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1972 T120 valve setting #221037
10/28/08 9:47 pm
10/28/08 9:47 pm
Joined: Mar 2006
Posts: 3,667
gastonia nc
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raf940 Online content OP
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raf940  Online Content OP
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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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Re: 1972 T120 valve setting [Re: raf940] #221043
10/28/08 10:54 pm
10/28/08 10:54 pm
Joined: Feb 2006
Posts: 589
Florida
F
Florida TR6 Offline
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F
Joined: Feb 2006
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
Re: 1972 T120 valve setting [Re: Florida TR6] #221046
10/28/08 11:01 pm
10/28/08 11:01 pm
Joined: Mar 2006
Posts: 3,667
gastonia nc
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raf940 Online content OP
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raf940  Online Content OP
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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
Re: 1972 T120 valve setting [Re: raf940] #221078
10/29/08 1:47 am
10/29/08 1:47 am
Joined: Mar 2005
Posts: 460
Cincinnati, Oh
Jethro Offline
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Jethro  Offline
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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.
Re: 1972 T120 valve setting [Re: Jethro] #221095
10/29/08 8:46 am
10/29/08 8:46 am
Joined: Oct 2003
Posts: 3,524
Emsworth, sunny south of Engla...
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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!

Re: 1972 T120 valve setting [Re: dave jones] #221105
10/29/08 11:32 am
10/29/08 11:32 am
Joined: Jun 2007
Posts: 1,637
Douglasville (Atlanta) Georgia
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
Re: 1972 T120 valve setting [Re: DPO] #221109
10/29/08 12:22 pm
10/29/08 12:22 pm
Joined: Oct 2003
Posts: 3,524
Emsworth, sunny south of Engla...
D
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

Re: 1972 T120 valve setting [Re: DPO] #221111
10/29/08 12:30 pm
10/29/08 12:30 pm
Joined: Jan 2008
Posts: 1,113
Noblesville, IN
Jack Adams Offline
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Jack Adams  Offline
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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

Re: 1972 T120 valve setting [Re: Jethro] #221112
10/29/08 12:49 pm
10/29/08 12:49 pm
Joined: Nov 2005
Posts: 7,259
Back on the mainland!
JubeePrince Online content

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Posts: 7,259
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...
Re: 1972 T120 valve setting [Re: JubeePrince] #221114
10/29/08 1:06 pm
10/29/08 1:06 pm
Joined: Mar 2006
Posts: 3,667
gastonia nc
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raf940 Online content OP
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raf940  Online Content OP
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Posts: 3,667
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
Re: 1972 T120 valve setting [Re: raf940] #221118
10/29/08 1:43 pm
10/29/08 1:43 pm
Joined: Aug 2007
Posts: 4,542
Kent UK
Blapper Offline
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Kent UK
laughing I like it!

Blapper redwine

Re: 1972 T120 valve setting [Re: Blapper] #221123
10/29/08 2:22 pm
10/29/08 2:22 pm
Joined: Jan 2008
Posts: 1,113
Noblesville, IN
Jack Adams Offline
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Jack Adams  Offline
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Joined: Jan 2008
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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