Just bought a GP Big Stik .60 with a YS 91 on it. I think it's an FZ, but am not too sure. The crankcase states " YS F-91AC". If anyone has a PDF of the owners/operators manual for this engine, it would be a great help. My email address is [email protected]

Thanks a bunch!

The .91FZ and AC are very similar. The FZ had the larger carb and the newer needle valve. If you have the chrome (and larger) needle then you have an AC for sure, if you have the updated needle the carb would be the give away, but without seeing both it's hard to tell. I'll email you the PDF shortly.

jskids.

i will send it to your email

Guys, thanks for the help. Got both of the manuals. Got the motor running great.

Maidened the stik today, the FZ is an absolute blast on this plane with rock solid reliability and enough power for near unlimited vertical.

I have the same motor, no manual. Any way you could email me the pdf manual?

[email protected]

Thanks

i removed the scanned copy off my hard drive after i mailded it out the last time. Okay here is one better for all in the future all YS manauls

http://www.geistware.com/rcmodeling/files/ys91st.pdf

the other YS engines

http://www.geistware.com/rcmodeling/...ys_engines.htm