PW50 running too rich - help!

Joined
Sep 10, 2007
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#1
My son's 200 PW50 starts easily, won't run crisply or clear out at full throttle, and the plug is fouled. It is completely stock as far as I can tell (but the restricting exhaust washer has been removed).
Any suggestions/ideas?
Thanks,
Rob
 
Joined
Aug 21, 2005
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#2
Go one size leaner on the main (stock is a 70, go to 67.5) and tune the pilot first. The PW50 is rich from the factory, and tends to be abnormally affected by the screw even at the top end.
 
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Sep 10, 2007
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#3
Thanks!

I'll try changing the jet. Also, do you know if there is a way to adjust the 2 stroke oil injection?
Thanks,
Rob
 
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#4
You can, but you need a dial indicator to measure the stroke of the pump.

Basically, you need to remove the cover, mount the indicator in a very stable location in line with the plunger, and adjust the stroke with a wrench while the engine is running. The exhaust will probably be in the way as well. You can get a Clymer manual for the bike for around $30 that tells you how to do that, and a lot more.