Help Me Guestimate JE Piston or Not? Klx250, 300, 331, 351?

[TOOPH]

Im going to look at an 06 klx250s with 12500 miles in 4 hours. The guy has only had the bike for 2 month... and well... the price is $2200. It looks like it was only ridden on the street. My plan is to put a big bore 351cc and pumper in tight off the bat. I was looking at the pictures and noticed a JE piston sticker on the bike... i didn't make the connection before.

What are the chances it already has a big bore in it? Do they make 250cc replacements from JE, or just the big bore. I'm getting a little excitedat the though that it could already have a portion of what I'm planninh to do to it. Ahhh! ?

[TOOPH]

Is their any way to tell from the outside?

[hadfield4wd]

No way to tell from the outside. Yes JE makes a stock bore piston. My KLX came with a 340 big bore and didn't know it.

You can get stickers for anything. I have Ricky Stator stickers and could put them on a bike that doesn't have one. I wouldn't count on a sticker telling you anything.

If the guy claims its a big bore he needs paperwork to prove it

Edited April 25, 2016 by hadfield4wd

[jalopyguy]

I guess you could take the spark plug out and use a borescope to look down into the cylinder.  You might be able to tell if it had a JE piston that was bigger than stock....or not.  Really the only way to know for sure is to pull the head.

[StealthDingo]

Is their any way to tell from the outside?

 

Call the company. I had the same situation with my KLX when I saw the B&B sticker on the cylinder I called for a long shot. He told me they actually stamp an identifier on the outside of the cylinder for reference. Its worth a shot... it worked for me!