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BSA "Big Valvc” cnginc has maMmurr-sir.ed valves, strcamlincd ir.take ports, and high-compression. hemisphei ical-dcsi gn alloy cylinder hcads for top eflieiency and high horsepower output

~TBSA super rocket

O.H.V. Sports Twin

With famous “357” full-racc camshaft

New power-jet exoaust system on Rocket g.ves bet ter ex-iractor elTect, lessens back pressure, inereases horsepower. (Optional if available at time of order).

Keal racing performance in the best looking, most handsomely finished spons rnotereyele on ihc highway! New gcar ratios with lower, quick-cff-thc-linc bonom gear make this big, powcrful mctorcyclc, morę than ever, the most thrilling sports job on two wheels! (Model illustrated bas twin pipes and muffiers).

l-.nglne: 646 c c. (40cubcinches' overhead-valve four-stroke, with fully cncloscć valvc gcar. Spec al high-duty, vgriab3c-ratc valvc springs. Aluminium alloy cylinder head. 9.0 io I comprcssio.n ratio. Łquipped with “35?" r'i:ll-racc camshaft. Cr&nkshaft drive sidc suoportcc by new HolTinan heavy-duty roller bear.ng; timing sicie supported by heavy-duty bi-nielal bearing, new niicro-babbit connecting rod bcar.ngs. single camshaft with gcar drivc to .magneto, dry sump labricction with doublc-gear type oil pump. oil tank capacity 5i pints. Śpecial cros>-over exhaast Leader with new Power-jet glass-pocked muffler.

Carburctor: 1,⁵2" A ma! V.onoblcc carburc-tor. Largo capacity air clcarcr. Twist gr.p th roi tle cent roi. ai: slidc operated by lever.

Transrrassion: BSA 4-spccd gearbox wilh positive s:op foot control. Gear ratios 4.52 -6.00—?.94 and 13.1 -1. new clalch with solid forged center and bondcd lini.ngs running on hcayy-duty roller bcarirgs. Prirrary chain k* X .305" runn ng in oil-bath chair.casc w.th doublc-cani cush drive on engine shaft; rcar chain x g"-Totally enclosed cltaircase suppliee at extra cost

Igniticn and Lighting: Lucas magneto with waterproof cnd-cap, manuał control on hancilcbar and separate chain driven 6 volt C.V.C. dynamo; diameter headlamp with pre-fbeus light unit and piło; light. New 140 m.p.h. specdcnietcr and tacho-meter mounted on twin bracket. Electric hom. Stop and tai! light inccrporating rcar rcllcctor. 12 amp./hr. batlery. Sports type headlamp mounting.

Fuel capacity: 3 galion or 4 galion op-.ional (as acailable at time of order).

Tires: Utnlop Univcrsal 3.25—19 front; 3.50—19 rcar.

Hrakes: Fuli width hubs of spccially scl-cctcd iron alloy with powcrful 8" diameicr front and 7" rcar brakc. Kingcr t.djustments or. brakc eables. Brakc plates polished to high lustre.

Suspension: Hydraulically-controlled front forks with chrome covcrs and rubber dusi sleetres. Hydraulically-controlled swngirg-arm rcar s.ispcnsion.

Frame:    Intproved weldcd double-tube

cradle frame; spring-up center stand, sidc stand, key-operated stcciing head lock, quickly-detachablc rcar whecl; new style improvcd dualscat, pillion footrests.

Flnish: Deep lustre Mctallic Red tank with large chrome pancls. new brill ant tank badges, chrome fendens, black frame.

General dintensions: Whcclbasc 56“; ground clearance 6'; oserall length 85J "; dry weight 423 Ibs.

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