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View Full Version : OS 91 SZH questions / set up info needed


noste500
06-28-2008, 04:53 PM
I am running the above motor , ( pumped )
Reading various posts , it would seem that some guys run the mid needle fully closed,
Is this just for the pumped version??

Is it just a case of closing the mid needle and tuning the main needle down bit by bit from fully rich?


My motor is broken in and I am tuning it now. Seems really fat in the mid range though.

Also, is it the best set-up to use muffler pressure to the tank?

Cheers