SOHC.co.uk Forums > CB500/550

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

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Oddjob:
Yep sounds right Ted. Hub is slid into the primary chain before closing the cases, it can be done after but it can be tricky. You leave the spacer that fits between the hub and the oil pump bearing off, as you slide the shaft through as soon as a little juts out of the other side of the hub then you slide that spacer on and keep watching to see if doesn't come off as the shaft moves along. Levering may be needed and usually is if the dampers and the chain have been replaced, you may need to lever the shaft some to align it with the oil pump bearing, leave the oil pump off and look through the opening and you can see which way it needs to be moved to be aligned. It's harder to type that to do.

McCabe-Thiele (Ted):
Thanks Ken I think I understand what's needed now - will my old tube of Hondabond be okay or will it dry too quickly as its old?

Oddjob:
Should be fine Ted, so long as it's still liquid.

McCabe-Thiele (Ted):
Just wanted to check if I have the assembly order correct in my head for the  Primary Drive shaft.

Looking at my inverted upper case the hub will have the primary drive chain in place like in the photo below - it's angled out of position but will straighten up when I fit the upper casing & insert the shaft.

The shaft presently has the following components fitted at one end in this order  - Circlip(new), Gear, Spacer, Bearing, Washer against the hub shaft boss so as to speak. Further down the shaft has a circlip and flat washer in place - then goes the small spacer before the needle roller bearing in the starter clutch.
When I insert this shaft with the bearing through the upper casing with the circlip & large washer fitted I can then  slip on the small spacer then feed the shaft into the needle roller bearing as there is access from above through the sump hole.

I then have to align the end of the splined shaft with the bearing I have previously fitted to the lower casing and tap it into place - leverage may be needed to align the inner race with the splined shaft end.

The eagle eyed will have spotted plenty of excess assembly lube down various thread hole plus plenty of hairs etc.
I will be cleaning up and degreasing both mating surfaces before assembly. Plus gearbox oil seals not yet in position (2)

Do my meanderings sound correct ?

All my current casing bolts are Allen key headed SS bolts with SS washers - I might change the top case bolts for the 8 mm bolt headed type as they are more visible. Not sure if you can buy the specific lengths in SS.


.500 casings by Macabe Thiele, on Flickr


.Primary Drive Shaft assembly by Macabe Thiele, on Flickr

Matt_Harrington:
Ted, are the bolts (flanged) the same style on the 500/550 as the 400/4 ones? - ie reduced head? I'd like to source JIS (reduced head) flanged bolts but the only guy I have found so far wants around £12 a bolt!! - I could make them for much less. Let us know if you manage to source any 8mm bolts with 12mm flanged head in S/S...

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