2001 Cr 250

[uofacarnutt]

I just recently started to use 110 octance race fuel and I noticed that at low rpms it stumbles and boggs out. Is this due to the spark plug that i am running or something to do with the carb? My current ratio is between 32:1 and 36:1.

 

[Faded]

Originally posted by uofacarnutt
I just recently started to use 110 octance race fuel

This can and will affect your current jetting which would explain your problems. You should look into rejetting for the type of fuel you'll be using and I suggest a consistent premix ratio, i.e. 32:1 or 36:1, not somewhere in between. Good luck.