2LikesEngine Revs Up With Throttle Closed
10-08-2023 | 08:29 AM
#1
Tech Rookie
Joined: Aug 2023
Posts: 12
From: Colorado
Definitely sounds like an air leak or a pinhole in the fuel or pressure line. Anytime you suspect and air leak it’s good practice to reseal the back plate and carb. It can also leak air through the front bearing, there will be oil residue around the flywheel area if it is. I would also replace the fuel line and pressure line. I have had fuel line with pinholes before that you couldn’t see.
12-10-2023 | 01:50 AM
#3
Hi, I have a Traxxax T-Max 3.3 that I cannot get tuned. On the bench after starting, the motor will rev up with the throttle closed. I have to pinch the fuel line to shut it off. When I can tune it to idle somewhat, the motor will run for a minute or so then die. The carb is set to factor settings. I removed the carb, cleaned it and replaced all the o-rings. I did find some debris in the main jet. None of the carb work changed anything. Suspecting an air leak, I removed the motor and tested for air leaks. I found none on the motor. I did notice a small amount of air leaking from the bellows on the throttle slide on the carb. Compression feels good when turning the motor over by hand. Any suggestions on what to look at next? Thanks in advance.
Make sure carb is fully seated into the block. Check for leaks around the carb, under the front of the engine, the rear of the engine and on the exhaust. If none of this
is occuring, try a different known working carb on it and a new glow plug. make sure your filter is clean too.
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