broken flywheel fix

[chrisdoc0608]

i got bored and decided to try and fix this expensive riva flywheel i had laying around with a broken ring gear or what ever you call the teeth. i first drilled out two holes equal distance apart from their center point then tapped the holes followed by a helicoil, tomorrow i am putting in the stainless bolts with epoxy and then grinding them down smooth with the surface. let me know what you guys think about the fix or was it just a waste of time... the ring no longer budges at all, everything is extremely tight so i think its good to go.

 

[ChrisGooch]

I personally wouldn't use it. It may be fine for a while, but it will eventually let go, and when it does you will have even more damage. If you dont mind inspecting it every couple of rides or so you might be able to get away with it....

edit: I also dont know how your mods would affect the balance of the flywheel... the more I think about it the less inclined I would be to use it

take my advice with a grain of salt... I managed to strip 3 fpp manifold holes, and break a flywheel bolt off into a brand new crank in the span of 2 days....

 

[chrisdoc0608]

but my question is if it were to let go, would it not just spin the ring agian? i just dont think that there will be enough torque to break both the stainless bolts out of the holes, or for that matter it would have to tear the bolt through the flywheel or through the ring gear i mean the woodruf key is not nearly as large of a surface area and i have not had one shear although i know they will. someone on here showed me a flywheel that they did similar to this a few months ago, i wonder how its holding up. and as for the balance, i agree but i measured center point to center point before i cut and i also measured the depth of the cuts so i would say that it is pretty close, i spun it on a rod and it seemed to be pretty well ballanced ( it never stoped on the same spot, i would assume if it was off one side would be more inclined to rest on the underside while the lighter would spin to the top... i hope i explained that ok lol)

 

[Ericfox]

I would run it after that fix... it seems like it is a solid repair... but I am no expert. Just by looking at it though and imagining it working- it seems good to me....

I swear I saw someone else on the site here fix one similar to that...

I dont know how exact they have to be balanced to run good...

 

[Endo]

Never done a repair like that but i would say run it. Looks solid. Now if it were on a high dollar RACE motor I would be concerned but for a normal rec motor....why not. I might be inclined to check it after the first few runs though.