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Another T120 added to the fold

Another T120 added to the fold

Postby daveh » Fri Apr 14, 2017 7:19 am

Guys, I bought this T120 (1967) recently. Needs a lot of work. I trawled the Net for sources of information but hope that some of you who are knowledgeable can advise.

The previous owner rebuilt the motor, so I hope I'm starting from a sound base. I've ridden it around the block and there's zero damping in the forks, so a complete front end overhaul is needed. No nasty noises, idles evenly, missing/hesitating under load but does rev out. I'm not too worried about that (Boyer ign). "Under the hood" it has a belt drive and SRM clutch.

Clearly, it's missing a complete exhaust system, centre stand, speedo and cable, clock mounting bracket, and chain guard. The side stand doesn't look like it's from a unit twin, or is it even in the right position? The petrol tank is the larger (UK?) tank. Looks like it has the wider US handlebars. And looks like it's also missing a steering damper. Was that standard fitment on the T120R?

I understand the TLS front brake was added in 1968 but should be a useful mod. The rear light mounting looks like it's from a later US model year. The tank is 'sort of' painted in 1966 pattern and colours, but I think the orange should be grenadier red? What is the lug for on the front of the headstock (last pic, at 7 o'clock under the steering lock as viewed from this angle)?

The log book says January 1967, engine and frame numbers match (DU52907), so I guess it would have come originally with Monoblocs and SLS drum? I have seen what are claimed to be authentic restorations with Concentrics, grey seat tops and TLS front brakes and a variety of paint jobs. Was the factory paint job aubergine and white (US), or aubergine and gold, (UK) with chrome/ss fenders or painted? Can anyone please clarify? I don't mind too much if the final outcome is UK or US spec.

My aim is to make the bike complete, ditch the TT style pipes, fix the slight oil leaks, have a bit of fun with it, and get it to a stage where I can hand it on to someone else in good fettle.

Your comments would be welcome!

Dave

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Re: Another T120 added to the fold

Postby grandpaul » Fri Apr 14, 2017 7:31 am

Nice enough bike to look at, but it's a bitsa.

I'd keep the 69/70 front brake, it's the best on a Bonnie.

If you check the serial numbers, and it is actually a '67, there are variables

Early-
Aubergine & White, all laid on Gold sheen
Monoblocs
Gray-topped seat

Late-
Aubergine & Gold
Concentrics
All black seat

It's got a hacked meter bracket, needs to have the duals with gray faces.

Should have a chain guard with the rear brake light switch mounted nearer the front.

Should have shrouded shocks.

Definitely needs the earlier alloy bodied tail light housing, my favorite.

Keyswitch belongs in the left sidecover at the upper front.

There is nothing "wrong" with it as-is (apart from needing a speedo and chain guard). It'll get it's fair share of compliments just as it is (well, fix the oil dribbles, or you'll get all the usual comments on that note)
Last edited by grandpaul on Fri Apr 14, 2017 7:37 am, edited 1 time in total.
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Re: Another T120 added to the fold

Postby grandpaul » Fri Apr 14, 2017 7:36 am

"Far from perfect", but I like it.

Still among my top 3, and I've owned 163 bikes...

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I went with gray-topped seat, monobloc carbs, stainless fenders, and Aubergine & White paint. It already had the '70 style grab rail when I bought it.
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Re: Another T120 added to the fold

Postby Triton Thrasher » Fri Apr 14, 2017 7:52 am

Putting oil into the forks may restore the damping.

That wiring, with silly red and blue crimped terminals, will give you trouble.
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Re: Another T120 added to the fold

Postby daveh » Fri Apr 14, 2017 8:24 am

Thank you Grandpaul and Triton Thrasher.

Indeed, that wiring is awful and I aim to sort it properly!

Thanks for the info on paint schemes. I think the paint will be the last on my list of things to do but still good to know. How about a brighter shade of red and white but to the factory pattern - colour above, white on gold sheen below? and with white fenders and a stripe down the middle? Or would that upset people?

Ah, didn't know about the ignition switch position. Is that from a later model year? The US style tail light mount looks neat and I will get that.

I haven't visited this forum much in the last few years, but there used to be a member here and on a BSA singles forum (Kommando) who devised an ingenious damping mod for external spring Triumph forks. Is he still about?

Cheers,

Dave

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Re: Another T120 added to the fold

Postby grandpaul » Sat Apr 15, 2017 5:26 am

I should have noticed your location, of course your paint scheme pattern will be different from my U.S. variant.

I think the '66 paint scheme you have looks very nearly correct to my eye, but may look different enough in person that it puts you off. I like it just fine on my '66...

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Re: Another T120 added to the fold

Postby daveh » Sat Apr 15, 2017 7:19 am

grandpaul wrote:I should have noticed your location, of course your paint scheme pattern will be different from my U.S. variant.

I think the '66 paint scheme you have looks very nearly correct to my eye, but may look different enough in person that it puts you off. I like it just fine on my '66...

Image


She looks very nice indeed, Grandpaul. Thanks for posting.

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Re: Another T120 added to the fold

Postby Fast Eddie » Sun Apr 16, 2017 7:08 pm

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Re: Another T120 added to the fold

Postby daveh » Mon Apr 17, 2017 4:43 am

Hi Fast Eddie - I have followed your build threads on the main forum with great interest, and thanks for the link. I had seen it before and I have to admit disappointment at seeing that aubergine was the official factory colour that year! Still, I think that, overall, Triumphs had the best and most flamboyant paint schemes of any factory in the 60s.

Cheers,

Dave

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Re: Another T120 added to the fold

Postby Fast Eddie » Mon Apr 17, 2017 5:54 am

daveh wrote:Hi Fast Eddie - I have followed your build threads on the main forum with great interest, and thanks for the link. I had seen it before and I have to admit disappointment at seeing that aubergine was the official factory colour that year! Still, I think that, overall, Triumphs had the best and most flamboyant paint schemes of any factory in the 60s.

Cheers,

Dave


Some of them are too flamboyant for my simple tastes, that's one of the reasons the '68 T120R (ie US spec) is my favourite. To my eye, it lets the design speak for itself, rather than rely on fussy paint schemes.

But, IMHO, unless you're aiming for a conkers trophy winner, then just choose the Triumph paint scheme you prefer. Sure, some folk at club nights will delight in telling you that your '66 has a '67 paint scheme (or whatever) but you can take delight in telling them "I know... Lovely innit"!?
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Re: Another T120 added to the fold

Postby nortriubuell » Thu Apr 20, 2017 7:32 am

Fast Eddie wrote:
daveh wrote:Hi Fast Eddie - I have followed your build threads on the main forum with great interest, and thanks for the link. I had seen it before and I have to admit disappointment at seeing that aubergine was the official factory colour that year! Still, I think that, overall, Triumphs had the best and most flamboyant paint schemes of any factory in the 60s.

Cheers,

Dave


Some of them are too flamboyant for my simple tastes, that's one of the reasons the '68 T120R (ie US spec) is my favourite. To my eye, it lets the design speak for itself, rather than rely on fussy paint schemes.

But, IMHO, unless you're aiming for a conkers trophy winner, then just choose the Triumph paint scheme you prefer. Sure, some folk at club nights will delight in telling you that your '66 has a '67 paint scheme (or whatever) but you can take delight in telling them "I know... Lovely innit"!?


+1 ... cool as is 8) ... I wouldn't bother changing a thing.
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Re: Another T120 added to the fold

Postby daveh » Thu Apr 20, 2017 8:36 am

Fast Eddie wrote:Sure, some folk at club nights will delight in telling you that your '66 has a '67 paint scheme (or whatever) but you can take delight in telling them "I know... Lovely innit"!?


Ha, yes, I wish there wasn't so much of this pc attitude.

+1 ... cool as is 8) ... I wouldn't bother changing a thing.


Thanks, Nortribuell, which by the sound of your moniker means you are a Triumph owner, among other marques? What do you have?

More seriously, though, the forks need a complete rebuild, probably new stanchions and bushes, and I'm planning some damper mods. The ovality needs to be machined out of the front brake drum and oversize proper decent linings machined and fitted. Swinging arm pivot is worn, a few oil leaks here and there, and probably a new wiring harness needed. I need to delve into the carbs to check the jets and sizes and go over the connections to the Boyer ignition.

The paint will be the last consideration because I want to get it fully operational first. I might make some moderate rear sets to go with lower bars and a reverse gear shift lever which would make it one up, three down - a better way to shift. Any mods I make will be reversible to stock.

Question: Since I'm new to these motors, how does it breathe - through the primary case? Is this adequate and can one avoid oil dribbling out? Could you hook up a reed valve crankcase breather, is it worth doing, and could it be reversible to stock? The XS 650 breather mod for my Commando and Ducati 450 worked a treat.

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Re: Another T120 added to the fold

Postby grandpaul » Fri Apr 21, 2017 6:24 am

The engine breathes through a timed breather, same as early Commandos. The exhaust pipe is WAY up under the engine, above and ahead of the drive sprocket where it is extremely hard to get to unless you lay the bike on it's side.

It is reasonably effective, and doesn't benefit as much from a reed valve as a Commando.

That exit pipe joins the tank vent at a curiously shaped y-pipe in the battery area under the seat, then exits out a long pipe to the rear fender near the tail light.
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Re: Another T120 added to the fold

Postby daveh » Fri Apr 21, 2017 7:05 am

grandpaul wrote:The engine breathes through a timed breather, same as early Commandos. The exhaust pipe is WAY up under the engine, above and ahead of the drive sprocket where it is extremely hard to get to unless you lay the bike on it's side.

It is reasonably effective, and doesn't benefit as much from a reed valve as a Commando.

That exit pipe joins the tank vent at a curiously shaped y-pipe in the battery area under the seat, then exits out a long pipe to the rear fender near the tail light.


Ah, excellent, thanks for filling me in, Grandpaul. I must delve inwards and find the exit of the crankcase breather and the Y shaped pipe. May I ask a further question - later pre-OIF twins had that vent hose from the oil tank along the left side of the rear mudguard but I haven't noticed it in photos of earlier years like mine. Since I'm not sure if the venting arrangement on mine is stock or what I will find when I get underneath, where does the oil tank vent to on your '67, or have you modified yours?

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Re: Another T120 added to the fold

Postby grandpaul » Fri Apr 21, 2017 9:58 am

It was/is just a plain rubber hose 'till the D-shaped ones came out (69/70?)
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