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View Full Version : yz 250 swingarm bolt problem


Mr.Atc
07-25-2010, 09:26 PM
im restoring a 1981 yz 250 this thing hauled ut the engine is wore out and the frame needs painting but it just so happns that the swingarm bolt wont come out i tried heating it and spinning it with the impact and hitting it the only thing i havent tried is putting a punch in the center of the bolt since it is hollow and using a sledge hammer i dont want to ruin the bolt though i dont know if i can get a new one....any ideas im pretty much screwed if i cant get this bolt out i really need your help on this one guys!!! :wondering
Yamahondaman
07-26-2010, 10:13 AM
AH MAN !!!! back 6 year's ago i had one but it is at a buddy's house .. i'll go today and see if he still has it .. also i Milled and Turned the Jug to fit on the ATC Bottom End.. look's like a MUGEN Cyl. !! i'll HOLLAR Tommorrow
Ronnie
oldskool83
07-26-2010, 02:59 PM
lots of PB blaster, wait a day or 2, then get a big hammer. prob the bearings are rusted to the bolt. happened to a 85 rm125 i had once...6 hours to get it out. lots of heat, some one on here makes new pivot bolts for trikes so i dunno why they couldnt make a new one for a dirtbike. i bet all the grease is gone in it also.
Yamahondaman
07-26-2010, 03:57 PM
some one on here makes new pivot bolts for trikes so i dunno why they couldnt make a new one for a dirtbike.
I made several of them ... Stainless .. but i need one to copy
3wheelmecca
07-29-2010, 06:36 PM
All YZs Ive ever owned had that problem. If you pull the shock and such, tie the swinger to the top of the subframe, then throw some heat at the bearings , put in a punch, and tap like hell. It has worked for me on my De-Carbon and Mono Cross systems.
dirtjunkie85
08-12-2010, 05:47 PM
Yeah i would'nt be afraid to use some force. just PB blast the heck out of it and let it sit must make sure the punch you use doesnt mar up the threads and such and i dont think you will have a big problem. I agree that the bearings are probably frozen to the bolt. I wouldnt worry too much about finding the bolt again. I would check with Bikebandit.com and see if they have one. they carry alot of OEM stuff.