Posted by Mark1031 on August 11, 2018 at 20:29:01 from (74.83.25.28):
My MF135 Perkins engine is running awful. I drained the fuel tank, cleaned the carburetor, replaced the fuel filter, clean the sediment bowl and screen, changed the plugs, changed the points and condenser, replaced the plug wires, changed the distributor cap and rotor. I checked to compression by putting my thumb over the spark plug hole and all cylinders blow my finger off with force as i crank the tractor.
The only way it run smooth is by running on full choke at full engine rpm and feathering the choke in and out to keep it going. This works with the tractor stopped or driving it. It seems to backfire a little (air coming back thru thru the air filter. It does not stall out, just misses, and lacks power when the engine misses.
Some more details. It starts easy, seems to be missing on one cylinder, sometimes 2 at startup, then the miss comes and goes. Ay times only runs on one cylinder. Cylinder 1 seems to be firing hot, the plug porcelain is white!! Cylinder 2 and 3 are sooty looking. I changed the plugs a second time purchasing Autolite plugs they recommended. I gapped them at .025", points gaped at .022".
I reallyy need some help figuring this one out. Because it runs good with a full choke being feathered in and out it does not seem like a valve problem. Do you think it is a compression/vave issue.
The tractor does not burn oil. The tractor sat in the barn, dry and was not used for 1-1/2 years. When I fired it up after sitting this long it ran great for 2-3 minutes. Then I drove it out of the barn, it started to miss, and it has not run smooth ever since (unless the choke is feathered.)
Has anyone had problems like this on their MF135 3-cylinder Perkins tractor? I NEED HELP!!! Mark1031
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