Honda-SOHC

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

I used their search. "exhaust" and found a 750 with crazy pipes on....

Any blockage in the air intake, like a forgotten cloth underneath the seat?

DS list it - comes with the outer section iirc.

.https://www.davidsilverspares.co.uk/parts/by-part-number/hpart_91022333018/

I've decided to replace all the bearings as the gear selector bearing is pretty rough and the engine is stripped so I may as well.

I can't quite find a bearing for part 91022333018. In the parts manual its bearing, needle, 20mm. On PDF page 25 (https://www.dropbox.com/s/7pieydvznvy7nhp/CB350_F_F1%20Full.pdf?e=7&dl=0) its showing as a bearing inside a metal cylinder, does the bearing come out and a new one slide in?

I know its 20mm but don't know the other measurements. Has anyone found a replacement?