SOHC.co.uk Forums > CB500/550

Planning ahead - fitting the primary drive unit back in place'

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Oddjob:
As for fitting it back in place Ted, I'd check both of the roller bearings for wear and play etc. Just put the shaft in a vice with the roller bearing sat on the top and after removing the circlip and the gear if it comes off you can just tap the shaft down leaving the bearing on top of the vice.

Reassemble the shaft with the bearing or a new bearing if required, tap home the bearing next to the oil pump, remove the oil pump as well. With the crankcases bolted together and it sitting on it's cylinder studs so the top case is at the bottom you fit the primary drive hub onto the primary chain with the starter gear nearest the oil pump, tap the primary shaft into the hub until it's just about coming through, there is a spacer that needs to be fitted that sits inside the starter gear now, if you fit it before the vibration of you hitting the primary shaft will dislodge it so fit it as described. Tap the shaft further in so the spacer is now on the shaft, here's the tricky bit. You need to look through the oil pimp opening and see where the end of the shaft is and which direction it needs to be moved to line up with the roller bearing, if you have a new chain and rubbers this will involve using a lever to move it to where it needs to be, protect the crankcase as you lever against it so it doesn't damage any surfaces. Small piece of wood will do. When you lever the shaft to align it with the roller bearing in the crankcase tap the shaft home, you may need to move the shaft a little to get the other roller bearing to go into place. Fit the gear (if not already fitted) and the circlip

McCabe-Thiele (Ted):
That makes partial sense to me as a serial overthinker & problem imaginer - has anyone done  a video on U tube a link would be great?

It might be worth a dry run without Hondabond first.

Bryanj:
Honestly Ted its way easier than the descripion, you did the 400 so you can do this one!

Oddjob:
Do not do a dry run Ted, potential for double the damage.

McCabe-Thiele (Ted):

--- Quote from: Bryanj on May 30, 2023, 03:05:42 PM ---Honestly Ted its way easier than the descripion, you did the 400 so you can do this one!

--- End quote ---

The 400 was pretty easy as the centre section did not have a spacer to fall out iirc - it seemed more like one unit somehow.

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