Hi i was looking at the "What model do i have link"and mine is a mk2.2.Engine and frame start with MD24-13 so what the difference between the models is my model a mix of a mk1 and mk3 ? By the looks of mine the engine has never been apart so at what miles will it need a piston/rings its on 21k kms at the moment also what are the signs of poor compression it starts first kick whatever the weather but does not seem to have alot of compression to me

See - http://www.crm250.com/history.asp

Has the basics but they are the views of one person there are others expressed over the site.

I was of the understanding that it's a mk2 with blue decals and a couple of slight revisions probably uprated bearings but that's just my view

Your engine and frame numbers are both for Mk2.2. Your post is a little difficult to understand?