Just recently obtained a new TH 46. Broke the engine upright with several tank fulls of fuel following the manual. Did not make any adjustments to the carb needle. Installed the engine in a Seagull Spacewalker II. It sits 45 degrees away from inverted or at 135 degrees. Now I am having problems with the engine not wanting to maintain full power. It will eventually die and not restart until it cools off. I noticed that the carb needle by the manual should be open at least 2mm but mine is not even close to 2mm. Last night, I opened the needle to the 2mm point and test ran on the plane on the ground. It seemed to perk up even more on the high end but would not idle at all. I progressively closed the needle valve and the idle progressively got better and the high end needle setting got progressively worse. Until I reached the point where it would not run at full throttle anymore nor would it start unless at idle. It would start at idle but die out as soon as throttle was advanced.

Does anyone have any suggestions?


Thanks
Jim

Sounds like you have it well out of whack. Reset the high speed needle valve for max RPM then richen it (counter clock wise a 1/4 turn). Then idle it down, use a very small screw driver - 3/32 of an inch -- and insert it on the other side of the carb from the high speed needle valve (do this adjustment with the engine stopped for safety purposes). This is the low speed adjustment screw (the low speed setting determines the idle and transition to high RPMs). It sounds as though this is all the way in or near all the way in. Unscrew it at an 1/8 of a turn at a time, gradually richen the idle setting. Run and test. Keep at it until you get a good idle and a good transition. You may have to reset the high speed needle after just a 1/4 turn or so of the low speed adjustment. You are looking for the right balance. Take your time and work at it. It will come around for you.

Cheers,

Chip

Thanks Chip.

Actually, that was the way it was when I got it. I have now opened the needle back up to 2mm or 3/32 and will start over trying to keep the low end as rich as possible.

I must say that the customer assistance at Hobbico has been outstanding. I e-mailed them with this problem as well and recieved an answer back within the hour. They gave me the same answer as Chip. I e-mailed them back with another question and once again got an answer back within the hour. To me that is outstanding service. Kudos.


Jim