Hi Dave,

I had trouble fine tune my 61AR idling spped after replace with a new diaphram.

I had the regulator adjust to a position that both high ( with high needle valve adjusted ) and idling seems to be fine while the plane is siting on the ground. However, when I raise up the nose of the plane while idling, the rpm drop right away and engine stops. I asume it is too lean and strat screwing out the regulator screw (1/8 turn each time). The problem seems to improve slowly. Therefore, I keep screw out the regulator to a point that I almost believe it can be too rick. However, I can only keep the engine idling for less than 6 seconds at the nose up position ( vertical).

Do I do it right? What should I do?

Thanks very much

Mike

Plug? Fuel?

plug: Temporary using tower hobbies tower plug.
Fuel: Cool power 20% heli

Mike

Try an OS #8 and see if it fixes the problem.

I will go get the plug and let you know the results.
Thanks

Mike

I test the engine today with the new OS #8 plug. It helps starting the engine, but the problem is still the same.
I endup almost screw out the whole regulator. I worry that there is a pressure (air) leak in the regulator. As long as I have more than 1/4 throttle, the iddling won't stop at 90 degree position.
I check the O-ring, it seems still ok. I am thinking getting a new one,but I am not sure if that is the cause.
The engine is old and the O-ring is old.

Or,I was wrong that I shouldl lean the regulator ?

Appreciate your help!
Thanks

Mike

I would start by replacing all the gaskets, o-rings and regulator parts. Then completely change all the lines from the tank to the engine. Make sure the check valve is working OK.

Problem solved. Replace the rubber plunger which loose the flexibility, both gaskets and one o-ring for the the needle valve .
It is running great now.

Thanks for the help.

Mike

Great!

Good Flying!