well with that in mind, what would be the best swap that would give me the most power without having to replace the frame. i would be fine replacing the rear suspension, but am not too keen on the forksHello and welcome. Anything can be accomplished with enough engineering and determination.
I think the question is more as to why a 450X engine in a 250L chassis that is really more road use related. The 450X is really not a good road engine. It runs very hot and has to have air flow on the radiators to keep temps in check. You can add fans but the 450 really is by far happiest in off road uses. It has a close ratio transmission that is geared for off road uses. It is like putting a high strung racing engine in a Toyota Corolla --- why would you. That said, if it's your dream to do it than it certainly can be done. Get out the torch and saw and start cutting and welding.
I do believe you're correct. I would be more happy with a bike that have everything worked outIf it was me I would just consider changing bikes to what you want.
But if you feel the change to "with relative ease with the CBR500R's" then that would be the direction to go. The CBR500 engine in that 250L frame would give you all the power you want. I don't think the results would handle very well with the much higher CG of the 500 engine in the 250L frame but it certainly be powerful. The suspension would need to be reworked for the additional weight also. The brakes on the 250L would be far less than the required for the weight and speeds of the 500 engine.
I recommend rethinking what you wish to achieve and what bike it original configuration will achieve that goal. There is an incredible amount of engineering that goes into each of the models. You will be happier with a bike that someone else has worked the bugs and glitches out of then dealing with the problems trying to invent your own model. Resale of a chopped up bike it another problem.
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