Help - jetting of si24/24e DR177 stock exhaust


I've just installed a DR 177 and a new si 24/24e at my px125e from 1983.

The engine rund dell bit there are a flat spot of power at about 1/4 throttle.

How do I jet the carb to avoid this?

What jetting are suitable for this tuning?

My jetting at the moment are air corrector 160, diffuser be3 and main 120, idle jet are 55/160.

Grateful for any help!



Hello Andreas,


we think the idlejet you are using is to big.

Please try following itemcode:

You also have to check your ignition timing (19°)


Kind regards

Mario SIP