Re: Re: Re: Re: Continuing missing F-20 engine sag

Posted by Pete L on December 14, 2003 at 20:16:44 from (24.236.157.238):

In Reply to: Re: Re: Re: Continuing missing F-20 engine saga posted by Bill Smith on December 12, 2003 at 18:10:47:

Bill - - Thanks for the input. I do know that my spark timing is right, as I time it off the presence of the piston. I am getting a spark thru the wire, as I've checked it with an inductive timing light and get a very rythmic light, both advanced and retarded. Had a couple different sets of plugs (both Champion and now AC). All plugs appear the same when removed for inspection after several hours on the engine. I have disconnected the govenor from the carb and held the butterfly rock solid, (not a good thing to do while the engine is running....thought the engine was going to take off to the moon till I got my hands on the butterfly link) and different speeds. No effect on the missing problem. I think I have ruled out the actual carb and mag, as both were swapped out from good running tractors with no impact. I just can't figure out what changes within the engine as the spark advances that would make the engine miss. The cylinders that do fire are firing more smoothly, as an advanced running engine should. Its just that some cylinders decide to randomly rest while the spark is advanced. What's your thoughts now ? Thanx ! !

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