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TheGageinator · 03-19-2017, 10:34 PM

I have a strange problem going on with my 2007 163fml (200cc) engine. It slightly stumbles at a certain RPM. From WOT it pulls hard until about 3/4 of Max RPM, it stumbles a little until the rpms go higher, then it clears up and pulls hard again to redline. It does the same on all 4 gears.

WOT pulls hard in all gears except for a small stumbling in upper RPM range
1/4 throttle 1/2 throttle and WOT it runs great. Doesn't seem like a jetting issue

Any Ideas? Maybe something electrical? CDI is new

03-19-2017, 10:34 PM	#1
TheGageinator Join Date: Jun 2014 Posts: 142	Stumble at RPM I have a strange problem going on with my 2007 163fml (200cc) engine. It slightly stumbles at a certain RPM. From WOT it pulls hard until about 3/4 of Max RPM, it stumbles a little until the rpms go higher, then it clears up and pulls hard again to redline. It does the same on all 4 gears. WOT pulls hard in all gears except for a small stumbling in upper RPM range 1/4 throttle 1/2 throttle and WOT it runs great. Doesn't seem like a jetting issue Any Ideas? Maybe something electrical? CDI is new
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