400 FSE rebuild..will a 450 piston fit with rebore

[jason r]

I have decided to do a full engine rebuild to my 2002 Ec 400 FSE this winter.

So basically will the 450 piston fit with a rebore to the cylinder and are all parts from the 450 engine interchangeable with the 400, ie head, valves, clutch etc .

[gasgasman]

GasGas was offering a 450cc kit to people that bought the 400cc bikes here in the U.S.
I'm not sure what came with the conversion.

[jason r]

Thanks. Looking at the parts manual today, I can see that the only difference in part numbers is the Piston, Cylinder and Gasket. So hopefully I should be able to bore out my cylinder and fit the piston which looks like what GasGas have done from the factory, a bored out 400?

[gasgasman]

This may help some(link below). Looks like the 450 kit is a bolt on deal.
You would have to get a liner put in if you bore out your cylinder.


http://www.dirtrider.net/forums3/tex...c/67908-1.html

[Vinny]

Originally Posted by gasgasman

This may help some(link below). Looks like the 450 kit is a bolt on deal.
You would have to get a liner put in if you bore out your cylinder.


http://www.dirtrider.net/forums3/tex...c/67908-1.html

link didn't work.