2 replies to this topic

[gasgas]

Hi,
i have a pro 2002, the mother all pro's, and the dealer is having a hard time to find me the original piston.
The original piston comes with a "dyke"-ring and normall ring.
I asked him to give me a normall piston but there seems a bit of a confusion abouth that the the cilinders differ from 2002 untill 2008, or so.
Is he correct? And also are there pistons nowadays who has intake windows in the skirt?

Thx

[PeterB]

Hi there,
I am not aware of any glaring differences between the 02 and later 250 cylinders. I am almost 100% sure that you can use the later style piston in your 02 cylinder without any problems, I don't think that you would find one of the older style pistons with a dykes style ring. From memory, the later model 250 just has transfer port skirt cutaways. I know what you mean by having the intake port cutaway in the back of the piston, it's not for timing of the inlet charge with a reed v/v motor, it may be to assist in scavenging after combustion. I have fitted later non intake skirt cutaway pistons to much older GG motors that previously had such an intake window in the piston, without any loss in performance. Give it a try.
Bye, PeterB.

[gasgas]

Peter, a little late, but thx for the answers.
Rgds
George