CB77 chain

GregMcN · Post by **GregMcN** » Sun Jul 23, 2017 4:13 pm

My CB77 filter chain looks pretty slack is this normal?
Clymer manual quotes:5 to 10 standard with a repair limit of 15 or 0.196 - 0.3937 standard with a 0.5905 repair limit based on amplitude at the centre but do not really know what they are measuring or what the units are.
Any thoughts?
Can you actually buy one if it is out of spec?
Thanks Greg

Merz64cb77 · Post by **Merz64cb77** » Sun Jul 23, 2017 7:29 pm

Hi Greg
I can't speak to the specs but I did find a new chain if your interested.

http://www.classichondarestoration.com/ ... d_406.html

G-Man · Post by **G-Man** » Mon Jul 24, 2017 2:32 am

Sprockets Unlimited are pretty good at sourcing oddball chain, as well.

http://www.sprocketsunlimited.com

They found a supply of CB72 primary chain material a while back.

G

Merz64cb77 wrote:Hi Greg
I can't speak to the specs but I did find a new chain if your interested.

http://www.classichondarestoration.com/ ... d_406.html

cknight · Post by **cknight** » Mon Jul 24, 2017 7:09 am

There's currently a new 15478-259-000 oil filter chain on eBay UK. Chain designation is DK210F, 40L. The free-play measurement units appear to be inches. Regards, Chase

GregMcN · Post by **GregMcN** » Mon Jul 24, 2017 3:59 pm

Thanks all

I did eventually realise that the units must have been mm and inches and I think they refer to the slack at the mid point between filter and drive cog. Mine looks very loose but when measured (about 11.5mm) it falls outside the standard value but below the repair limit.
Not sure whether to buy one of the NOS ones spotted by CK, hard to be sure on condition and not cheap by the time posted to the UK......... but then nothing is for old bikes!
Greg

kyan · Post by **kyan** » Mon Jul 31, 2017 10:56 am

hi i am new here, i dont know if anyone can help me, i have been thinking about getting a bike but i am a short stature guy, can anyone recommend any bike frame, brand or anything that might help me? Specially because i just got this Schott leather jacket and i have been reading that this is a good brand to wear when riding.

Tim Allman · Post by **Tim Allman** » Mon Jul 31, 2017 6:06 pm

GregMcN wrote:Thanks all

I did eventually realise that the units must have been mm and inches and I think they refer to the slack at the mid point between filter and drive cog. Mine looks very loose but when measured (about 11.5mm) it falls outside the standard value but below the repair limit.
Not sure whether to buy one of the NOS ones spotted by CK, hard to be sure on condition and not cheap by the time posted to the UK......... but then nothing is for old bikes!
Greg

I just had a look at the repair manual. The standard is 5 - 10 mm and the repair limit is 15 mm. If it were my bike I would believe the manual and reinstall the chain.

It's worth noting that the slack may not be due entirely to chain wear. If the clearance between the oil filter body and its shaft has opened up a bit, that would have a significant effect too.

EDIT:
A better way to check chain condition is to wrap it tightly around a sprocket (use the larger one) and see how far you can pull the midpoint of the chain away from the sprocket. A new chain and sprocket will fit each other very closely and it will be difficult to see any movement. If you can pull the chain more than a mm or two from the sprocket, this indicates significant wear.

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