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high idle, runs on 1 cylinder unless slightly choked
Posted: Tue Dec 30, 2014 2:15 am
by corsarod
Hi all, I picked up an 84 540 v max that has sat for quite a while, changed fuel lines and fired up, it appears to run on 1 cylinder and will run on both by slightly choking the 2nd carb. Then idle goes way high til I let choke off. EGT on 1 cylinder is 480 and 100.... could this be filter or idle jet? Appears to have good fuel flow from pump... any ez ideas?
Re: high idle, runs on 1 cylinder unless slightly choked
Posted: Tue Dec 30, 2014 7:28 pm
by Vmax540
Lean conditions such as pugged jets/passage ways/orifices or float settings can cause a high idle. Cracked or loose Carburetor to cylinder mounting flanges and leaking crank case seals which pull in air to lean the mixture can cause a high idle. Look for a hung up or miss adjusted throttle cable. Make sure there is play on the choke cable. Do not try to run this way or a burn down will be the outcome.