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 Post subject: MR 250 vs. MT 250
PostPosted: Mon Dec 13, 2004 8:46 am 
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Joined: Mon Dec 13, 2004 8:20 am
Posts: 3
Location: Dunkirk, MD
My question is this: I have a MT 250 motor that I purchased for parts for my two MR 250's. Are these engines compatible, if not, can someone explain what is different between these two?

regards, scott


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PostPosted: Mon Dec 13, 2004 9:31 am 
The cylinder and head are not compatible. The internals like piston, rod, etcetera can be interchanged.

The MT cylinder uses two manifold bolts, has four case studs that go all the way through the head.

The MR cylinder uses four manifold bolts, cylinder bolts directly to the cases and the head bolts to the cylinder.

In a pinch I think you can interchange heads. The MR has an extra stud but the rest of the layout is the same. You could probably drill out the MT head or remove the stud.


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 Post subject:
PostPosted: Tue Dec 14, 2004 10:41 am 
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Joined: Tue Aug 31, 2004 1:44 am
Posts: 8
Location: Maysville, AR
you can also use 75 -76 cr250 engine parts including the head and cylinder. a cr250 cylinder and head will give it a shot in the arm.

_________________
1974 Mt 250 elsinore-my first elsinore
1975 CR250M1 Elsinore
1979 CR250R Elsinore
1971 yamaha RT1 360 mx


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