i was siting down one day and i noticed that i had an old XL700 hull(no engine) just lying around doing nothing and i was thinking.... Could i make a Street Bike engine (with gears and all) fit and work inside this hull... I want to do it but i have no clue where to start....... i know i will have to remake the engine mounts ............anyone got any ideas/tips

Obvious question: why try??? Plus, how you gonna cool it???? Then, once it is done... if you want to sell it, how much is it gonna be worth?

Wouldn't it be better to reach out and find a used XL700 engine and enjoy it for what it is????

its being done already
http://www.rapidacceleration.com/hon-doo-2.htm

theres alot of work involved honestly and i don't really think theres major speed gains but it should still be pretty cool.
I'll have it done by next years mudbug nationals.

Do you aactually have to shift thro the gears on the cbr ski? What is the top speed?