On my 53 it seems to be loading up on the low end. The high end if turned 3 clicks either way the engine will die. If I turn out the low end more than 1/8 of a turn it dies on transition. If I turn in the regulator screw 1/8 of a turn, I lose all transition. Right now it's running just ok but if I fly at low speed very long it wants to bog down when I throttle up.
I'm using an OS F plug, running 20/20, and a fuel filter on the intake side.
Got any suggestions??

Some of the 53's had these problems. It could actually be the piston causing this. We have a modification for the piston which will fix this issue, but you will have to return the engine to our service dept. to get it done. It's not something you can do on your own.

YS Service
1295-C Industrial Court
Gardnerville, NV 89410

Phone:775-782-4562

Thanks Dave, it will go out Monday by fedX. How long will it take?

The service dept is busy at this time of the year, and with the holiday next week, it could take a couple of weeks.

Dave