1980 125 KTM

[Mike Lenz]

Well I almost hit a home run on a 80 125 I picked up in MO to restore.  Started taking it apart and cylinder was worn out...but on std bore, Yea!  Clutch looked new, Yea!  However, very little gear oil came out??  Opened up the bottom end and the tranny is ruined from riding with no gear oil!  On top of that cases are cracked and the primary gear bearing has spun in the cases....oh well!

Anyone got a 1980 125 lower end they are willing to sell?

Thanks!
Mike Lenz

[joe novak]

Mike,  Spun bearing?  No problem...  Loc-Tite makes wonderful products designed exactly for that application.  It does not hurt to use a center-punch inside the bearing case area to "raise" the area a bit.   Are the cases Al. or Magnesium?   Both can be welded.   It is a great bike to restore and ride.    Sorry about your misfortune.

[454MRW]

Mike,
Is it the late style 1980-up 125 engine?
http://www.ebay.com/itm/1980-KTM-125MX-125-MX-BOTTOM-END-CRANK-CASES-CASE-PAIR-MOTOR-ENGINE-LEFT-RIGHT-/350658485161?pt=Motorcycles_Parts_Accessories&hash=item51a4dfdba9&vxp=mtr
Or the 1976-Early 1980 style?
http://www.ebay.com/itm/1978-KTM125-KTM-125-MC5-Engine-Cases-/140441302932?pt=Motorcycles_Parts_Accessories&hash=item20b2f43794&vxp=mtr
Jake Fischer had NOS 1976- Early 80 cases for sale a while back and may still have them.
If all else fails, I have a complete 1978 MC-5 125 engine that needs a new piston, because it is a little too scuffed for my taste, but not bored that is .020 over and has an internal rotor Motoplat that I bought from ThrownChain for $400, and was planning on putting it in a 77 MC5 chassis with D-motor 6-day wheels. According to Dennis Jones, it was a heck of a runner when he had it! Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S
1975 Can Am 175 TNT & 77 250 Black Widow
1979 Husqvarna OR390
1976-78 RM & 77-79 PE Suzuki's
1974 CR250M 07 CR125R 79 CR250R

[Mike Lenz]

Thanks Guys, I will try and reuse the cases and there are a few trannys on ebay.