Checkmate Posted January 24, 2004 Report Share Posted January 24, 2004 i think i have a crank bearing letting loose. i pulled the head and saw some pittin/metal imprinted in the piston, when i took the head off. check these pics out and tell me if you think the pistons are re-usable. the cyl walls look ok. the one dome looks like the piston top. Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 pic 2 Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 this is the junk that is in the bottom. Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 second picture of the junk in the bottom. does this look like a bearing letting go?? Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 plus when i took the clutch cover off i saw some scratches on the basket. where could these come from? if you look close you will see scratches on the OD of the basket (on the motor side) Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 the scratches aren't real deep, but just wondering what could have cause it?? there are no scratches on the inside of the clutch cover. Quote Link to comment Share on other sites More sharing options...
Aussie Quad Racer Posted January 24, 2004 Report Share Posted January 24, 2004 the basket is like that from the factory so no concern there. How does the rod feel on that piston when you move it? How do the mains feel? can you grab the flywheel and move it up and down? Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 24, 2004 Report Share Posted January 24, 2004 I wouldn't think about putting that piston back in. It has to have some kind of material sticking in toward the bore... you'll probably need to re-bore anyway. That cylinder can't be healthy. I bet the head looks the same !!! Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 24, 2004 Author Report Share Posted January 24, 2004 surprisingly the cylinder looks good. my dome does look similar. most of the what you are seeing feels 'raised' on the surface, rather than pitted. i was wondering if i could just put the piston and dome both it a lathe and hit the faces with some 600 grit or something to get the material that is melted on there off. ?? But am i correct in assuming that i have a bad bearing in the crank? where else would the material come from? i didn't run this motor for more than 3 minutes after a fresh top end. when i cheked the plugs i noticed material on the plug....that's why i pulled the head to see what was up. If it is a crank bearing, where would i have it rebuilt? it's a hot rod crank. how much does a bearing job cost? they are selling rebuilt trued and welded cranks on ebay from time to time for $200. would it be better to just buy rebuilt from ebay or have mine rebuilt? Quote Link to comment Share on other sites More sharing options...
fixitrod Posted January 24, 2004 Report Share Posted January 24, 2004 If you lathe one piston, it will be out of balance from the other. More stress on the crank. You can get a piston for $65. How long has it been since a top end rebuild anyway. That piston may work fine.. I just don't do things that way. I bet it would work... but is it worth it to find out !!! From what I'm seeing you lost a bearing or a ring caught and busted up. What made you take the motor apart. That would in deciding what's going on. As far a rebuilding the crank. What are you going for? Do you want it to run just like it is or are you looking for more performance? If you're looking for it to run like it is, I'd defenitley put a fresh crank in there. I have a used crank that a main bearing went out on. I had the bearing replaced, but I put a stroker in my shee. T.D.R does good crank rebuilds. Send them yours and they'll send you a rebuilt one. I think it's $350 -$400. Or, find a shop that will rebuild them. Some charge $120 plus parts. Lots of options here. Let us know why you took it apart... was the motor locked or what. On the clutch basket, make sure the kick starte gear still has the e clip on it. I had it come off before. I went to the hardware store and bought a little smaller one that has worked out great. I'm not sure if that's your trouble... it's just something that comes to mind. Quote Link to comment Share on other sites More sharing options...
Checkmate Posted January 25, 2004 Author Report Share Posted January 25, 2004 If you lathe one piston, it will be out of balance from the other. More stress on the crank. You can get a piston for $65. How long has it been since a top end rebuild anyway. That piston may work fine.. I just don't do things that way. I bet it would work... but is it worth it to find out !!! i was only thinking on using emery on fine grit sandpaper on the piston and dome to 'clean it up' rather than using tooling and taking off material. the top end is less then 3 minutes old. From what I'm seeing you lost a bearing or a ring caught and busted up. all the rings are intact on both sides What made you take the motor apart. That would in deciding what's going on. i did my first plug chop on the fresh rebuild and saw the metal so i pulled the head to check it out. when i saw the piston top i pulled the jug to check the walls and rings. then i saw the shit in the bottom and pulled the motor out. As far a rebuilding the crank. What are you going for? Do you want it to run just like it is or are you looking for more performance? i just want my shit to run, no need to go stroker...i just bought this crank 20 hours ago T.D.R does good crank rebuilds. Send them yours and they'll send you a rebuilt one. I think it's $350 -$400. Or, find a shop that will rebuild them. Some charge $120 plus parts. do you know the shops names that will rebuild mine for $120 + ? Lots of options here. Let us know why you took it apart... was the motor locked or what. it never locked up. i think i shut it off before anything bad happened. On the clutch basket, make sure the kick starte gear still has the e clip on it. I had it come off before. I went to the hardware store and bought a little smaller one that has worked out great. I'm not sure if that's your trouble... it's just something that comes to mind. thanks, i'll check that out. Quote Link to comment Share on other sites More sharing options...
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