2003 polaris 700 atv motor is blown want to put in a 600 will it work with no problems
A 600 ATV motor may not be that effective to your vehicle. This is because the motor may not achieve the same functionality as the 700. You can just replace it with the 700 or a higher or consult a mechanic for more inquiries.
I don't think the motor mounts will line up. So I say no
if you manage to actually fit it on the frame (the mounts probably wont line up), it'll kinda be a pansy compared to what it was before.