71,744
edits
Difference between revisions of "Yamaha TA125"
m
Robot: Automated text replacement (-compression ratio +compression ratio)
m (Bot: Adding {{Yamaha}}) |
m (Robot: Automated text replacement (-compression ratio +compression ratio)) |
||
| Line 5: | Line 5: | ||
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 crankcases 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. | 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 crankcases 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]]. | ||