Vintage Dirt Bike Q & A

I have a 74 MT 250 elsinore motor and wanted to know if I could use the head and cylinder on my 73-74 cr 250.? Are they the same or different? what other parts are interchangable? My serial # is Mt 250E 1001029

They are different but you can interchange them. A major difference is the MT intake manifold uses 2 bolts instead of 4 so you have to use it and an MT carb. Mostly 73-74 CR250s will work with 74-76 MTs.

CR rings/pistons changed in 75 but I think you can get away with using a 75-76 CR piston in a 73-74 CR or 74-76 MT if you right rings as the wrist pin and bores are basically the same.

Thanks for the info. I looked at the MT intake and it has four bolts just like my cr. Are the ports any different and is the bottom end gears the same? thanks

If you have four bolts holding on the intake and a 34mm carb instead of the 28mm MT carb then you have a 73-74 CR250 cylinder on there already.

thats sounds like what I have except I don't have the carb. but the intake looks exactly the same size as cr's. How do I tell what bore the cylinder is on? what MM is the standard bore? Thanks

If you go to the Wiseco Web page they list sizes. 70 mm is standard bore

http://www.wiseco.com/PDFcatalogs/CB05_honda.pdf

_________________
74 MT-250
06 Husky TE-450