CB77 chain

[GregMcN]

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]

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]

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

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]

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]

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]

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]

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.