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1964 TR20, Triumph Tiger Cub

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1964 TR20, Triumph Tiger Cub
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1964, Triumph Tiger Cub - TR20
Engine No; TR20 -95284
Frame No; T -95284
Special Thanks to: -
Sammy Miller, Motorcycles ltd.
Martyn Adams, SERCO
Tom Reynolds
last but not least.......Dick Varcoe.
 
Alas, the machine no longer belongs to me.  Nick is now the proud owner.  Good luck and enjoy owning and riding it.
 
 

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'Click' on pic to enlarge

Bought as a pile of bits in October 1997.
Engine
Stripped down and rebuilt, all bearings and gaskets replaced [except the big end bearing, Alpha bearing].
Barrel &  piston Std. size.
Gearbox Sprocket
14 Teeth
Rear Wheel Sprocket
64 Teeth
Wheels
Rebuilt with new spokes on original hubs, [blasted and stove enamel black]
Heavyweight Front Forks
New Stanchions, bushes and seals. RM-21 Alternator Assy. Supplied by SERCO, [Martyn Adams].
Sammy Miller Bits & Pieces
Swinging Arm Kit, is longer and wider than std. gives greater clearance for 4inch x 18inch rear tyre [modern trials tyre].
Alloy chainguard
Control cables
Trials handlebars [7/8"]
Boyer Bransden Electronic Ignition
Pirelli MT43 Trials Tyres [although I would n't recommend them- [too hard]
 
Misc.
Paint; Hi-Fi Scarlet / Silver Sheen
Stainless Steel fixings.
 

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Background
The TR20 and TS20 were specialist trials and scrambles developments of the T20SS model.  Introduced in 1962 they were described as 'Works Replica' models, as near as could be bought to the machines used by the factory riders.  Both models had: -
  • upswept exhaust system. 
  • crankcase undershield
  • short competition seat
  • polished alloy mudgards
  • no toolbox, prop or centre stands
  • heavyweight front forks without top covers
  • wide handlebars [braced on the TS20]
  • a shortened left footrest bracket carrying the rear footbrake pedal

Neither model had lights but a rear number plate and front competition number plate were available.  Also available were a large range of gearbox and rear wheel sprockets.

The smaller [sports] terrier fuel tank was used and ignition timing was by Energy Transfer.

The total number of TR20 built was; 526 and the TS20 build total was 367.

source; Mike Estall TRTS20/2

Specification

BORE & STROKE
63mm x 64mm
BARREL TYPE
'Oval' up to #99999, then 'Square' from #101 onwards
COMPRESSION RATIO
TR20  7:1  -TS20  9:1
CAMSHAFT
Sports 'R' Type
VALVE CLEARANCES
Inlet 0.002",  Exhaust  0.004", [cold]
IGNITION TYPE
Lucas Energy Transfer.  RM 19 Alternator
DISTRIBUTER TYPE
Lucas 40846, [1962 only]  Side points 1963 onwards.
CARBURETTOR
Monobloc 375/44 for TR20 and 376/272 for TS20
GEARBOX RATIOS: - TR20
Teeth on Mainshaft:-
Teeth on Layshaft:-
- Wide Ratios. 
1st- 16t.  3rd- 25t.  2nd- 20t.  4th- 29t.
1st- 29t.  3rd- 20t.  2nd- 25t.  4th- 16t.
GEARBOX RATIOS: - TS20
Teeth on Mainshaft:-
Teeth on Layshaft:-
 - Extra close Ratios
1st- 16t.  3rd- 23t.  2nd- 20t.  4th- 25t.
1st- 29t.  3rd- 22t.  2nd- 25t.  4th- 20t.
WHEEL & TYRE SIZES; 
FRONT: -
REAR: -
TR20 & TS20
- Both are WM1, 2.75 x 21
TR20 - WM3, 4.00 x 18
TS20 - WM2, 3.50 x 19
SPROCKETS & CHAINS: -
Engine 19t,  Clutch 48t, [3/8" x 7/32" x 62 links, Duplex]
Gearbox 16t.  Rear Wheel 58t, [1/2" x 3/16" x 119 links]

LINK to my Cub on the Cubsite Forum.

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