Gas/Oil mixture for rm 80

[rmracer]

I recently bought a 1998 rm 80 and I do not know what ratio to mix the gas :yikes: . The manual say's 20:1 but the person I bought it from told me it was 40:1. Also, I took the spark plug out and it is a BR9ES. In the manual it say's to use a BR10ES. The color on the BR9ES is a light tan which I think is normal.Could this hotter plug be because of rich jetting or what? Also,should I run regular pump gas or premium?Thanks for reading.

 

[Chili]

There will be plenty of folks who will tell you that 40:1 is no problem. I prefer to keep the 80's and 125's at no less than 32:1. Depending on how hard the previous owner was riding the bike they may have required a hotter plug to keep it from fouling.

 

[Mikey350D]

The CR's come stock with a 10 (plug). Much too cold for my son's riding style. We run 9's inthe summer (big tracks & more WOT) ) and sometimes 8's in the winter.

Mikey350D

 

[oldguy]

RMRACER please do not start a new thread with the same question. Look at your origonal one for the answers you have 2 good ones right here

 

[jolyn]

i run 50:1 in my bike.. but im sure the richer the ratio the longer the piston will last..