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CB350 K4 Cam Chain Tensioner/Roller Diameter ?
Posted: Sat May 28, 2016 6:08 am
by Phil-UK
Hi
Anyone able to tell me what diameter the large rubber cam chain roller is on the CB350 K4 ?
Part Number - 14601-312-000
It seems cheap @£8 and I wondered if it would be a viable replacement for a CB72/77 cam chain tensioner rubber as per G-Man's efforts using the CB72/77 Primary Chain Roller.
thank
Phil
CB 250/350 tensioner roller
Posted: Tue Jun 14, 2016 1:39 am
by GORDON BROWN
Hello Phill
Had just noticed your post, so I measured a new K roller I had.
ID 15.5mm
OD on rib 55mm
OD on flat 50.6mm
W at bush 15mm
W at outside 10mm
Unfortunately it is also narrowed like a CB72/77 one ( in the wrong place for reducing it to a smaller dia. ) and the centre is too small.
Pity, as you said they are inexpensive and available. Anyway with the pile Graham is making he will be able to supply us all for the next hundred years.
Gordon
Re: CB 250/350 tensioner roller
Posted: Tue Jun 14, 2016 2:01 am
by G-Man
Gordon
That's handy to know.
I bought a Kawasaki one on eBay, just for interest and I think it would be possible to use.
It is parallel sided and measures
ID 13.0mm
OD on rib 50mm
OD on flat 46mm
W at bush 12mm
W at outside 10.5
It's been sitting on my desk for months. It would need a custom pin / bush but could be a helpful alternative. Not too sure what bike it was from, maybe a small four?
Actually, thinking a bit more. We could put a bronze bush in and use the pin and centre bush from the 'small wheel' tensioner. That could work......
I need to work out what bike it was from, don't I?
G
mm
GORDON BROWN wrote:Hello Phill
Had just noticed your post, so I measured a new K roller I had.
ID 15.5mm
OD on rib 55mm
OD on flat 50.6mm
W at bush 15mm
W at outside 10mm
Unfortunately it is also narrowed like a CB72/77 one ( in the wrong place for reducing it to a smaller dia. ) and the centre is too small.
Pity, as you said they are inexpensive and available. Anyway with the pile Graham is making he will be able to supply us all for the next hundred years.
Gordon
Posted: Tue Jun 14, 2016 2:11 am
by G-Man
Posted: Tue Jun 14, 2016 2:52 am
by Phil-UK
Interesting ... could be worth a punt Phil
Posted: Tue Jun 14, 2016 2:42 pm
by G-Man
Not suggesting anyone goes out and buys one of these but this is a really nice part. A rubber-mounted sprocket with rubber lands for the cam chain plates to run on.
A sort of deluxe touring Capellini item......
http://www.cmsnl.com/kawasaki-z1-1973-u ... 2BdV1c2VEU
Love to get hold of one and try it in the Honda tensioner..... :-)
G