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#500969 - 08/09/13 9:54 am TR6 Heads  
Joined: May 2006
Posts: 148
TriVin Offline
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TriVin  Offline
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Joined: May 2006
Posts: 148
Warrington, Cheshire, UK
I came across someone selling a SRM refurbished single carb 9 stud head. The casting number in it is E3925.
I have a data sheet from postdiluvian
http://www.postdiluvian.org/~mason/moto/heads.html
which indicates that it could be anything from 1963 - 1970.
However there are 3 different part numbers shown for 3 periods within those years. That would be differences in the guides I suspect, as the part numbers would be shown as assemblies in the parts manuals.
The main question is will this head fit on my 72 Bonnie? Physically I guess it would but what are the implications of the different guides? Indeed, does anyone know what the difference might be? The seller does not know what the head came off originally as he is only selling the stuff for the widow of his mate, sadly.

Last edited by TriVin; 08/09/13 9:56 am.

Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
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#500971 - 08/09/13 10:29 am Re: TR6 Heads [Re: TriVin]  
Joined: Jul 2009
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Pete R - R.I.P. Offline
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Pete R - R.I.P.  Offline
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Vic. Australia
There's less metal on the early heads (pre-'71) around the inner 3/8" head bolts.You'd need to fill that with welding,or maybe JB-weld,to avoid leakage at the rocker box gasket.

The other main differences are BSC threads before '69,and smaller valves before '67.

#500973 - 08/09/13 10:36 am Re: TR6 Heads [Re: TriVin]  
Joined: Sep 2011
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Excalibur Online content
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Excalibur  Online Content
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Joined: Sep 2011
Posts: 933
New Zealand
I suppose you are aware that the '63-70 9stud heads use a different rockerbox and head bolt arrangement than the '72.
Also the early heads have push-over exhaust stub.
If you are determined enough and solve those, you'll need an inlet manifold to suit.

#500991 - 08/09/13 1:04 pm Re: TR6 Heads [Re: Excalibur]  
Joined: May 2006
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TriVin Offline
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TriVin  Offline
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Posts: 148
Warrington, Cheshire, UK
I received these photos from the seller to help identify its year.





Dave
Tiger 100SS 1966
T120V 1972
Vincent Comet 1952
#500995 - 08/09/13 1:31 pm Re: TR6 Heads [Re: TriVin]  
Joined: Sep 2011
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Excalibur Online content
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Excalibur  Online Content
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Posts: 933
New Zealand
Originally Posted By: TriVin
I received these photos from the seller to help identify its year.


Photo #2, isn't that a year-of-casting mark between the guides and above the prt hole.
Also 3 of rockerbox outer bolt threads have been repair welded, drilled & tapped.

Last edited by Excalibur; 08/09/13 1:34 pm.
#501076 - 08/10/13 12:50 am Re: TR6 Heads [Re: Excalibur]  
Joined: Aug 2001
Posts: 6,666
Jon W. Whitley Online content
Jon W. Whitley  Online Content



Joined: Aug 2001
Posts: 6,666
Vermont
Yes, those two digits in that circle will definitely help narrow the year down.


Originally Posted By: Excalibur

Photo #2, isn't that a year-of-casting mark between the guides and above the prt hole.



Jon W.


1957 6T Thunderbird 650
1971 TR6R Tiger 650
1955 Tiger 100 - Project
1970 BSA A65F 650 - Project

#501102 - 08/10/13 8:45 am Re: TR6 Heads [Re: TriVin]  
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dave jones Offline
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dave jones  Offline
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Emsworth, sunny south of Engla...
If the year numbers are there then I believe that if it says 66 it would be for a 67 model, etc.

I thought that the oil in frame heads have some smaller holes by the large centre studs where the rocker boxes fit. Also, you would have to make sure that the cutouts for the top of the pushrod tubes are the same as on your current head.

Dave

Last edited by dave jones; 08/10/13 8:48 am. Reason: added another sentence

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