Cycle News is a weekly magazine that covers all aspects of motorcycling including Supercross, Motocross and MotoGP as well as new motorcycles
Issue link: https://magazine.cyclenews.com/i/126030
•........... .. .. ...•• ....... ..... . ~ - .. . . ....•. .... ... .. ... CIRCLE/-ESLRni' E 500cc SPEEDWAY ENGINE better opportunity than In the Lightweight G P class. The small, high revving Yamaha T A's remain the kings of the class, but an y backyard enthusiast with an old 200 Suzuki, 175 Bridgestone, CT-175 Yamaha, or 175 Can-Am has a chancer-A fighting chance to bre ak the domination by one brand and do it his way . The 175 Can -Am represents the privateers best hornebrew co ncoction. The . Valcourt, Quebec product was designed for the dirt, but with its un ique ro tary engine churning out the punch of a 250 the new rules in Ama te ur roadracing fit it like a glove. Up in the cold winters of Quebec, wh ere 175 sin gles can also ru n in the 125 GP class, development engineer Ken Rosevear put his spare time to usc and came up with the ul timate Lightweight GP or 200 GP (if yo u race for a provincial gcntleman'c club) weapon . Utilizing the stock Can-Am 175 rotary valve engine, clutch, crank, piston, ignition and hand building a one-off frame, water cooling system (thermo-syphon) , discs, tank and seat the Can-Am tips the scales at 193 pounds and the dyno at 36 hp. The sus pe nsion system is the standard Betor forks and triple clamps with several inches taken off the tu bes to settle the 52 ~" wheelbase in with a ra ke o f 28~" . The rear en d is suspended on 12 y," S&W shocks o ffering up 3y," of rear wheel travel: Can -Am has been secretly working on a watercooled twi n street bike, but the simplicity of the develop men tal Can-Am I 75 road racer almost makes the time spe nd R&l,)ing new designs wasted effort. Can -Am could build water cooled versions of their poten t dirt engines in modem hanger frames and double their market at a tenth of the co st . Why wait for them to build it for you? Become a full -fledged privateer and backyard . engineer by building one yourself. • e I Specifications Wheel base Rake . . . . . Weight . . . Suspension Fro nt : Rear: . .• . • .. . . .. . •. . . •.• • • • 52 %" .. .•. ... .. . . . . ... . . . . . 28 %" • .. . . . .. .. • .. . . .. . . . 1931bs. CIRCLE INDUSTRIES Introduces the Weslake Speedway engine. this engine has been designed to combine the power and torque advantages of the latest four-valve cvllnder head technology with simplicity. reliability, and light weight. Ideal combustion chamber and valve port shapes are used In conjunction with a push rod valve train that employs needle roller cam followers. A convent ional slght·feed, total-loss lubrication svstem Is fitted. this compact engine can replace existing Jawa engines In speedway frames without modification. For additional specification and Info rm a tio n contact: CIRCLE INDUSTRIES Dept CN , 17901 Arenth Avenue C ltV of Industry. California 91748 Telephone (2 13) 965·1622 Betar's shortened 4 % travel "" S&W 12%" dampener 3%" travel . at rear axle Seat height •• • .. . .. . ••.• • • . • • . .. . 28 %" Gas tank •• ••• ••••. .• . . . . .. .. . . 2 % gals, Engine .•... . .. . . . • •. 175 ce liq uid coo led Rad iat or cap. . .. . •.. . . . . . •. • ... • . 3 q t• . Carburetor . . . . . .. . . . . . . • . .34mm Mikuni Igniti on . . • . . . • . • . • . .. . . . • . • • Motoplat Tra nsmission Close rati o 6 speeds Fu el ..... •.• .. Pre-mix fuel Castro l R 20·1 Horsepower . . . . . . • 36HP .redline 11· 115 00 Wat er • • • . . • • • • . • . The r mo sy ph o n cooling Br ake s .•.. .•• .. • . . . . • • . Mechani cal d iscs Tir es _300-18 Dunlop fro nt 300·325 18" rear $529* Road Toad (99) Road Toad (99) . .. .• . ...•• .• • S 529 .00 DIrtSQt. lrt (920 l S 399 .00 DtrtSqwt(Ol) Su~Rat (98) S 499.00 . .. . . ... •. •• •• S 695.00 eombot('J5) J 549.00 SlJpt' r Combat (9n . . . . . • • . • . S 745.00 * 250(71) , $1195.00 PrIce, MIt