I had the same thing happen to my 170 at the Dist 2 championships,...I went into panic mode (first YS since the 90's) and sought out an experienced YS guy,...stuck valve. I did the same thing Bryan suggested before we fired it up again. We fired it up,..ran it,..shut it off and all was well again. Mine had about 10-20 flights on it before that happened. The prior weekend the engine backfired when I was running the fuel out of it,..more than likely that caused my problem,..now using the foam clunk and a different tank that the clunk would fit in.

I will say,...when my 170 was new,...I had nothing that would turn the motor over,..had to rigg up an attachment for the 24 volt cordless drill (dynatron would turn it over well enought on a car battery) and flip the plane over. I had one full tank of fuel through it,..running very rich at a high idle and no more than 1/4 throttle. The second tank,...I started working with the transition a little and snapped the piston rod at 1/2 throttle. Rich fixed it and broke the engine in before he sent it back,....magic,..the Hangar 9 starter for the 180 sized engines turns the bah-gezzies out of it now. I was informed on my next one, 2 tanks at idle and no horse'in with the throttle at all.

Just thought I'd share my experience with my 170 with you.


Best Regards,
Bill Holsten
Team Fliton