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Difference between revisions of "Yamaha TA125"
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The frame was quite similar to an AS-3 unit, though produced as a racing special, featuring different looking top rails and other modifications such as removal of un-necessary lugs and strengthening the unit to handle the rigours of a racing environment. | The frame was quite similar to an AS-3 unit, though produced as a racing special, featuring different looking top rails and other modifications such as removal of un-necessary lugs and strengthening the unit to handle the rigours of a racing environment. | ||
Motor-wise, Yamaha chose to keep the basic form of the AS-3 cylinders and heads. The only modifications were altering the porting and chrome lining the bores, changing the exhaust securing system to springs from bolts, and also changing the [[compression ratio]]. This combined with new exhausts, [[piston]]s, 28mm carbs, close ratio gearbox and a Hitachi CDI ignition system ( visually identical to the TZ units ) boosted the output to a competitive 24bhp at 12,500rpm. Heavier clutch plates, strengthened | Motor-wise, Yamaha chose to keep the basic form of the AS-3 cylinders and heads. The only modifications were altering the porting and chrome lining the bores, changing the exhaust securing system to springs from bolts, and also changing the [[compression ratio]]. This combined with new exhausts, [[piston]]s, 28mm carbs, close ratio gearbox and a Hitachi CDI ignition system ( visually identical to the TZ units ) boosted the output to a competitive 24bhp at 12,500rpm. Heavier clutch plates, strengthened [[crankcase]]s around the main bearing journals, and the primary gear being secured to the crankshaft by key/keyway and nut rounded off the modifications to the motor. The TA125 was a 5 speed though there were a few factory 6 speeds around. There were 7 gear kits available, for road use. | ||
Production of the TA 125 ceased in Nov.1974, marking the end of Yamaha's air cooled 2 stroke production roadracers and the beginning of a five year wait for another 125 roadracer, the [[Yamaha TZ125|TZ125]]. | Production of the TA 125 ceased in Nov.1974, marking the end of Yamaha's air cooled 2 stroke production roadracers and the beginning of a five year wait for another 125 roadracer, the [[Yamaha TZ125|TZ125]]. | ||