RM 250 carb jetting?

[dwarf66]

I am looking for the jetting that anyone is running on a 77/78 RM250. Main and Pilot. Thanks
Marc

 

[wirefryer#85]

Hi Marc.

While I run an '81' it is pretty much the same engine as yours.

Elevation here is around 1500' ASL or so.

Main Jet; book calls for a 320, I run a 280 with the clip in the 2nd groove from the top. I dropped to a 270 a while back trying to get a plug fouling problem under control but that turned out to be a weak ignition issue.

Pilot jet; book calls for a 45, I was running it but dropped to a 40 to clean up the bottom a bit.

Airscrew; book calls for 1 and half turns out, I run 2 turns out.

Hope this helps!