flywheel trouble

[Tony]

Yesterday i was riding my mini bike when it lost power. I took off the shroud and turned the flywheel by hand. As the magnet passed under the magneto they touched each other. What does this mean? Is it a sheared key? Also the magnet looks like it screws in to the flywheel it isn't built in to it.
thanks Tony

 

[Kaptain Krunch]

You need to gap your magneto, get a set of feeler gauges if you dont have them already, your manual should have specs for what the proper gap should be. You key may be sheared but i doubt it, you can check if you want but that wouldnt cause the magnet to hit the magneto.

 

[Tony]

Only part of the magnet hits it, not the whole thing. I don't think the gap would mess up all of a sudden would it?

 

[Kaptain Krunch]

could have? it should not be touching at all. Are the bolts on the magneto or magnet loose?

 

[Affair_driven]

Gap is .0125".

I don't think the gap would mess up all of a sudden would it?

Yes it does, and you have the proof.
Make sure it's torqued to spec.

 

[Tony]

dont have the manual so i will just tighten it till it is tight

 

[down_in_flames]

i have alwase used a business card to gap the magneto and ive had no problems

 

[Affair_driven]

Wrong thickness can cause timing problems.
Invest in a thickness gauge set. Cheap enough and will last forever and is much more professional.
They are used for much more than setting mags.
Ring gaps, points, valve adjust, etc.