Is it possible to use a stock 400ex piston and bore a 250ex to fit the 400ex stock piston?

How about using the 400ex piston on the 300ex?

What size is the stock 400ex piston (in Millimeters?).

I just put in an 88mm piston in my 400ex... making it a 426. I have no use for this stock piston and thought about selling it... only if it would work in other machines. Anyone need it?

 

No way it will work.
A 250ex is 2 valve .. the 400 is 4 valve... and you could never go that high on the stock sleeve..

 

....ok-

Would it work in a 300ex then?

 

Nope

 

no the 400 piston will not work in the 300 because the 400 is a radial valve design and the 300 isn't[E=]elloco@netins.net[/E]

99' 400ex
01' 400ex
87' mojave