Titanium Valves are better for this junky fuels these days. The fuel doesn't deposit to the valve. and They're StRoNgEr dont matter when a piston hits it a 6 grand tho. Just My .02

 

Its simple physics, the less roatating mass the faster it can rotate. The yfz was made to rev, the raptor was made to make torque. BTW last i checked high comp pistons dont increase revs.

 

the 450 out performs the raptor for that it has a newer, better refined motor, and its overall geometry. The 450, well, makes up for the raptors short commings, its center of gravity is different, weight distribution, etc, etc. You get what I'm saying? Cubes aren't everything, I have a 350 small block that puts out more horsepower than a 396 big block, its just in how its built, and the components that make it. And weight, say its 50 pounds(give or take), on a quad, that matters alot.

 

Want to make it rev try designing a a dual over head cam so there are no rockers shorter stroke TI connecting rod lighten the crank assembly lighten the tranny Ti valves and what ever else you can lighten . Just pull out your magic check book and shake it real hard . Or go buy a YFZ and wait for a 600 big bore kit . probly wont be one but you never know ~~~~~~~~~~~~

 

A lighter flywheel will make it rev faster. I don't see a cheap way to increase the revs as much as the yfz has.

 

Today i was with both a raptor and a yfz. The yfz does not rev to its limit faster. there almost dead even.. I like them both and i will take anyone

 

the rapy was made to rev high, if it was it wouldnt have its torque. if u got it to rev higher, you vibrate the engine into pieces.

 

#!$% crap i meant wasnt made to rev high

 

It's possible to make 10000 rpm small block ford and chevy motors with off the shelf components. Why is it so hard to belive that a Raptor motor won't respond exactly the same way if not better? It's all about lung capacity, let it breathe and it will rev. Of course, all rotating mass must be balanced to very tight tolerances and the valve springs have to be able to overcome valve inertia at high rpm but it's not magic. It all boils down to one question, "how much rpm can you afford?"

 

You can try, but everything in that little SOB is so light you have alot of catching up to do. Easiest way would be to replace the flywheel with a bare bones total loss igntion system. Last I checked though, noone makes one, so you better be darn good at fabricating.