Re: Re: Full throttle issues

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#64750
Derrick Rendon
Participant

@Rodney Ebersole wrote:

My first thought is it’s too rich. When too lean at full throttle generally it will rev well till it sticks the piston. Plus I remember running main jets in the 150’s- 160’s range. Reading the plug and piston top after running it in the poor full throttle condition might confirm rich or lean. Or put in a richer jet and see if the condition happens even sooner in the rpm band.

for weather this cold i would not expect anyone would be running a jet that small. but hey thats the kind of info i was looking for. the problem with reading the plug is that itwould not be accurate at this temperature. the plug could read rich but its not actually running rich as it explains in this article
http://srsengines.com/technical-library/shifter-kart-engines/honda-cr125-cold-weather-jetting
im starting to lean more towards the fuel pumps now, but ill check it all out tomorrow at the track. hopefully its just a matter of changing the main jet or rebuilding the fuel pump.
@[email protected] wrote:

My mistake, Derrick, I missed your “no matter what RPM I’m at” quote…. it does sound more like fuel.

We have nothing but great shops in Colorado if you need help.

I never ran a shifter, so no thoughts on jetting.

oh no problem, thanks for the input though!