Triumph Clutch

[Nourish]

Hi There. I'm piecing together a plunger (or rigid if I can make a subframe) from auto jumble and E bay finds, I understand that a Triumph 3 spring clutch is a good upgrade - Which Triumph clutch would this be? - I have a T140 clutch - would this work?

[Triton Thrasher]

The Norton clutch was a popular modification.

[wilko]

T140's are triple or double row aren't they? It's been  30 years since i had one.

[Nourish]

Aren't the triplex and duplex chains the same pitch etc just that one has an extra row? - I could just machine off the third set of teeth - if it were the right clutch to use that is

[orabanda]

FWIW, the standard clutch in my rigid and plunger bikes is very good; light, smooth, and no slippage.

I have japanese clutches in all my swing arm BSA's but very happy with thye standard clutch in the earlier design.

[muskrat]

I agree, my plunger clutch is lovely. Light, smooth and never slips or drag.
Which box are you using? The S/A box has a taper will need an adapter (http://www.ebay.com.au/itm/BSA-A7-A10-CLUTCH-HUB-ADAPTOR-42-3170-MADE-IN-UK-/301013292103?pt=UK_Motorcycle_Parts_13&hash=item4615ca5447) to fit a 4 spring.
The plunger box has a spline and a Notrun clutch (not sure of model) will fit.
Cheers

[Nourish]

I have a triumph 3 spring as I said - if it fits that would save me buying something else, Now Norton - weren't all of the singles and heavy weight twins a single row chain except the commando which is triplex - I might have one of those too!

[Briz]

The Commando clutch is triplex and will fit on the plunger mainshaft. But its too big for the plunger primary case.
The AMC /Norton clutch which was fitted to most larger models from the late 50s to the late 60s will go in. Single row chain.
Bit pricey as they're much loved by racers.
There was a duplex version in 250 Matchlesses; I used one once - had to swap in the centre spider from the single-row clutch. Sprocket size is smaller so will alter gearing.

[Nourish]

I dragged out the extremly heavy boxes out of the corner of the garage and uncovered the Commando and T140 clutch's.
The T140 clutch centre is tapered so won't fit on the Plunger mainshaft and has 58 teeth. The Commando centre fits the mainshaft and has 57 teeth - so how many teeth are on an original plunger clutch basket/drum?

[muskrat]

54 teeth 3/8"duplex, 80 link, 27 teeth engine sprocket.
Cheers