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1975 CB500K1 crank rotation resistance

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martin_uk:
Im in the process of reassembling the engine on my 75 CB500K1 basket case that came already stripped.

Crankshaft checked for wear which was minor and well within spec.

Minor marks to crank main shells on 1 and 5 but replaced with new genuine Honda Green shells in line with calculations of housing and journal.

Checked with Plastiguage and all mains came out at 2 thou.

Reassembled with top case down and inserting primary shaft after cases together.

Bearings well oiled and fitted evenly.

Cases closed up easily with light taps with rubber mallet and gradually torqued up as per recommended order but on final torque crank becomes more difficult to turn.

It turns with a spanner on the alternator bolt but feels tighter to turn than I would expect.

I have rebuilt 3 CB750 enfines without this issue.

I have just checked and force required to turn crank is 9 lb ft.

Removed primary shaft and does not change.

Would be interested to hear if any similar issues .

Thanks

Martin

McCabe-Thiele (Ted):
Does the crank have that free movement feel if you make a very small rocking action with the crank?

Do you have any doubts that the crankcase halves were a factory pair?

Bryanj:
You didnt oil the back of the shell did you?

martin_uk:

--- Quote from: Bryanj on May 02, 2024, 01:22:38 PM ---You didnt oil the back of the shell did you?

--- End quote ---
no, but good point.

martin_uk:

--- Quote from: McCabe-Thiele (Ted) on May 02, 2024, 10:53:41 AM ---Does the crank have that free movement feel if you make a very small rocking action with the crank?

Do you have any doubts that the crankcase halves were a factory pair?

--- End quote ---

I will check for end float.

Pretty sure halves original

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