426 piston

[randytbo98]

yz 426 trying to decide on a piston. which brand? 13.5 or 12.5? would i benefit from the higher ratio for a trail/gravel pit bike?

[davidl9999]

13.5. Those will still run on pump gas. I don't have a brand preference although I generally go OEM for internal parts when possible. (obviously that's not the case here).

[randytbo98]

im looking at a je in the tt store. will they go in without having to change anything? are they worth getting??

[davidl9999]

I'd expect it to go in without changing anything mechanical. Definitely will need to go through the jetting routine when you're done (might want to check with JD for a kit). At least make sure the cylinder bore is straight and true and the plating is good and honed for the new ring. JE has a pretty good reputation. Never used their pistons myself.

[randytbo98]

its gonna be slid into a brand new oem cylinder with a hotcams ex cam

[426 NOOB]

its gonna be slid into a brand new oem cylinder with a hotcams ex cam

go for it.

[grayracer513]

I like CP pistons, but JE is also excellent.

[642MX]

yz 426 trying to decide on a piston. which brand? 13.5 or 12.5? would i benefit from the higher ratio for a trail/gravel pit bike?

Get yourself a Wiseco 13.5:1. I had one and loved it.

I don't think anyone makes a bad piston, but I've used Wiseco's for years with great luck.