger engines, like V8s will generally use larger clearances, for example 0.080" intake and 0.100" exhaust, but the other information should be useful for most applications. Thanks for watching! Don't forget to Like if the video was useful or interesting and subscribe for more! Related videos : https://www.youtube.com/watch?v=4_ZdcAE67L0 https://www.youtube.com/watch?v=sLe6-AgbtlA https://www.youtube.com/watch?v=Jpk2pKASjBE
Views: 100586 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 9 : Engine And Gear Oil Change
 
07:21
Part 9 of the Chinese scooter PDI assembly video series goes over both the engine and gearbox oil changes for a GY6 50 / 139QMB / 1P39QMB engine in detail. This video also shows the swap to magnetic drain plugs for the crankcase and gearbox. Please Like, Favorite, and Subscribe for more videos! Thank you for watching. More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 50494 90GTVert
What's Wrong With This Thing : GY6 150cc Problem
 
02:17
This happened to me yesterday. I had numerous ideas before I made it home. I'm posting the clip so you can see if you can guess what it was (solution at the end) and so people can hear and see what happens just in case it's of use or ever happens to you. ***Spoiler Alert*** The sounds heard are commonly telltale signs of a fuel delivery issue. The "waaa" sound is usually a lean condition. In addition to what's seen in the video, check things like petcock operation, float height, fuel line routing, carburetor jetting/adjustments, airbox/filter condition, vacuum hoses and connections. Four-strokes don't suffer them much, but the first scene is somewhat similar to a soft seize. Sometimes the engine just stops, other times it dies slowly. The engine usually starts after being off for a short period of time. These are caused by the piston expanding more than the bore and seizing up. Usually from improper jetting (lean) because of the heat the piston is subjected to. Some engines will do this quickly if WOT is used before the rest of the engine gets up to operating temp. Scuffing or scarring of the piston and cylinder bore at 4 corners is a common result of a soft seize. Keep those ideas in mind and if your scooter ever does something similar, maybe it'll help you diagnose and fix it a little easier.
Views: 13197 90GTVert
Valve Removal & Installation Method 3 : Hardly Any Tools Required
 
02:47
In 3 videos I show how to remove and install valves and valve springs three different ways on scooter or motorcycle or other small engine cylinder heads. This third video shows removal and installation using hardly any tools. A socket, magnet, and a hammer are all I used, and the magnet is optional. Video 1 shows removal and installation with a valve spring compressor. https://youtu.be/Hof8Aiw1cdo Video 2 shows how to do the job with a specialty tool. https://youtu.be/WjtfKCbOqbw Please Like, Favorite, & Subscribe for more! Thanks for watching!
Views: 11097 90GTVert
Scooter Compression Test How To : Scooter / Moped Help Tutorial
 
03:44
How to check the compression of your scooter's engine using the proper tools. Like and Subscribe for more help and visit us at http://www.49ccscoot.com
Views: 75401 90GTVert
Easy Clutch Spring Installation For 50cc Scooters : 139QMB GY6 50 How-To
 
02:41
An easy way to install clutch springs, stock or racing / performance, for the 139QMB 49cc / 50cc four-stroke engine and other scooters. If you need to know how to get the clutch off, check out the video below... http://www.youtube.com/watch?v=2EjW-iSP-Q8 Here's an alternate method of removing and installing clutch springs... http://www.youtube.com/watch?v=D_Xzv59VhM4 Thanks for watching. Please Like the video if you found it helpful and Subscribe for more!
Views: 45301 90GTVert
Project TaoTao : First Ride ( Tao Tao ATM50-A1 GY6 50 Four-Stroke Scooter )
 
01:41
The first ride on my new TaoTao ATM50A1 Chinese scooter. It's powered by a 49cc four-stroke engine ( 1P39QMB ). All stock other than an idle mixture adjustment and items covered in a thorough PDI (see my other videos for more info).
Views: 17931 90GTVert
How-To : GY6 125 / 150 Kick Start Gear Installation (Scooter, Kart, ATV)
 
08:59
How to install the kick start gears on a 125-150cc GY6 four-stroke engine, common in scooters, ATVs, buggies, and karts. Step by step instructions. Please Like, Favorite, and Subscribe for more! Thanks for watching.
Views: 164037 90GTVert
Removing A Broken Bolt Or Stud With A Bolt Extractor
 
01:04
Just a quick video showing the simple process of extracting a broken off bolt.
Views: 205652 90GTVert
Valve Removal & Installation Method 2 : Specialty Tool (Very Easy)
 
05:53
In 3 videos I show how to remove and install valves and valve springs three different ways on scooter or motorcycle or other small engine cylinder heads. This second video shows removal and installation using a specialty tool. Video 1 shows removal and installation with a valve spring compressor. https://youtu.be/Hof8Aiw1cdo Video 3 shows how to do the job with only basic tools. https://youtu.be/3pl8tLUovck Please Like, Favorite, & Subscribe for more! Thanks for watching!
Views: 12090 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 8 : Ignition Upgrades And Checks
 
04:00
Part 8 of the Chinese scooter PDI video series covers replacing the spark plug and spark plug cap with quality components for better reliability. Please Like, Favorite, and Subscribe for more videos and thanks for watching! More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 44165 90GTVert
Scooter How-To : Alternate Crankshaft Installation Method
 
01:51
This vid shows a slightly different order to install a crankshaft and bearings using the heat and chill method. The other videos are linked below, so check them out too. http://www.youtube.com/watch?v=swAccxBopSs http://www.youtube.com/watch?v=l6y4KMgVP1E
Views: 13101 90GTVert
Ignition Pickup And Stator Checks For AC Scooters, ATVs, & More
 
09:54
How to check the resistance and voltage output of the pickup or pulse coil and the exciter coil with a multimeter. These test are useful for no-start / no spark troubleshooting. The pickup coil checks should apply to AC or DC CDI ignition systems on scooters, ATVs, and go karts. DC CDI systems use battery power rather than AC power from an exciter coil in the stator so the exciter coil check does not apply for models using DC ignition systems. I've never seen official specifications published for checking AC output, so these are numbers that usually work for me. Resistance values are from service manuals and you can find them at 49ccScoot.Com or by using your favorite search engine. Please Like, Favorite, and Subscribe for more if this video was helpful. Visit 49ccscoot.Com for additional troubleshooting resources or post your question on the forum. Thanks for watching!
Views: 221089 90GTVert
Using The Motion Pro V3 Cable Luber : Motorcycle Scooter ATV : Throttle, Brake, Clutch
 
07:45
How to use the new Motion Pro v3 Cable Luber. I liked it more than the older style of cable lubers. It can be used on throttle, brake, and clutch cables on motorcycles, scooters, mopeds, ATVs... and pretty much anything else with small diameter cables. This is not a paid product placement. I paid for the product and just happened to like it enough to make a video. Thanks for watching! Please Like, Share, and Subscribe for more! #CableLube #MotoMaintenance #ScootTools
Views: 9862 90GTVert
Project 49 : Increasing Compression : 49cc Two-Stroke Scooter Performance
 
02:07
This video shows the results I saw when increasing compression ratio on the 1E40QMB Minarelli / Jog 2T engine. Times are slower than usual from a headwind, but the results still show. Mod at your own risk. Always pay close attention to any warning signs like spark knock or peppering on the spark plug. I suggest having a way to measure temperature if you wish to increase compression very much. Get all of the details at http://www.49ccscoot.com
Views: 10933 90GTVert
TMAX 500 Slider Weight Comparison (15-17g + 19g Roller Weights)
 
04:00
0-60MPH, 50-80MPH, and cruise RPM compared with different weights in a TMAX 500. Which one works the best? Watch and see. My apologies for the wind noise. I just installed a new piece of fur for the camera housing and apparently it isn't working very well. Thanks for watching. Please like, share, and subscribe for more! My Patreon : https://www.patreon.com/49cc #TMAX #Sliders #TMAXPerformance
Views: 10032 90GTVert
TaoTao ATM50-A1 49cc Four-Stroke Chinese Scooter Uncrating 50cc Tao Tao
 
05:34
This video shows the process of removing a new scooter from the shipping container step by step. Check out my other videos to see a full PDI (Post Delivery Inspection) covering the entire process of a proper setup to help avoid future problems. Like, Favorite, and Subscribe for more! Thank you for watching. More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 40039 90GTVert
139QMB Gearbox Bearing Replacement Part 1 (GY6 50cc Scooter)
 
07:54
Part 1 (of 2) showing the replacement of the gearbox, aka final drive transmission, bearings in a 139QMB / GY6 50cc scooter. Part one covers disassembly and removal of the bearings. Part 2 covers installation and reassembly. Part 2 : https://www.youtube.com/watch?v=0vLYPXNnhtg The scooter is a 2013 TaoTao ATM50-A1. Please Like, Favorite, Share, and Subscribe for more! Thanks for watching!
Views: 48489 90GTVert
Project TaoTao : Carb & CVT Tuning, Airbox Restriction, & Keihin PD19J Swap : 50cc Scooter
 
11:32
This update covers carburetor and CVT transmission tuning, airbox restriction removal, and a Keihin PD19J carb swap. I go through the steps of getting a stock scooter in a good basic form of tune with an easy method and show how to remove the restriction from the air box's inlet. The tuning method is good for any scooter owner. I often use the same process on my two-strokes. Please Like and Subscribe for more! Thanks for watching! ***Intro music is original content by, and the property of, the author of this video (90GTVert).***
Views: 95625 90GTVert
Setting Up A Degree Wheel And Finding True Top Dead Center (TDC)
 
14:36
Information about degree wheels. What their purpose is, choosing a degree wheel, and how to setup a degree wheel on true top dead center (TDC) using a piston stop. This video should be useful for most single cylinder engines. Even on a multi-cylinder engine, the technique is the same, but you would generally be setting up the degree wheel using the #1 cylinder. Printable Degree Wheel http://49ccscoot.proboards.com/thread/2229/printable-2t-specific-degree-wheel Thanks for watching. Please Like, Favorite, and Subscribe for more!
Views: 105632 90GTVert
Modifying Roller Weights Or Sliders For CVT Tuning
 
08:29
Multiple ways to modify rollers or sliders to make them heavier or lighter. Useful information for anyone that doesn't want to buy multiple sets of rollers for tuning their CVT, or for anyone in need of a very specific weight.
Views: 326653 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 1 : Battery Prep And Wheel Install
 
07:16
The first part of a series of videos covering the PDI (Post Delivery Inspection) and assembly of a Tao Tao ATM50A1 Chinese scooter in great detail. The proper setup can save you a lot of headaches and breakdowns in the future, so I advise spending the time to do it properly. These videos should allow even the novice mechanic to perform a PDI with confidence. This first part covers battery preparation and charging, front wheel installation, and assembly of the center stand. Thank you for watching. Be sure to check out the rest of the series and please Like, Favorite, and Subscribe for more! More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 48457 90GTVert
Rubber Softening Experiment : Wintergreen Oil, Brake Fluid, ATF & More
 
15:19
Rubber parts may harden as they age from oxidation, oils dissolving in chemicals that parts are in contact with or evaportaion, and other reasons. That makes them tough to use or unable to function properly. I used a couple of old rubber scooter intake tubes to test some rubber softening techniques and see what worked and what didn't. Please Like, Share, and Subscribe for more! My Patreon : https://www.patreon.com/49cc Thanks for watching! #RubberSoftening #Experiment #RubberResto
Views: 62383 90GTVert
Project TaoTao : Winter Update : Snow Scootin'
 
03:04
Winter Update (Update 5) A brief update about what's been going on with Project TaoTao this winter, including some experiences with cold weather riding gear. Subscribe so you won't miss an update! Get all of the details at : http://49ccscoot.proboards.com/thread/6365/project-taotao-stroke-experiences-upgrades
Views: 8336 90GTVert
Remove & Install Scooter / Motorcycle Wheel Bearings The Easy Way
 
05:02
A simple way to remove and install scooter or motorcycle wheel bearings without any expensive specialty tools. I've also got a how-to showing the full process with wheel removal and installation and using a bearing puller in the link below. http://49ccscoot.proboards.com/thread/381/replace-front-wheel-bearing Please Like, Share & Subscribe for more! Thank you for watching! #WheelBearings #ScooterHelp #ScootHowTo
Views: 9131 90GTVert
Belt Busting Update And Beach Rides
 
13:12
An update about the belt breaking situation that was detailed in a recent vid. I show some of the things I checked and fixed and what the results were, as well as 320 miles in 24 hours to see if it would hold up. If you haven't seen the video about breaking belts, here it is : https://www.youtube.com/watch?v=v-rIWprA4PQ Thanks for watching. If you enjoy the vids, please Like, Share, and Subscribe for more! My Patreon : https://www.patreon.com/49cc Need help with your scooter or want to chat about scoots? Join the forum : http://www.49ccscoot.proboards.com #49ccScoot #CVT #BeltBusting
Views: 154244 90GTVert
Trail Tech Vapor Gauge : Part  3 : Settings And Accuracy Adjustments
 
07:21
Part 3 of a 3 part video series covering the Trail Tech Vapor gauge. This part covers settings and setup of the Vapor as well as how to dial in the speedometer's tire size setting for increased accuracy. Part 1 Overview : https://www.youtube.com/watch?v=j6Z_hAhJJ2M Part 2 Installation : https://www.youtube.com/watch?v=9A5oq70SG_w Thanks for watching! Please Like, Share, Favorite, and Subscribe for more! #TrailTech #Gauges #Speedometer *I am in no way affiliated or associated with Trail Tech. These videos were made because I get a lot of questions about this gauge in the comments sections of multiple videos where it is seen. Trail Tech was kind enough to let me use some of their stock photos of their parts for my videos.*
Views: 8293 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 10 : Engine And CVT Fasteners
 
02:55
Part 10 of the Chinese scooter PDI assembly video series goes over the nuts and bolts of the engine and CVT transmission briefly. Please Like, Favorite, and Subscribe for more! Thanks for watching! More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 26710 90GTVert
50-90cc Minarelli Scooter & Youth ATV Kickstart Installation How To (Kick Start Starter)
 
05:54
***Always use caution when working around the kickstart parts with tension on them. Keep your fingers away from them the best you can and wear eye protection. Use the techniques in this video at your own risk.*** Minarelli / Jog / 1E40QMB scooter and youth ATV engine kickstarter installation tutorial. There are alternate methods, but this is the one I use. It can be done in 1 to 2 minutes if you aren't talking to a camera. My Patreon : https://www.patreon.com/49cc ---------- Outro music was written and recorded by me, the author and uploader of this video. ----------
Views: 220813 90GTVert
Simple Bearing Installation Using Basic Hardware (Bolt, Nut, Washers) Easy DIY Tool
 
02:58
A cheap and easy method for installing bearings into many locations. I was installing a bearing into the case of a scooter engine in this video, but the idea can be used in many other areas. Please Like, Favorite, and Subscribe for more! Thank you for watching!
Views: 8627 90GTVert
Scooter CVT Clutch Removal & Installation How To
 
04:05
This is just a quick video to show how I take my clutch apart and reassemble it. Use any info at your own risk. There are other ways of doing this job, this is mine with no special tools.
Views: 116139 90GTVert
TaoTao ATM50-A1 Chinese Scooter PDI Assembly Part 6 : Fuel Supply And Hoses
 
06:12
Part 6 of the Chinese scooter PDI assembly series shows how to replace the fuel and vacuum hoses as well as how to switch over from the stock vacuum operated petcock to a manual fuel shutoff valve. Please Like, Favorite, and Subscribe for more! Thanks for watching. More Info http://49ccscoot.proboards.com/thread/8006/chinese-scooter-assembly-pdi
Views: 95714 90GTVert
Two-Stroke Scooter / ATV Carburetor Settings And Adjustments 4of4 : Jetting & Float Height
 
08:05
Part 4 of a 4 part video detailing all of the basic settings and adjustments of the carburetors found on Minarelli / Jog / 1E40QMB powered 50-90cc scooters and youth ATVs. Part 4 talks about the main jet, pilot jet, and float level. Please like the video if you found it to be helpful. If you need a main jet kit for a carburetor like this that uses Mikuni VM11/22 jets, try part number 114-50 at http://www.partsforscooters.com/?partner=49CCSCOOT
Views: 176774 90GTVert
Highway 21 Radiant Heated Gloves Tests & Review : Battery Powered Winter Gear
 
09:32
A full review of the Highway 21 Radiant battery powered heated gloves as well as tests of their capabilities. I guess I didn't mention anything about fit, so I'll add that they seem pretty true to fit for me. Sometimes I need to go a size up, especially if gloves are noted as European sizing. In case it's of any use, here are some glove brands that I have or had and what sizes worked for me : Highway 21 : XXL Firstgear : XXL Olympia : XXL Cortech : XXXL Scorpion : XXXL Five : XXXL Alpinestars : XXL was too tight and XXXL was not available in the glove I tried. Thanks for watching! Please Like, Share, and Subscribe for more. #HeatedGloves #WinterGear #MotorcycleGloves
Views: 1957 90GTVert