Joel, a race engineer from Bangalore has done a performance build on his Yamaha R15. The modifications are for the street and not a race and thus Joel has modified his bike keeping reliability, economy and rideability in mind. The bike hits a top speed of 140kmph (tested on GPS and Speedgun) with rev-limiter cutting off speeds at 10000rpm). The engine has higher low-end torque than a stock R15 until 5000Rpm and from then on, it gets into the powerband with a stronger pulse. The bike still returns decent fuel efficiency for the power it generates at around 30-35kmpl.
The modifications on Joel’s Yamaha R15 is as follows : –
Engine : –
- Ported and polished cylinder head with altered port geometry
- Custom valve springs
- Stock Valve sizes
- Reprofiled valve seat area
- Stage 1 spec camshaft with custom ground profile
- High compression set-up
- Modified cylinder and stock piston
- Fine tuning and set-up corrections
- Stock airbox and filter
- Stock throttle body and intake tract
Fuelling : –
- Stock Injector
- Stock ECU + coil
- Altered AFR values for fuelling inputs
Gearing : –
- Stock sprockets
- Stock Gearbox
- Stock Clutch
External : –
- Stock looks
- Hand crafted Tuned Free Flow exhaust
- Full stock weight, no lightening
[youtube:http://www.youtube.com/watch?v=e-m5K1qFmvo 540 375]