Motorcycle Repair: honda 1979 xr 185, jet needle, valve clearances

Question
what are the settings for the screw under the bowl for the carb on the xr 185, thank you

Answer
Bill,

XR185s with the PD31A carburetor have the following settings:
Float level: 12.5mm
#115 main jet
#35 slow (idle jet)
Needle clip in the 4th notch down from the top
Idle mixture screw turned out 2 3/8
Idle speed 1300 +- 100 rpm.

Make sure that you have good valve clearances (.002") on In/Ex, with compression readings about 175psi-200psi

Because of the alcohol in today's fuels, you may have to install a slightly larger main jet to recover lost performance.  Specs are basically sea-level settings.

Bill Silver