Hey guys. I recently made a great trade on a tower hobbies tower terror .25 truck.

It has the factory engine seen here:

http://www3.towerhobbies.com/cgi-bin...?&I=LXRCJ6&P=7

The engine itself seems to be mechanically great. Im just having a little bit of a hard time tuning it. I have sealed it up and I am pretty experienced with nitro engines and mechanics in general. I got the truck used obviously, and these engines are known for being finicky, however I enjoy tinkering with these things.

The main thing I cant quite figure out yet, is that it seems like richening the high speed needle plays a big role in how the truck idles. I can get it to idle pretty good, but richening the HSN will richen the bottom end enough that it wont idle. It seems to be pretty finicky about idling. If I could get it to idle consistently, I can tune the top end with no problem. At times it seems to have a bog in the mid range as well. It will jump off the line and about 1/3 through the RPM band it bogs/hesitates and then picks back up. I was getting low on fuel when it did this, but It doesent make sense fully to me why that would cause the mid range to be weak. The engine starts easy even hot and I was running it in 12* weather tonight with no real problems.

The high speed needle has a bad o-ring and ever so slightly leaks fuel past it, but i dont think this would be a big issue. Fuel lines are good and the exhaust is on tight. The engine also has a mid speed needle and I have messed with that some too. It makes a big difference in how the truck runs even just turning it slightly.

Basically the 2 problems I am having are the idle problem, and the bog at WOT in the mid range(which may have only been a low fuel issue?). Anyways, just looking for some ideas or things to try. Thanks