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A65 primary chain tension ? #326506
08/04/10 4:06 pm
08/04/10 4:06 pm
Joined: Jun 2006
Posts: 555
RED BANK NJ
Kenacu Offline OP
BritBike Forum member
Kenacu  Offline OP
BritBike Forum member
Joined: Jun 2006
Posts: 555
RED BANK NJ
I just re tightened the primary chain on my 1965 A65 LR as per the manual, which states "1/8 in. of top to botom play" in the top section of chain, mid span. Now 1/8 in. play is darn near "tight" as well as I can figure. Is this right? or is there some secret meaning to this?. Ken


1965 A65LR
2005 SPORTSTER CUSTOM 1200
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Re: A65 primary chain tension ? [Re: Kenacu] #326512
08/04/10 4:27 pm
08/04/10 4:27 pm
Joined: Sep 2002
Posts: 7,813
Seattle
Alex Offline

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Alex  Offline

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Joined: Sep 2002
Posts: 7,813
Seattle
It is very close to tight...but I would modify the manual's directions to say "no less than 1/8" of play at any point in the primary drive's rotation". Rotate and check, rotate and check...do this at least four of five times. Runout in the crank sprocket and clutch basket as well as uneven wear in the chain can produce tight spots which you want to avoid.


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Re: A65 primary chain tension ? [Re: Alex] #326515
08/04/10 4:44 pm
08/04/10 4:44 pm
Joined: Jul 2001
Posts: 12,934
Central Virginia
Lannis Offline

Life member
Lannis  Offline

Life member
Joined: Jul 2001
Posts: 12,934
Central Virginia
The spec is very confusing. Does it mean "1/8 of free play" or "1/8 of chain movement"?

The chain can be as tight as the high G string on a banjo, and you can still "move" it 1/8" with your hand. I don't think that's what the spec means.

I personally interpret it to be 1/8" "Free Play", where you can wiggle the chain and feel it "hit" the non-free-play region on the up side and the down side, where it'll still move but it's tight.

That's my story and it's worked for me - my present primary chain is the same one that came on the bike new and it's never been a problem.

Lannis


I stopped believing for a little while this morning. Journey is really going to be upset.
Re: A65 primary chain tension ? [Re: Lannis] #326749
08/06/10 12:49 am
08/06/10 12:49 am
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
M
Mr Mike Offline
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Mr Mike  Offline
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M
Joined: Aug 2001
Posts: 3,884
Cape Carteret, NC
Believe it or not, but the manufacturer of industrial chains and sprockets, Browning, described the identical process. For a few bucks you could buy an aftermarket chain tensioning measuring device, but I have found the freeplay, feel system to be adequate. The greater the center distance between sprockets the more free play. On the a65 you want it reasonably tight but not so tight that you put excessive load on the bearings which are further loaded when you accelerate. You will also wear out the chain prematurely if it is too tight and stretch it. If it is too loose you will know it when the rear wheel drives the engine..going down a hill with the throttle closed because now you have the tensioner on the driven side where it does not work so well.. I set mine where I can deflect the chain about 1/8 to 1/4 inch with modest force at the midpoint..whatever that is..... and it seems to work well.

Mr Mike

Re: A65 primary chain tension ? [Re: Mr Mike] #326842
08/06/10 10:38 pm
08/06/10 10:38 pm
Joined: Feb 2007
Posts: 2,248
Atlanta, GA USA
S
Semper Gumby Offline
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Semper Gumby  Offline
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S
Joined: Feb 2007
Posts: 2,248
Atlanta, GA USA
I set mine so it deflects 1/8" inch with a light touch of the finger.


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