Topic: HELP! bad crank from cb750k 1977

[la ca fe]

I have a '77 k motor with a bad crank.
Does anyone know if other cranks from other year cb750 's will work or are they year specific?

Do I need a replacement crank from a '77k only?

[754]

70 to 78 should work, except for Automatics.

[Tracksnblades1]

It's a selective process. The main bearing journals can have different size bearings from the factory. Same with the four rods. Read your codes on crank and case.
👀👀👍

[Tracksnblades1]

This may help....

[754]

They all fit all the years, put the crank markings and case markings together and select your bearings.
 Some run all one color and clearance be damned.

[Don R]

 A friend of mine has been building and rebuilding 750's for years. He buys green bearings for everything and checks clearance with plastigauge. Rarely makes an adjustment. That said it can't hurt to read the sizes since these are all over 40 years old.

[la ca fe]

Thanks for the replies everyone,
I found a motor that is the same year that I am going to take the crank out of to use.
I wonder if the bearings will work? Same year.

[754]

Year has nothing to do with it, read the codes on the case, both sets.
 If the same, then you might be able to swap bearings .

[la ca fe]

Thanks!