CB 500 resurrection

[gary123]

The 550 is a different bearing with an integrated oil pump to lube the gear shafts but it wont work on 500, would worry me it might lock up as no oil would be pumped

Ok the mix and match nature of my stash of bits is starting to worry me.

[Oddjob]

I'll see if I can find a needle roller out of a 500 for you Gary. No cost. Do you have any of the pins out of one?

It was the slot cut out of the casing where that needle bearing goes, can't remember it on the 500, probably just old age setting in.

[gary123]

Oddjob thats fantastic of you, but just hold off for the moment. I really need to step back and see exactly what I have.
I just compared the shafts against those from a 550 and they appear identical. Im beginning to think someone tried to put a 550 gear set in.
Do you think thats likely, is it even possible?

[Oddjob]

They'll fit but it's possible the forks may not line up properly.

One giveaway on the countershaft is that it has a small cutout in the end of it, opposite end to where the sprocket goes. Look inside the needle roller and you'll see a small flange that turns the little oil pump, the 500 doesn't have anything in the shaft that can drive that, the 550 has. If you see that you know it's a 550 without checking the number of teeth on the gears. 

[gary123]

My primary shaft has 23 teeth which I think is correct for a 500, both the other shafts have the small oil pumps on the end.
Its all very confusing.
As a positive note just got back from Julie and Grahams with a whole heap of shiny parts.

[Laverdaroo]

OOOO, giz a look at yer treasure then!

[gary123]

OOOO, giz a look at yer treasure then!

Yes Ill get some picys up tomorrow.
I had to leave things for a day or so, just couldn't figure things out and ended up confusing my self and getting very pissed off with the damn thing.
It doesn't help that I have such a mix of parts but I think Ive got it sorted now.
The 3 shafts are, as far as I can tell, identical between the 500 and 550. Ive counted teeth till I see em in my sleep and the only difference is the primary drive shaft which has 23 on the 500 and 24 550.
And of course the needle bearings are different on the main and counter as the 550 has the oil pumps.
Tomorrow I'm going to do a temporary "dry" build  to check the gear change action. So far it all seems fine rotating the drum by hand.

[Laverdaroo]

Just what I've done tonight, still on with it and might get the cases together if shes asleep yet

[gary123]

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OOOO shiny bits

[Laverdaroo]

Now thats a haul and a good few evenings worth of fiddling............Good on yer

[Sesman]

“ It’s a piston engine….it was a bargain”. 😁

[gary123]

“ It’s a piston engine….it was a bargain”. 😁

Yeah thats what I tell the wife too.

[gary123]

So completed the dry build and amazingly it all seems to work. [ Guests cannot view attachments ] [ Guests cannot view attachments ] [ Guests cannot view attachments ]

[gary123]

Now disassembling and redoing with correct bearing housings (thanks to oddjob).
This means I now have 550 needle bearing housings (the ones with oil pump) going spare so if anybody needs em FOC give us a shout.

[McCabe-Thiele (Ted)]

With so many mixed parts your build must be like mixing up two jigsaw puzzles then trying to complete one without a picture to help.
Amazing progress so far - I would be having sleepless nights plus getting up at 2.00 am to check something.

Then when you think you have done it Ken points out something you have missed - beware - Ken can be the joker in the pack sometimes.