Hi Andy,

First I should let you know that I fly with 15 percent nitro and always have some castrol in the fuel - what nitro are you running? If its lower, you may have to play with the head gaskets, however, I have never done this.

Whenever we have an exceptional cold day, and the engine is running too cold to be reliable, you can keep the engine running warmer by putting a strip of aluminum cooking foil around the bottom 1/3 or 1/2 (sometimes more) fins of the motor. Hold in place with a twist tie.

I understand that your mid throttle problem first appeared when you tried to hover. Since fuel draw is more difficult in the nose up attitude, we still may have a fuel draw or pressure problem.

I can not remember, and can not seem to find it in this thread, so I need to ask, did you ever drill the intake fuel nipple and exhaust pressure nipple, if so, to what size?

I drilled mine out one drill size larger, then the engine started to work. I may drill the nipples out two drill sizes larger and give it a try, it won't hurt and may be best for a standard fix. The brass insert on mine has already been drilled so the opening is directly below the fuel intake nipple with the insert fully seated, so this does not need to be done.

Again, your doing a lot of work trying to solve this problem. Thanks for your help and keeping everyone up to date.

Fly4Fun,

Wayne