Having had a couple of supermonos myself, l can see why you would want one along side your strokers in the garage.

I would be looking to fit a modern 450 single, probably a mildly tuned CRF450, and the X version as it has slightly higher gearing as standard, which would make a more pleasant mono. Still mental mind.

The honda RS250 chassis is very popular, so the NSR shouldnt be too different for this project and straight forward.
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Russ

MC21SP