Flywheel all kinds of boned 1987 200hp

archcycle

Chief Petty Officer
Joined
Sep 21, 2009
Messages
647
1987 E200TXCUC that I picked up cheap a while back and never really got around do doing much on

I'm troubleshooting no spark on this motor (true factory service manual) and have run into two two likely cuplrits. The PO bought this thing non-sparking for the hull that it came attached to. He swapped the stator with a used one, and with still no spark he liquidated it.

Everything tested good for me back to the stator, which had no readings.

Issue #1:
I removed the flywheel and found that one magnet had come loose and was spun up against another and it had cracked in two cleanly. I tapped on all of them and 2 more came right off. Cleaned everything off with a wire brush and epoxied them all back in place.

Issue #2:
It appears that when the PO put it back together he may not have been aware of the flywheel key. A chunk of it was still in the keyway on the crankshaft and some light surface rust on the flywheel side of the keyway makes it appear that there hasn't been anything in contact in there for a while (at least the year and a half or so since I bought it..). My assumption is he dropped the flywheel onto the crankshaft and just banged it down with an air gun and it sheared the key off clean. The keyway appears to be undamaged.


Question #1:
Would having one magnet not in place cause no spark, or would it just cause erratic spark/impossible timing and is it going to matter to the fields this creates than one magnet is broken in two?

Question #2:
The flywheel was tightly torqued down and spinning though no thanks to the key I'm sure. Would the flywheel not being properly keyed to the crankshaft cause no spark or just erratic spark/impossible timing?


The powerhead disassembly section of the manual doesn't make any mention of this. In hindsight perhaps it is in the ignition section but I don't have the manual with me at work.
I'm going to pick up a new key today.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,931
Re: Flywheel all kinds of boned 1987 200hp

Would having one magnet not in place cause no spark,
No.....
Would the flywheel not being properly keyed to the crankshaft cause no spark or just erratic spark
erratic spark/impossible timing....
 

boobie

Supreme Mariner
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Nov 5, 2009
Messages
20,826
Re: Flywheel all kinds of boned 1987 200hp

Agree + 1...........
 

archcycle

Chief Petty Officer
Joined
Sep 21, 2009
Messages
647
Re: Flywheel all kinds of boned 1987 200hp

Then it's stator time. Thanks both
 

bakerjw

Petty Officer 1st Class
Joined
Apr 3, 2013
Messages
288
Re: Flywheel all kinds of boned 1987 200hp

Many year ago my dad had an 18 horse Johnson that had problems with the flywheel shearing off the key. It was solved by making a tapered shim out of an aluminum can. The shim took up enough space for the nut to full press the flywheel onto the taper on the crank. Not sure if you'll run into that issue or not but if the flywheel has been spinning with a piece of the key in there, you might not get enough contact between the surface areas.
 
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