Hello all, I'm having a slight issue with my Eldorada. It has a vx .18 and recently Ive been having issue with overheating. The temps are running 350-400 degrees. It doesnt matter how far out I put the HSN (I can turn it into a misquito fogger) it doesnt matter. The engine is running very strong. After about two laps around the yard I have to let it sit and idle to bring the temp down. I have checked for air leaks. Found one at the carb base, and sealed it. No change. The fuel Im running is Trinity Monster Horsepower 20% with 12% synthetic oil.

Tonight I change needle settings back to factory. Ran same temps, but bogged in mid range. Take off strong and top end strong untill heated up then lost top end till cooled down. When this started it also started burning out my plugs (mcoy mc-69) never had any problems before. I check the coil in the plug and it is not pitted or black, it still has its silverish color(the pic of the plug has a tank ran thru 1/2 of which was very rich settings and other half factory settings). I have taken carb apart to check for any debri stuck in needles, nothing. I have also noticed that the throttle arm moves in and out a little. I understand it moving in and out when opening and closing. But it also does it stationary. And when I adjusted the LSN tonight I noticed a drastic change when putting a little pressure inwards on the needle when adjusting, it was like shutting the needle almost all the way down. The rpms shot way up, and when pushed back out it settled back down. Never noticed it doing that before tonight, and I have adjusted LSN plenty of times while running.

The changes I have made are a 15 tooth bell (which I thought thats when it all started, so tonight I put stock back on-no change), and have replace the stock manifold with a header (including pics). Before putting stock manifold back on, I wanted to get more opinions on what it could be (your up Eddie and friends).

Hope this is enough info to get started. Thanks in advance.