GY6 150cc valve question

culcune · 11-07-2016, 06:42 PM

My 2004 TGB 150cc scooter utilizes a GY6 engine. I watched a video on valves and followed the video and set them for .005 as the guy did on his Chinese scooter.

It started and idled, but on my commute at WOT, I lost about 5 to 7 mph and I could feel the loss (like it went from upscale Taiwanese to lowly Chinese, LOL). Is .005 the correct setting, and yes, I did look all over Google specifically for TGB 150cc and could not find anything TGB specific. Some of the other GY6 150cc videos call for .002 or .003. I tried my friends at Excalibur, but could not get hold of anyone.

If anyone has a suggestion for GY6 150cc valve settings, I am all ears. I am not looking forward to opening the engine back up due to the fact that the body does not come off conveniently like the Chinese bikes in the videos, and I have a several inch by several inch rectangular opening to work with, but I wouldn't mind as much if someone can suggest better settings.

tortoise · 11-08-2016, 12:20 AM

Everyone has their own preference.

The service manual for the Buddy 125 (Taiwan PGO) references .08mm/.003 inches.

The sidewall thickness of an aluminum beverage can is around .0035 inches.

Speed reduction can be attributed to several issues, including drive belt wear and low tire pressure.

culcune · 11-09-2016, 04:47 PM

I got the specs from Alan--.005 is the correct size for intake and exhaust according to the techs at TGB in Taiwan

11-07-2016, 06:42 PM	#1
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,056	GY6 150cc valve question My 2004 TGB 150cc scooter utilizes a GY6 engine. I watched a video on valves and followed the video and set them for .005 as the guy did on his Chinese scooter. It started and idled, but on my commute at WOT, I lost about 5 to 7 mph and I could feel the loss (like it went from upscale Taiwanese to lowly Chinese, LOL). Is .005 the correct setting, and yes, I did look all over Google specifically for TGB 150cc and could not find anything TGB specific. Some of the other GY6 150cc videos call for .002 or .003. I tried my friends at Excalibur, but could not get hold of anyone. If anyone has a suggestion for GY6 150cc valve settings, I am all ears. I am not looking forward to opening the engine back up due to the fact that the body does not come off conveniently like the Chinese bikes in the videos, and I have a several inch by several inch rectangular opening to work with, but I wouldn't mind as much if someone can suggest better settings. __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
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11-09-2016, 04:47 PM	#3
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,056	I got the specs from Alan--.005 is the correct size for intake and exhaust according to the techs at TGB in Taiwan __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
	0

11-08-2016, 12:20 AM	#2
tortoise Join Date: Jan 2008 Posts: 221	Everyone has their own preference. The service manual for the Buddy 125 (Taiwan PGO) references .08mm/.003 inches. The sidewall thickness of an aluminum beverage can is around .0035 inches. Speed reduction can be attributed to several issues, including drive belt wear and low tire pressure.
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