Posted by docmirror on November 04, 2022 at 18:32:47 from (23.127.217.254):
I'm having a hard time diagnosing this. The tractor ran fine for weeks. Then, it began to pop out the exhaust and sputter and backfire.
I've cleaned the carb and adjusted it perfectly and it runs on an 860 I have, so the carb setup is ok. I replaced the 6V coil with a new 6V coil and no change. The wires and plugs are clean, the points are set to the factory gap.
Here's what I'm wondering and if I can test for this. Is it possible for the cam timing to jump? The engine will crank and almost start but it pops out the carb. It will not stay running, despite the carb and ignition being good. Last thing I can think of is an off timed cam.
Is it a chain driven cam, and if so, does the chain ever jump on this 172CI engine? Is there a way to check the cam to crank timing without removing the front of the engine(I have a loader on this)?
It ran great for more than a year, then it just started popping and backfiring while brush hogging.
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