Is this flywheel key bad enough to cause rough running?

P

PeteAU

Forum Newbie
Hi LawnWorld,

The title says it all really. Is this bad enough to cause rough running, e.g. some pops/crackles in the exhaust, hunting idle and sometimes kickback in the starter cord?

I've already cleaned the carby and tried 3 different (used) spark plugs, so I guess this is it. The flywheel ain't budging though (can't get it off yet)...
 

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Very minor offset results in major timing changes. I wouldn't be surprised if that amount of offset advances the timing 5 degrees. So instead of firing at 13 degrees BTDC it is now firing at 18-20 degrees BTDC
 
ILENGINE said:
Very minor offset results in major timing changes. I wouldn't be surprised if that amount of offset advances the timing 5 degrees. So instead of firing at 13 degrees BTDC it is now firing at 18-20 degrees BTDC
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Perfect, thanks. Now I know this needs fixing to get it running right.

Fish said:
What is your problem removing it? What method are you using?
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I've tried prying while hitting the nut/shaft with a hammer. Tried gentle hitting from underneath. Tried heating it with a heat-gun (paint stripper). Reluctant to really hit it hard, I realize it's aluminium.
Next I might try tapping M8 threads into the two little holes and home-made puller plate.

Fish said:
Is the crankshaft bent on the other side?
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Spinning the blade around, it looks pretty straight.
 
What I use most the flywheels I pull is a harmonic balancer puller. I tighten it up good and tight then smack the forcing screw with a two brass hammer. Shocks it off after a few tighten rounds of the forcing screw.
 
I've tried prying while hitting the nut/shaft with a hammer. Tried gentle hitting from underneath. Tried heating it with a heat-gun (paint stripper). Reluctant to really hit it hard, I realize it's aluminium.
Next I might try tapping M8 threads into the two little holes and home-made puller plate.


the standard Briggs puller uses 1/4-20 self tapping bolts at least in the USA.
 
OK, I got the flywheel off. But now, is this flywheel key way too far damaged? Maybe make/file a custom key that's slightly oversized. What is your experience?
 

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Yes the key is too far damaged. I think i would put a standard key in there and properly torque it and see what happens. The key doesn't keep the flywheel in place it is just for timing alignment, and the proper torque on the flywheel holds it in that location until you hit something that causes the flywheel to not stop when the engine does.
 
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