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Is there a differnce between the cr250m and cr250m1 cylinder
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Author:  woosh [ Thu Dec 20, 2007 9:22 pm ]
Post subject:  Is there a differnce between the cr250m and cr250m1 cylinder
I just bought a cr250m1 gp cylinder to put in my mt250 I still need a head. Anyway just wanted to know what the differnce between the two bikes was as I also wanted to put on the mossburger reed valves and they are for 73-74. Bikebandit shows the 73-76 bikes all use the same cylinder so as far as I know they are the same. Anyway I need help as I know nothing about these bikes and what was interchangable.
Author:  frohrs [ Thu Dec 20, 2007 11:39 pm ]
Post subject:  Re: Is there a differnce between the cr250m and cr250m1 cylinder
The 75-76 cylinders are not the same as the 73-74. The 75-76 had an up pipe which the exhaust port is on the left hand side of the bike when sitting on it.

The 73-74 exited out through the right side. I'm not sure how the porting has chaged through 73-77 if any. For a good look at a restored 1975 CR250 go to Vintage Factory.com and check it out!

Good luck.
frohrs1
Author:  expat [ Thu Dec 20, 2007 11:49 pm ]
Post subject:  Re: Is there a differnce between the cr250m and cr250m1 cylinder
75/76 have a crude "boost port " or 5th port in rear of cylinder above intake.

The cylinder hold down stud spacing is very different to 73/74 so cylinders are not interchangeable.
Author:  woosh [ Fri Dec 21, 2007 12:00 am ]
Post subject:  Re: Is there a differnce between the cr250m and cr250m1 cylinder
So then I have to use the 73-74 cr250 cylinder on my mt250 its a 75 does that matter?
Author:  Dave [ Wed Jan 30, 2008 3:40 pm ]
Post subject:  Re: Is there a differnce between the cr250m and cr250m1 cylinder
it does not matter what year MT it is.the mt motor along with the 73-74 cr250 motors,the cylinder and head will bolt on.dont forget to get a pipe,carb to compliment the CR top end.
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