The NX250 afaik is a liquid cooled engine that wasnt used in much if anything else...the only way I think you will increase the power beyond what has already been mentioned is try and get a big carb and set that up...
Unless you can get a big bore kit for the engine...
The NX250 is quite a nice bike for its size.
But the market is not flowing with "Go fast" parts for it.
However a less restrictive silencer/End can, combined with an adjustment of the carb jettings, could very well produce a few extra horsies
In fact, I would assume the NX250 would respond to the same changes as the larger capacity RFVC engined Hondas.
Edit: Praise the Man!
Honda have OEM parts for tuning!
Honda had a special model called AX-1
Just get your local Honda dealer to supply you with the
camshaft and carb jets from the AX-1
3 additional HP
>Another version of Honda NX-250 was Honda AX-1. Using the same chassis as the NX-250, came standard with alloy rims, aluminum Pro-Link rear suspension and dual round headlights, different camshafts and carburetor settings. AX-1 outputs 29 HP at 8500 RPM at 11 to 1 CR and 2,4 Kgm torque at 7500rpm.<
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