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#221037 - 10/28/08 9:47 pm 1972 T120 valve setting  
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
getting ready to set the valves on my bike...should i use the haynes manual setting or ?????????????seems i recall there has been some controversy on this
thanks
stay warm it finally got cold down here in NC today


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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#221043 - 10/28/08 10:54 pm Re: 1972 T120 valve setting [Re: raf940]  
Joined: Feb 2006
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Florida TR6 Offline
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Florida TR6  Offline
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Posts: 589
Florida

Posted October 2006 by John Healy:

"Scout Dog:

Some notes: Although the factory figures were .002" and .004" for the 650, west coast distributor, Johnson Motors, recommended running the 650's with .004" and .006". At these figures the valves were not particularly noisy."


"For every problem, there is a solution that is simple, neat, and wrong." H.L.MENCKEN
'06 T100 Bonneville
'70 TR6 Bitsa, Pazon EI
#221046 - 10/28/08 11:01 pm Re: 1972 T120 valve setting [Re: Florida TR6]  
Joined: Mar 2006
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raf940 Offline
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raf940  Offline
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gastonia nc
ah so....but why the wider settings??


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
#221078 - 10/29/08 1:47 am Re: 1972 T120 valve setting [Re: raf940]  
Joined: Mar 2005
Posts: 460
Jethro Offline
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Jethro  Offline
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Posts: 460
Cincinnati, Oh
Boy, this is an interesting bag of worms... I'm not sure some ppl who THINK they know how to set valves DO... probably starting with me. The basic premise behind the idea of setting the valves "slightly loose" is protection. Meaning, if the valves are too tight, they will not be able to cool sufficiently, and they can indeed "burn up". Too loose and performance suffers, and the valves can also be very noisy, as Florida points out. I have tried to set the valves at both clearances referenced above. I think I have been successful, and for ME... and me only, I do notice a difference when the valves are set to factory standards on my 71 T120. But then again, I am careful not only setting them, but checking them multiple times before buttoning everything up. I forgot to point out also, that some riders feel the difference in modern petrol is a good reason to provide a "cushion" that older, lead based fuels provided.

Last edited by Jethro; 10/29/08 1:55 am.
#221095 - 10/29/08 8:46 am Re: 1972 T120 valve setting [Re: Jethro]  
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dave jones Offline
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dave jones  Offline
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Emsworth, sunny south of Engla...
I set mine with feeler gauges to 2 and 4 and it is ok. However, after a very high mileage, the valves can acquire a dent in the top where the rockers bear on them which the feeler doesn't take into account so you get a bigger clearance anyway!

#221105 - 10/29/08 11:32 am Re: 1972 T120 valve setting [Re: dave jones]  
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DPO Offline
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DPO  Offline
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Douglasville (Atlanta) Georgia
Are ya'll talking about the valve clearance, as far as the gap between the rocker and the stem? I set mine per the manual at .020, runs sweet...what am I missing here?


If you love it, let it go. If it comes back, you've highsided!"

1971 Triumph T120
2005 Triumph "America"
1976 BMW R90/6
#221109 - 10/29/08 12:22 pm Re: 1972 T120 valve setting [Re: DPO]  
Joined: Oct 2003
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dave jones Offline
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dave jones  Offline
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Emsworth, sunny south of Engla...
DPO- If you have a unit 650 Triumph the original clearances were .002" inlet and .004" for the exhaust. What you are using, if you haven't written it incorrectly, is 20 thousandths of an inch which is too big. Some people like to set them a little wider than the original book to .004" and .006".

Dave

#221111 - 10/29/08 12:30 pm Re: 1972 T120 valve setting [Re: DPO]  
Joined: Jan 2008
Posts: 1,113
Jack Adams Offline
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Jack Adams  Offline
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Joined: Jan 2008
Posts: 1,113
Noblesville, IN
DPO, What are you missing here? A real manual? A decimal point? A correct feeler gauge? Common sense? Take your pick. Indiana Rooster

#221112 - 10/29/08 12:49 pm Re: 1972 T120 valve setting [Re: Jethro]  
Joined: Nov 2005
Posts: 7,217
JubeePrince Online content
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JubeePrince  Online Content

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Posts: 7,217
Back on the mainland!
Originally Posted By: Jethro
Meaning, if the valves are too tight, they will not be able to cool sufficiently,


The bane of air-cooled engines: how to keep them cooled sufficiently....

The valves need to seat well and uniformly in order for the heat to be dissapated to the head....the head acts as a heat sink for the valves...

If the valve or seat is not Concentric, or the lash is too tight, you end up with hot gases heating the edge of the valve.....then you have a nice glow plug to start the process of preigntion.....it all goes slowly downhill from there.....

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#221114 - 10/29/08 1:06 pm Re: 1972 T120 valve setting [Re: JubeePrince]  
Joined: Mar 2006
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raf940 Offline
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raf940  Offline
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gastonia nc
i recollect an old guy i used to know who worked on british cars..especially austin-healy 3000s..his motto on valves was ..."valves are like f*rts..i would rather hear them than smell them (burning)"


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
#221118 - 10/29/08 1:43 pm Re: 1972 T120 valve setting [Re: raf940]  
Joined: Aug 2007
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Blapper Offline
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Blapper  Offline
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Kent UK
laughing I like it!

Blapper redwine

#221123 - 10/29/08 2:22 pm Re: 1972 T120 valve setting [Re: Blapper]  
Joined: Jan 2008
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Jack Adams Offline
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Jack Adams  Offline
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Posts: 1,113
Noblesville, IN
I just realized that DPO was using .020 for both cams because he was using the specs. for degreeing cams as running clearance.As usual DPO was just being consistant. Also I must have a different idea as to what "running sweet" means. I know "a slappy tappet is a happy tappet" but .020 is way past happy! Jack


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