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'93 Johnson. Joe Reeves Method, NO RUBBER STOP

D

DonaldDuck

New member
I've looked everywhere for the rubber stop on the "full spark advance stop screw". Can't find it. Also the timer base has a good bit of travel after the throttle is moved to full open. I wired the timer base as far as it would go and continued the timing sequence. Initially the timing was about 20 degree. I adjusted it to 24 (manual calls for 28).

It worries me that I might be missing something. By the way this is a TJ90TLETS.

Any advise will be appreciated. Thanks
 
1993 90hp Johnson

That model at the dull spark advance timing simply has the vertical slotted arm holding the timer base in place. The flywheel magnets, when the engine is running, is forcing the timer base linkage back solidly against that slotted linkage. It DOES NOT incorporate the timer base stop screw.

By pulling the timer base further and wiring it as one would do with a engine that has the timer base stop screw, you are advancing the timing further than it should be. As such, you are setting up a pre-ignition condition which will actually result in at least one melted piston!

Redo that procedure having the engine at full throttle/full spark advance position via the vertical slotted arm but DO NOT try to advance the timer base any further than what the slotted arm takes it to.
 
You can't believe how much I appreciate your answer. I have looked at this until my eyes were crossing. I'll redo tomorrow if rain stops.

This engine runs good at higher speeds but doesn't idle right. I've rebuilt both carbs and done tune up/sync up to this point. I'm home free now.

Thanks again.
 
Hey Joe,
Rain finally let up so was able to get back to the timing. Still have a question. Do I continue with the Joe Reeves Method of timing from the point that you left? Or will I have to do the conventional method for full advance timing?
 
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