I have this engine for about 10 months. I initially had it mounted on a World Model P-51 and ran it for about few times until it dead stick on me and subsequently crashed my P-51. After the crash, I just left it along until yesterday when I put it on a test stand and try to start it again. After I fuel it up, it started with just couple of turns. It ran at a very high RPM. I check the throttle and it was at quarter open. I was somewhat surprised on why it ran so hot with so little throttle opening. When I closed the throttle, it did not kill the engine. The engine ran consistently at about 4,000 RPM. When I open to 1/8 throttle, the engine hesitated and I could feel the fuel spread out of the carburetor, the RPM dropped to 3,000 and picked up to about 6,000 RPM. I could see big bubbles in the fuel line between the fuel pump and the carburetor. The only way I could kill the engine is to pinch the fuel line and that took about 30 second before it die on me.

I had been flying for about a year now. I own OS, Revolution, Zenoah, ASP and 3 YS engines and never had this happen.

Your input is greatly appreciated.

Gary

The engine is leaking somewhere in the crankcase, probably due to the crash.

It needs to come in for service. Send to:

YS Service
1370 Porter Drive
Minden, NV 89423

Phone: 775-267-9252

Be sure to include a letter detailing the problem, and ASK FOR AN ESTIMATE BEFORE REPAIRING. Include your daytime phone number.