Posted by gbs on March 23, 2021 at 20:01:25 from (71.217.169.122):
In Reply to: Another Onan question posted by jon f mn on March 23, 2021 at 16:50:48:
if your ign is controlled from a magnet on the flywheel check to see that it didn't shear the flywheel key as that will throw the timing off, next check the compression, even if it is good check the valve clearance as some engines run a tight tolerance to accommodate a compression release for starting, had rocker arm crack on a Briggs and it was doing as you describe it was allowing to much valve lash. if all checks good or is known good then start testing the electronic ign system, if your has an ign module i have seen those on other engines intermittently fail and just about run a person fool trying to locate the problem and the cost of some of those modules is ridiculous, i have seen 2 honda 4 wheeler modules with the wiring changed to bypass some internal part of the module due to the part cost and availability that ran as good as a new one, a bad low oil sensor, ign switch ect. can also be part of the problem. but if has an ign module i would suspect that from what you describe.
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