I'd keep riding the bike as it is for now and look out for a 200cc engine as a re-build and transplant option for later on when you have more time. But then it would probably a full re-build to make it work and be worthwhile. I bet if you scour the big bike breakers that one might show up eventually.
The big downside to this plan is actually finding a secondhand 200cc lump. The gains from say fitting a bigger carb or ported cylinder on the 200 engine would probably be much better and more worthwhile. More cc makes more difference IMO than anything else you could do, and so does tuning work. The best way to get another 5-6bhp from the MTX is with a 200cc lump fitted. Porting the barrel could add a fair bit more power, but it would need alot of other bits to make the most of it, probably a bigger carb, and aftermarket pipe etc. Personally i wouldn't go down that route with Your MTX now you have re-built the engine, any by your own admission got the bike running really well again. I also agree with keith that i doubt the open ATAC chamber is sapping much power, and id be suprised if it made a 1bhp difference at peak power rpm either way open or closed.īTW the KMX125 is much faster than the MTX, it's a Kawasaki after all!Įven 12bhp KMX's would do over 80mph on the speedo downhill, and the DTR was never as fast accelerating or could top 70mph on 12bhp like the KMX did in road tests!
(The MTX redlines lower than the MBX engine for some reason, probably due to the manufacturer re-tuning it for less top end power and more midrange for trail riding). I don't think the gearing would let you get over 75mph as i think that is right on the 9000rpm redline. Id expect 60/65mph from 12bhp, and the 70-75mph from a full power engine in decent nick, but with much better acceleration. I have also seen the MTX performance test figure's in a French bike mag, and i think the top speed was 75.5mph and standing 1/4m in 16.8sec. This also produced a figure of 16.7bhp ATW, which is about what id expect for a 20bhp engine with the transmission losses added in. The figure's i saw for an MTX125 quoted were, 12.2ps at 8500rpm on the restricted version, and 20.4bhp for the full power engine.
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