Will a 1000 cbr motor fit in 600 frame?

Yes, it is possible to fit a 1000 cc engine into a 600 cc frame, but it would require extensive modifications and would not be a simple project. It would not be possible to simply bolt the 1000 cc engine into the 600 cc frame due to differences in the engine mounts and other components. Additionally, the 600 cc frame may not be strong enough to handle the increased power and torque of the 1000 cc engine. It would be necessary to reinforce the frame and make other modifications to ensure that the bike is safe to ride. It would also be necessary to consider the impact of the larger engine on the bike's handling, braking, and suspension, and make appropriate modifications to ensure that the bike is still safe to ride. Overall, this is a complex project that would require a high level of skill and expertise.