chaindrive - 25 pics.

[audijunky]

Thank you sir,
You are a scholar and a gentleman(your the man)

[audijunky]

Was wondering if you knew why Yamaha used the style of bearing they did for the swingarm pivot point? (conical?)and not a regular style ball bearing. I ask because I am going to fabricate a custom swing arm and was planning to use regular style bearings or maybe even bushings.

[Pat Kelly]

Possibly for centering the swingarm with the least amout of friction. Also to allow for preload, maybe related to it being shaft-drive?
Just musing here.

[audijunky]

Well I just got off the phone with a tech support guy for sprocket specialists.com and I believe we may have found a 13 and/or 14 tooth sprocket to fit our machines. It is a replacement for a 66-69 Honda CB 77. I just got done ordering one for 25.00 and will let ya know if it will work or not. The part # for them is 506-13 if you want to take a look.
Have a good day,
Steve

[pggg]

Audi, brilliant detective work! Those C77 front sprockets sound like they're compatible, here's a quote from a webpage

- Sprocket Specialists produces high quality replacement sprockets for most make and model machines. Case hardened and precision cut for excellent fit and finish.

Fits: Honda CB75 Hawk 1964 to 1966 CB77 1966 to 1969 CL77 1966 to 1968 also fits Yamaha TX/XS650 upto 1983 and TX750A 1973 to 1974

SS # 506 13 TOOTH Front Sprocket 530 Chain size

Here's a pic of the C77 pattern, and it sure looks the same as the XS

[pggg]

PS the bearing in question is a side thrust bearing that handles the sideways force coming from the right-angle bevel, only needed if running the shaftdrive, there's no torque reaction with a sprocket so a 'normal' bearing does the trick.

[50gary]

I've ordered 506 countershaft sprockets from Sprocket Specialists for my XS650 (all models) in 520 or 530 chain. I use 520 X-ring by D.I.D. They list 13T to 18T chromloly steel. On page 52 of my catalog.
Cheers, 50gary

[Pat Kelly]

Originally posted by 50gary
I've ordered 506 countershaft sprockets from Sprocket Specialists for my XS650 (all models) in 520 or 530 chain. I use 520 X-ring by D.I.D. They list 13T to 18T chromloly steel. On page 52 of my catalog.
Cheers, 50gary

That's a lot of sprockets

[pggg]

Yeah I've got 4 of them and I thought that was a lot! Looks like "Sprocket Specialists' are about the only manufacturer to supply those XS650/C77 sprockets smaller than the usual stock 16-17 tooth
http://www.sprocketspecialists.com/S...?txtSearch=506

Good to know I won't have to resort to those rip-off machinists again, although a US$25 sprocket will probably still cost 50$NZ down here.

[audijunky]

Hey pggg, if you think it would be cheaper for me to purchase them, then mail them to you I could do that. If you need any?

[pggg]

Hey Cheers Audi, actually I've got enough sprockets to last for a few more years yet, but thanks for the offer .

[audijunky]

IT fits, it fits, LIKE A GLOVE.
hey PGGG,
How did you get the holes lined up on the plate for the extended bolts. I have cut my housing, And traced the gasket on a piece of metal but cant figure out how to precisely figure out where to drill the holes for the outer bearing housing. I am sure they need to be perfect to keep the shaft straight.
Thanks

[pggg]

Matching holes to copy to a steel plate, the holes in the gasket give 4 of them, then a matter of positioning another middle hole to match the chrome cover, the gasket sits in only one position, find that, pinpoint the hidden hole position on the gasket with a ballpoint pen, the chrome cover gives the remaining hole position.

Further 4 more holes up front aligned with front engine case bolts, I cut down some 6mm bolts, screwed them into the engine case, painted a tiny thick blob of paint on the ends(dead centre) and unscrewed the bolts slowly a couple of mm's till the paint left pinpricks on the steel plate

[pggg]

Whoops -

[audijunky]

I guess you didnt use the two holes to the far right to allow for chain clearance? The one with xx on it and the one above?