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Magnetos, Ignition Coils and Spark Plugs Discussion about magnetos, buzz coils, spark plugs, ignitors and low tension coils.

Magnetos, Ignition Coils and Spark Plugs

Briggs & Stratton Flywheel Timing

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Old 06-12-2019, 12:20:44 PM
foxtail foxtail is offline
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Default Briggs & Stratton Flywheel Timing

I tightened a b&s flywheel with an impact tool. Now it’s out of time. What did I screw up? The key is still good. Someone told me the magnets inside the flywheel is causing it, but they look like they haven’t moved. It fires about 1/4 turn too soon. Is there any good news out there? Thank you.
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Old 06-12-2019, 12:52:18 PM
radiodoc radiodoc is offline
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Default Re: Flywheel

A model, type and serial number would help out here. Double check the key. If the engine has points, make sure they are gapped correctly. Guessing twenty thousandths. Others will chime in when they have time.
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Old 06-12-2019, 01:12:27 PM
I like oldstuff I like oldstuff is offline
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Default Re: Flywheel

Is it the correct wheel for the engine? Although it fits, there are differences and since your timing is way off perhaps it may be the case.
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Old 06-13-2019, 02:28:28 AM
cobbadog cobbadog is offline
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Default Re: Flywheel

Sounds as if the wrong flywheel is on the engine. So check the position of the magnets when at TDC.

I do have to ask why did you use an impact wrench to tighten it?

Make and model is a help too as suggested.
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Old 06-13-2019, 11:07:23 AM
Andrew Mackey Andrew Mackey is offline
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Default Re: Briggs & Stratton Flywheel Timing

B&S points set .020". Tightening a flywheel with an impact wrench is a NO-NO! Doing so will cause the crank to swage the taper, possibly splitting the flywheel hub and offsetting the position of the magnets (flywheel warp).

Correct flywheel for the engine? Correct magneto? B&S changed flywheels and mags over the years. At TDC Compression, the second magnet should be just under the following leg of the magneto. For the electronically controlled mags, magnet timing is critical. Check your keyway too. B&S made offset keys for some engines, and if installed wrong, will make timing off.
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