YZF-R125 (180cc) – Swapping out the ECU to get an RPM limit increase, and hopefully higher top speed

So my bike keeps topping out at 89mph at which point we’re still on power but bouncing off the limiter.

Today we’re attempting to fit another OEM ECU, but which has been tweaked to increase the rev limiter to 11k.

If it works, it should increase our potential top speed to around 96.7mph – which would be a significant improvement, and also makes me wonder whether 100mph might actually be possible.

Will it work though, or will it result in fiery engine death?

Only one way to find out…

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