I bought my bike off of a friend that blow it up. There was a hole the size of a bottle cap just under the crank and there was tranny fluid coming out of it, so that wasent good. after tearing the topend off we found out what had happend. the bottem half intake side of the piston had broke off and when it fell into the bottom of the motor the crank forced it through the case. aswell as busting a crack through the tranny side of the case. the crank bearings were all good. i dont have any pictures of the hole but i do have some of our fix for it. 2 packs of JB Weld and alittle bit of fiberglass. we used asetone and a file to rough it up before applying.
left side case
right side
The case can now be repulled apart if needed to, the way we did it was by sealing the cases togeather and using electrical tape between them, then build our jb up in layers on each sides of it. after pulling the cases and tape off minor touchups are needed to make sure it seals after. aswell as fileing was needed to be done on the inside to make sure the crank will still pass it.
This dos look abit sketchy and if applyed wrong can be problem prone. but after installing a new piston/bore this motor runs like a top. i have been running this bottom end in my bike since and havnt had a problem with it. i also did an air leak test on the motor a year after this fix and still held air fine.
lol and yes This is rigging it up at its finest
left side case
right side
The case can now be repulled apart if needed to, the way we did it was by sealing the cases togeather and using electrical tape between them, then build our jb up in layers on each sides of it. after pulling the cases and tape off minor touchups are needed to make sure it seals after. aswell as fileing was needed to be done on the inside to make sure the crank will still pass it.
This dos look abit sketchy and if applyed wrong can be problem prone. but after installing a new piston/bore this motor runs like a top. i have been running this bottom end in my bike since and havnt had a problem with it. i also did an air leak test on the motor a year after this fix and still held air fine.
lol and yes This is rigging it up at its finest