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Messages - Oggers

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151
British Bikes / Re: 66 Bonneville
« on: September 13, 2018, 11:45:49 AM »
Quote
you seem to have missed the point, same casting would do a 9 or 10 stud barrel just drilling as necessary.

If their is any other difference its probably internal

No, since reading around somewhat you are correct in that the same casting appears to have been used for both. 10th hole cast-plugged for the then 120, drilled open for the 140. What I was getting at is that this head is different to the head used for a 66 120 - slightly larger exhaust vv head, stellite tipped vvs and possibly slightly different compression. Considering I have what appears to be the correct barrel, does this give rise to concern? I would have thought not...... 

No leaks anywhere, and I have no issues with the guy who did the rebuild. 

152
British Bikes / Re: 66 Bonneville
« on: September 12, 2018, 08:52:30 PM »
Quote
No mystery, common enough if casting was meant to do two different years, probably a later replacement.Personally I don't like the sound of your engine, but that's just my cynical mind; if it was up to me the engine would be on the bench in bits being checked out now

Ok so is it a T140 head or a T120?

Engine rebuild documentation is fully comprehensive and work was undertaken by Peter Palmer - of some repute I believe in the Triumph world. No issues there I feel.


153
British Bikes / Re: 66 Bonneville
« on: September 12, 2018, 07:15:35 PM »
Clarifying further - hopefully....Barrel is stamped E6305. and some old pistons which I have since found, and for which I have been assured went within said barrel are @70mm diameter.  Thus it appears I have a 650 barrel - though it is squared off at the RH front of the flange.

Head - One stud and nut only between the two rocker covers, but where the other should be about an inch rearward, there is a circular blank off in the casting itself. Definitely only one oval shaped finned rocker cover for both exhaust ports and similar for inlet ports. I know the head of a 140 should have 10 studs, but clearly the barrel being a 650 would have only had the 9. That said, why does the head not have the hole for the 10th stud rather than a cast blank off....all very odd!

154
British Bikes / Re: 66 Bonneville
« on: September 12, 2018, 04:31:11 PM »
Well, all I can say is that I was told it was a T140 head....and from the rocker box covers, it looks like one.

155
British Bikes / Re: 66 Bonneville
« on: September 12, 2018, 03:16:17 PM »
Hmmmm....Forgive me for a supremely dim response, but is it feasible to fit a T140 head on a T120 barrel from a 66? Fairly sure I have a T140 head as I have the 2 siamesed rocker covers - Not sure what I now have for the barrel!


156
British Bikes / Re: 66 Bonneville
« on: September 11, 2018, 04:11:30 PM »
Quite right,  typo by me  - number is DU40025 which corresponds to 1966. No stampings - too early for those. The question about the head was more of a concern than an argument for increased power. I believe it was like that when the engine was rebuilt - meticulously rebuilt from what I read in the extensive report.

I'll check out if the pressure plate is still spinning when clutch is in through the cover in the PCC - thanks for that tip. I guess if it is spinning I adjust at the bars or at the rod threaded end c/w lock nut.

Rest of the bike appears spot on - Boyer, Devon rims, fresh pistons, new paint job etc. Handles very well, engine still a wee bit tight perhaps.

Only other issue is the rear brake rod is fully wound in - with the actuating lever at vertical, and about 6 inches of threaded rod protruding - which seems odd. Either shoes are well worn or the hub has been over-skimmed....thoughts welcome.       

157
British Bikes / 66 Bonneville
« on: September 11, 2018, 10:49:29 AM »
Chaps

New to this forum so please be gentle.... I am fortunate enough to have acquired a 66 Bonneville and would very much appreciate the advice of those who know better on a few points outlined below.

The bike has been fitted with a T140 head. Is this a retrograde step or is it advantageous in some way? Larger valves perhaps?

PCC has the breather tube fitted. I understand these were not fitted until 1970 - could this therefore be a retrofit? Engine/frame number is 400025 - which is a 66.

Gearbox is somewhat "crunchy" but then the bike has only done 500 miles since a full rebuild of the engine and box. Is it worth changing the gearbox oil, and adjusting the clutch rod end via the PCC. Any other tips to achieve a smoother change appreciated.

Carbs. are Amal concentrics - should be monoblocs I think for a 66. Again is this a big deal?

Very many thanks

Mark



   

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