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三r=nt, Who simply said, ′.Go for it, mate:’Off went a dummy set

of engine cases to Italy.

Wh=e Ieny waited for the frame - almost a year - he select-

ed a we=・PreServed set of 1971 BSAA7うR 4-SPeed engine cases

塵rc'm his parts stash and began building the engine. The idea

iEas tO get aS muCh power as possible while still being able to

関n On PumP gaS. The 930cc engine was built to fu11 race specifi-

Ca〔ion言ust without the high-COmPreSSion 1 2‥ l pistons. Instead,

9 5-1 pistons drop the compression down enough to allow 92

a⊂:ane fueL With no fear of overheating or seizure.

Å lightened and stroked crank uses Carri=o rods for strength

a[ high rpm. The stroke is raised 9mm to 79mm The TriplesRule

qiinders (triplesrule.com) are forged and ove「bored 5mm to

S部t larger pistons. The cylinders are much stronger than stock,

uth fiming that looks just like the original. High li庇, longer

血ration )ohnson 380 cams complement the stroker kit and are

mtched to lightened stock rocker ams and tappets

The cylinder head was re-maChined to suit by Triple Tecs

CEトOWner Charlie Bames and the experts at Branch-○’Keefe

鴨branchokeefe.com), With new valve seats, guides and valves.

同en the combustion chamber was carefully massaged to

徴〔ract optimum power from the classic hemispherical shape.

The inlet and exhaust por[s were re・Shaped to suit oversized

副et and exhaust stubs and polished to a mirror finish.

刃l the engine cases were machined to ensu「e proper fit and

Sea!ing (helpful when you have nine separate case sections)

甜d treated to Triple Tecs’finishing process for continuing

ged looks. Hidden inside, lightened gears drive the cams and血e high-OutPut Oil pump, and a digital皿-Spark single-fire

ignition from Australia 「eplaces three sets of Lucas contact

bfeaker points.

丁he Lucas altemato「 however′ remains, Since it works just

fhe to charge the modem川Itra-1ight Shorai lithium-ion battery,

冒hich is mounted under the seat hump.

Lost in the detail§

One of the weak points of the BSA什riumph triples is the

Single-Plate dry dutch. The clutch was originally based on an

automotive unit and made of cast iron, and the clutch shock

absorber, a SeParate Part, Weighs about as much as a complete

MV Agusta dutch A TriplesRule aluminum dutch saves 3

POunds, and it’s fitted with an angular・COntact release bearing

designed not to overheat and fai獲like the stock unit is known to.

It also comes complete with a drive ring for an electric star[er

as used on the 1975皿umph T160 modeL Which featured BSA-

Style sIoping cylinder cases.

A tiny star[er and solenoid f「om Dave Madigan’s MAD

Components (mad・COmPOnentS.COm) saves weight over the

StOCk T160 Lucas parts. However, OWner Brent thought the

Starter/solenoid looked ‘′as though it belongs on a 19うO Morris

Oxford:’Tb fix this, he commissioned a streamlined alloy cover

from metal maestro Evan Wilcox (Wilcoxmetal.com), Which

Brent finished and polished himself.

Improving the clutch even more, Ieny added a TriplesRule

alloy dutch shock absorber to Iose even more weight, and

then modified the release point, matChing it exactly with the

thickness of the dutch plate to reduce clutch lever pu11 sub-

Stantially.

The stock 4-SPeed gearbox pieces were replaced with 5-SPeed

PartS, a Straightforward conversion on the BSA requiring only

a little machining, although almost every gearbox component

must be replaced with post・1973 components to ensure reli-

ability. A dose・ratio gearset f「om Triple Cydes (triples.co山k) in

the U.K. made the gearset more suitable for high-SPeed work.

Tb add the frame・mOunted oil cooler工abs were welded on the

frame by TC Fabrications of Diamond Springs, Calif. Thankfully,

the Magni frame has a vertical section above the cylinder head

area that is just the right size for mounting the cooler.

The frame detailing by Magni is impressive言nduding items

www.Moto「cycleClassics.com　コ5

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