CR250R premix ratio

[prairie-rider800]

Hey Everyone,
I just got a 2001 CR250R not to long ago and I was wondering if anyone knows what would be the best premix ratio for that bike.
Thanks for any advice

 

[slomo]

i use 40:1 with synthetic oil but have ran it as lean as 50:1 with race fuel

 

[Slamnek]

I run my '00 CR 250 at 50:1 all the time on pump gas using Amsoil Dominator. I can scream my bike all day in the sand and i have never had a problem.

 

[prairie-rider800]

okay thanks guys I'm running it at 32:1 right now with amsoil synthetic as well but i think i might lean it out a bit maybe 40:1

 

[Slamnek]

Is your bike stock? Powderchowder has the same bike and he was told by a buddy that raced that year of bike to drop the main jet from a 420 to a 400. That bike comes to rich from factory.

 

[prairie-rider800]

It has an FMF gold series pipe and v-force reeds on it. So i am assuming the jets would have been changed for the pipe.

 

[slomo]

Is your bike stock? Powderchowder has the same bike and he was told by a buddy that raced that year of bike to drop the main jet from a 420 to a 400. That bike comes to rich from factory.

i'm running a 380 in my 01 32.5 pilot and it's running great now and thats with the fmf gold and the turbine core silencer