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#264515 - 07/13/09 8:10 pm how tight A65 primary chain??  
Joined: Mar 2006
Posts: 3,647
raf940 Offline
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raf940  Offline
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Posts: 3,647
gastonia nc
my manual says 1/8" OR LESS...i adjusted it to that and it seemed awful tight.....comments?????????????

Last edited by raf940; 07/13/09 8:11 pm.

1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
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#264539 - 07/13/09 10:00 pm Re: how tight A65 primary chain?? [Re: raf940]  
Joined: Oct 2007
Posts: 1,512
Ignoramus Online content
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Ignoramus  Online Content
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Auckland NZ
Raf: Yeah it does seem tight, they never realy make it clear if that means total of 1/8 or 1/8 up AND down (1/4 total). Its a feel thing realy becasue there is a big diffrence between "free movement" of 1/8 and "the most you can MAKE it move 1/8"

Hard to expalin but those triplex chains even though they are as strong as sure whip around in the primary and would take huge latteral loads due to whipping about.

I go for around 1/8 up AND down with little pressure to acheive that movement , ie not forcing it just free movement

Hope you can understand what i mean


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#264542 - 07/13/09 10:29 pm Re: how tight A65 primary chain?? [Re: Ignoramus]  
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raf940 Offline
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raf940  Offline
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Posts: 3,647
gastonia nc
Ignoramus...thanks..got it.1/8 up from center and 1/8 down 1/4 total up and down from rest.....as some of you'uns might recall i cried several days ago about noise coming from primary cover so i tightened chain and it helped a lot but some whirring hollow-sounding tone is still there......


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
#264734 - 07/14/09 6:37 pm Re: how tight A65 primary chain?? [Re: raf940]  
Joined: Apr 2009
Posts: 164
TheInvisibleCity Offline
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TheInvisibleCity  Offline
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Posts: 164
Cleveland, OH
Mine is making a whole lot of racket now so I'm glad you covered this. Mine is definitely loose based on the measurements discussed.

Now why is it that my adjuster doesn't look anything like the one in the manual?? It's bloody hard to get at too!

Mike


'69 A65T
'66 A65T
Late 60's Lightning Bitsa
#264772 - 07/14/09 10:02 pm Re: how tight A65 primary chain?? [Re: TheInvisibleCity]  
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Ignoramus Online content
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Ignoramus  Online Content
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Joined: Oct 2007
Posts: 1,512
Auckland NZ

Raf:
At the risk of getting jumped on, I found that a heavier oil in case shut up a lot of mechanical noise. I used ATF as an experiment (after discussion on board) and personal preferance couldnt stand it (as an engineer i "over-heard" every little metalic ping) which the ATF did not muffel.
I dumped the ATF after about 500miles and just shoved in some 20/50 casue it was what i had. MUCH quiter. Just need to clear the clutch after its been sitting a day or so ...no big deal, didnt need to clear clutch with ATF. Just couldnt stand the noise.



Mike:
AFAI all the A65 adjuster pads/shoes/ramps or what ever they are callled should be the same. If it is making that much noise make sure the chain hasnt cut trough the bonded lining. Some cheep after market ones combined with poorly finished chain (which has quite sharp edges) can do this. NOt saying its the problem cause obviuosly I havent seen it.

If your primary is way out of adjustment fix it NOW! The adjuster nut should be possible to get onto without removing header pipe (assuming std T bolt pipes) you can get it with a whitworth "goose neck" ring spaner working from underneath the pipe. It's a pig but possible.

It might pay to even pull the cover and have a dammm good look at the chain, if its been run dry or been out of adjustment a while it might ruin your summer. Check there are no cracked off rollers. If one is broken its all down hill from there.

The reason for the fairly small free play is becasue of the weight of the chain and the forces (stain) when a heavy chain whips about out of adjstment. Thats why older bikes used "simplex" (single pitch) chains which were much lighter. eg 1/2 x 5/16 was a comon one, less HP and RPM too obviuosly.

If you pull the cover can you post a pic of adjuster?

Good luck

Last edited by Ignoramus; 07/14/09 10:12 pm.

"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#264778 - 07/14/09 10:18 pm Re: how tight A65 primary chain?? [Re: Ignoramus]  
Joined: Mar 2006
Posts: 3,647
raf940 Offline
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raf940  Offline
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Joined: Mar 2006
Posts: 3,647
gastonia nc
Igno.....yep i had ATF in there......but cover is off now for straigtening out what i think was making a lot of the racket(read my post about stator studs)..


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
#264782 - 07/14/09 10:27 pm Re: how tight A65 primary chain?? [Re: raf940]  
Joined: Oct 2007
Posts: 1,512
Ignoramus Online content
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Ignoramus  Online Content
BritBike Forum member

Joined: Oct 2007
Posts: 1,512
Auckland NZ
Raf....try some 20/50 when you reassemble see what you think. U will need to clear the clutch after sitting though....no bigie IMO....will look at your tread about studs.


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#264788 - 07/14/09 11:00 pm Re: how tight A65 primary chain?? [Re: Ignoramus]  
Joined: Mar 2006
Posts: 3,647
raf940 Offline
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raf940  Offline
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Joined: Mar 2006
Posts: 3,647
gastonia nc
cant see how 20/50 would hurt since my 72 OIF T120 shares oil with motor and primary just fine


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
#264835 - 07/15/09 5:47 am Re: how tight A65 primary chain?? [Re: raf940]  
Joined: Apr 2009
Posts: 164
TheInvisibleCity Offline
BritBike Forum member
TheInvisibleCity  Offline
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Joined: Apr 2009
Posts: 164
Cleveland, OH
...actually I'm just an idiot sometimes....the chain adjuster was fine it just looked weird to me....once I wiped all the crud and oil off of it it made sense......I adjusted it today and now everything seems to be just fine in that department

Cheers!
Mike


'69 A65T
'66 A65T
Late 60's Lightning Bitsa

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