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93 engine on 91 frame yz 250

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Is the exhaust port on the engine the same in 1991 as it is in 1993? In 1992 they changed how the exhaust is routed and I would like to put a 1991 exhaust on it if I know the exhaust port on the engine is the same.

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does anyone know i currently have the wrong exhaust i bought a 93 exhaust and its routed differently so i would like to buy the 91 if it fits

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I have a 1991 wr250z frame with a '97 yz250 engine crammed in it. The guy that did the conversion used the 91 pipe for routing reasons and actually modified the end of it with a dremel to make it work with the newer motor. Seals up fine and nothing weird going on with jetting or running conditions.

Judging by the cuts made, it looks like he just had to cut the flange on the expansion chamber off and it fit in.

Good luck, hope that this was of some help.

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