GY6 150cc Scooter Cutting out above 37MPH

gmcjetpilot · 12-02-2017, 09:17 PM

Well my scooter was running OK but the plug said LEAN. I up'ed the main jet and the plug now has a little color, but TOP SPEED was still about 52 MPH (hoping it would help). It is like the ignition is cutting off. It continues to accelerate to 42 mph. Any TIPS to trouble shoot. I had the plug back out and checked the gap an color.

The scooter starts easy, idles nice. has good low speed acceleration, but right at 37 mph like clock work it misses.

I have done some work that was unrelated to fixing this issue, but just FYI:

Removed the emission system
Removed the vacuum fuel petcock and put a manual one on.
(The above work was after the problem and the bike is running great at low speed)

12-02-2017, 09:17 PM	#1
gmcjetpilot Join Date: May 2017 Posts: 37	GY6 150cc Scooter Cutting out above 37MPH Well my scooter was running OK but the plug said LEAN. I up'ed the main jet and the plug now has a little color, but TOP SPEED was still about 52 MPH (hoping it would help). It is like the ignition is cutting off. It continues to accelerate to 42 mph. Any TIPS to trouble shoot. I had the plug back out and checked the gap an color. The scooter starts easy, idles nice. has good low speed acceleration, but right at 37 mph like clock work it misses. I have done some work that was unrelated to fixing this issue, but just FYI: Removed the emission system Removed the vacuum fuel petcock and put a manual one on. (The above work was after the problem and the bike is running great at low speed)
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