Well in a quad mag they had a 800cc FI Honda V-twin motor stuffed into a Honda 450R frame. So I would assume you can put anything in it with some modification.
yes
yfz450 nerf bars fit banshee
yes it will but you need to change the front brackets up
no it wont the only other one that will fit is off the banshee
Yes it will, the banshee engine is just a water cooled version of an RD engine. The bottom ends are identical except for the rotor end of the crankshaft is slightly longer. You will probably want to get the banshee wiring harness also. (Also a RD350LC was built where the LC at the end stood for Liquid Cooled).
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You can fit an engine guard and fit the filter.
A banshe motor is larger than a blaster motor. Will it fit (in the frame) yes, is it a easy fit no. The mounts used for a blaster motor will not match for a banshee motor. You will have to weld in mounts for the motor to sit, which would include lining up the sprockets. We could discuss further if need be. If you need more help feel free to e-mail me at banshee4drag@yahoo.com
650 has 63mm bore and the 400 has 69mm ... don't think it would fit
Got a sex life but I need an exhaust.
Most likely, if the 1998 is a 250 also
The transmission is housed inside the engine cases. The 04 R1 has a redesigned engine that is not the same as the 2000 model, I'm sure it wont fit.