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The frame part numbers are totally different. It is very unlikely a drop-in swap will happen. The '04 frame may need to be modified to accept the '07 motor.
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I have worked at a Yamaha dealer for 15 years the beauty of a yamaha pw50 is it has not changed... for the most part.. it will bolt up. As long as you have the wireing harness/cdi components. Also the throttle cable and throttle may need to be taken from the older bike as well.... keep it easy swap the frame and the frame alone and you'll be ok
for 02 yamaha put the balky yz426f tranny in the yz250's, just for duribility tho....other than that yamaha manufactures might do a slite rejetting, maybe a head compession change, and other small changes. the yz line around that time were great bikes, and still are, so there was really no flaw and nothing really had to be changed because the yz250 of any year was a bulletproof bike. the only flaw i can think of is that these 01 -03 yz"s were only a few years off from having the plug and play aluminim frame, which to me pretty sweet. good luck
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