Hurridriver

My Feedback: (2)

I recently sent my OS 1.20 FS pumped in to replace the pump and regulator. It now starts easily and throttles up well. After about 1 minute or less at wide open throttle, the motor sags and eventually dies. I have replaced the glo plug, checked the tank and lines, applied full time glo power and nothing seems to keep it from dying. Any ideas? The engine only has about 100 flights on it and has run very well in the past before I had to replace the pump.

Thanks
Jeff

C185Pilot

My Feedback: (25)

Is the fuel tank vent open to outside ambient air?

Hurridriver

My Feedback: (2)

I have never used muffler pressure. Should not be a factor. I am wondering if I have a heat/ expansion loss of compression. I may have a worn piston ring - the engine runs perfectly cold, but it seems to change when it gets hot. Any thoughts?

Thanks
Jeff

checkmate91

You wore it out?

jimcork1

My Feedback: (4)

If you have the pump , the pump is not working properly.

My last OS 1.2 pump was my last OS after all the $$ I spent at OS. Finally I got them to switch the 1.2 pump engine out for a 1.2
w/0 pump and it has worked exceptional. Too bad I spent so much $$ on the pump.

This was the reason I switched to Saito.