Upper and Lower crankcase

Willmrx

Join Date: Feb 2026

Posts:
#1

Upper and Lower crankcase

12-04-2012, 11:40 PM

I have three engines and all have the same letters stamped on the top crankcases (BBBBB). Will any of the lower crankcase be okay to use? Because they all have the same bearing set, are they interchangeable ? The reason is one of the lower crankcase is in better condition than the others. I want to use the best looking bottom case. I am replacing all the bearings as well.
Thanks.

Will
Tags: None
blowerbike

Forum Guru

GSResource Superstar

Join Date: Aug 2008

Posts: 7057

Location: Ohio Closer to KY Than Cleveland
#2

12-04-2012, 11:42 PM

these are machined sets.
like the main caps on a car engine.
you can not mix and match.
they must be a "matched" set.
Comment
chuck hahn

Forum LongTimer

Past Site Supporter

Join Date: May 2009

Posts: 25918

Location: Norman, Oklahoma
#3

12-05-2012, 06:14 AM

bead blast the case halves and then repaint them..since its already apart that should take only few more hous.

MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.

I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.
Comment

Comment