Rear sprocket bolts??
Posted September 07, 2004 - 04:16 AM
After the first time, I replaced all the bolts with new locking nuts and bolts. I tightened them as tight as I thought was wise.
I'm going to replace the stock sprocket with a new sprocket, probably Renthal, buy new bolts, tighten them, and see what happens.
Has anyone had this problem and solved it??
Posted September 07, 2004 - 04:56 AM
Are the holes in the hub ok(not round wollowed out)Seems like most of the problems like this are related to bad hubs!
Hope this is not the case with yours! Good luck!!
Posted September 07, 2004 - 05:51 AM
I have had 2 failures in the past. A couple of buddies have also. Here is what we brain stormed on the issue
When the bolts become loose they get strectched by the pounding. Once Stretched you can never keep them tight. If you torq them and locktite them the metal is still fatigued and the bolts will stretch further and eventually cause a failure.
Soon as find loose bolts I replace them, set them up with locktite, and torq them to proper specs (over tighening can be bad too). I have not had a failure since doing this (knock on wood).
Since you had replaced the bolts I would look at locktiting and proper torq. But before that I would make sure your hub holes are not elongated. That would allow the movement to stress the bolts.
Posted September 07, 2004 - 05:55 AM
Posted September 08, 2004 - 02:44 AM
I installed a new JT steel sprocket at the beginning of this year. It came loose once and I retorqued all the bolts. Then on the mx track the sprocket got torn away from the hub without any warning. I had to replace the rear sprocket/hub and have the wheel relaced. I also had to buy new bolts. I had to pay near $60.00cdn from my local friendly Yamaha "stealer" for these bolts .
From the good inputs I received from this board, I torqued the bolts at 25 ft/lbs with blue loctite.
So far so good.
Posted September 08, 2004 - 04:52 AM
wheel. The parts guy said that someone had just come in and bought all the sprocket bolts.
They called Rocky Mountain to see if they had the bolts and they were sold out also.
I see a pattern.
Posted September 09, 2004 - 02:39 PM