Change bikes - Go to a real GP bike
You're missing a real easy way to have the best.
Buy a MotoGP 125cc bike. New, they were $10k, with spares $20k. Weight 155 pounds, 40hp.
You can pick one up with tons of spares: pistons, cylinders, gear sets for the six-speed trans, etc. Prices seem to be in the $2-4k range, which is the same price as a used Ninja. But you get a sophisticated race bike with nothing that needs to be done to it. It will run with the Ninjas, but brakes and turns for real. If dragging knees is important to you (seems to be on this forum), this bike will let you drag knees, boots and elbows.
That's what I did for my boy at that age. I told him, when that bike had taught him everything it could, he would know exactly what bike to race. But he surprised me, by staying with it until he quit racing. (job and family)
It was really fun watching him stuff 600's in turns and out braking them by a mile. But the best thing was putting it back in the truck - no ramp! Lift up the front, place on tailgate, lift up back, done.
Just some thoughts,
cheers,
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