Hi all
I just purchased a old pt40 trainer with a osmax40fp in it, was very dirty and took some cleaning just to get engine to turn over, i intaled a remote needle with new carb and i am having trouble tunng it , (this is my first gas) had 10% fuel now using 15% questions are
4 turns out to get started is what mine requires ???
idle mixture is about 3 or more turns out ??
having a problem though when i taxi and turn around and give it throttle (slow or quick) it will rev for a bit then just die
prefer to get this running good b4 i put in air
fair amount of fuel or oil coming from prop shaft??
thanks in advance
bansheeman

The key word was "old". Your engine may be worn out. You also may want to install the stock carburetor and see how it run with that. Your problem may also be the carburetor you chose to use. The O.S. Max .40 FP did not originally come with a remote needle, so changing the carb may be the source of your difficulty, although the carb used on the .40 LA with remote needle should work nicely, too.

Since you didn't mention which carb you actually did put on the engine, we'd be able to offer no advice on it.

One thing to try is to mount the engine on a test fixture and run it there. That gets everything in the open and you can easily monitor the fuel system, prop, and engine at a comfortable working location.

thanks for your reply
looks like i took a 3c carb off and put a 40 on as best i can red
should i put old one one leaving needle out 4 turns and use remote needle for adjustment??
engine seems to have geat power i just got used to electric and need to make sure its not going to die in flight
thanks again
bansheeman

Using the stock carb with the needle at 4 turns out and having another remote needle will work quite nicely. It's been done with a lot of other engines for years and years.