Jetting Question / Advice ?

[spike444]

I have a 1984 RM 250 completely restored for Vintage racing. The mods include a DG exhaust, Boyseen reeds and a mild porting job. I upped the main jet from 320 to 340, upped the pilot from 50 to 65 and lowered the clip on the needle one position to richen everything up a little to be on the safe side. The bike will only drive with the choke on and will not take full throttle as it just bogs right out if you increase the throttle too much. It seems to be starving for gas! Should I keep increasing the pilot? Should I put the clip on the bottom position of the needle. I feel that I don't need to increase the main jet as like I said before it won't take full throttle. Any help would be much appreciated.

Thanks
:cool:

 

[IndyMX]

Are you sure it's not a RICH bog?

 

[spike444]

Are you sure it's not a RICH bog?

I might agree with you except for the fact the bike only wants to run with the choke on which leads me to believe that it is starving for fuel or in need of larger jets.

Thanks

 

[IndyMX]

could be that the pilot circuit is lean, but the main is rich..