Piston ?

[Rick]

Drop Jim Cook a PM....JAck @ RT&T might have something....Halls....or start at the top of the dealer list and make a few calls...

[Brian VT]

Thanks guys. I tried most on the list but gave up.
I'll try some more.

[Nick]

All i have is a Wossner A

[blitz11]

A less than desirable option might be a re-plate and an A piston.

Just a thought.

[Trailrider]

Just as an aside, I was told a few years ago ( I have a 2001 300) that the stock GasGas pistons are Wiseco made to their specifications. This may not be true anymore but either Jim Cook or Les told me this when I bought a new piston for my 300.
Trailrider

2001 XC300
1998 EC250 6 Days

[Skidad]

Well Vertex does make em for the bike. Someones gotta have one.

EC 300 300 2002-07 72,00 Replica
71,94 22981A
71,95 22981B
71,96 22981C
71,97 22981D

http://www.vertexpistons.com/Vertexlistino2008.pdf

Skidad

[2 strokes 4 life]

Originally Posted by Trailrider

Just as an aside, I was told a few years ago ( I have a 2001 300) that the stock GasGas pistons are Wiseco made to their specifications. This may not be true anymore but either Jim Cook or Les told me this when I bought a new piston for my 300.
Trailrider

2001 XC300
1998 EC250 6 Days

I think it is true. When i was taking apart my 2002 GG EC250 it looks like the piston was machned from a forged block. But, they still dont make + size psitons.

[Brian VT]

Vertex lists 'em but I haven't found one to buy.


The new Vertex I got is 71.93, my bore is 72.02, the new ring's gap is .229
I guess the ideal piston would be a C (71.96). I'm not sure what the ring gap is supposed to be.

Should I run it or have the bore replated/sized ?


B.t.w., there was a Wiseco in there. There was some blow-by, but not bad for 3 seasons/3000 mi. on it. Ring gap was .381, Nikasil looks fine.
I probably should have left it until winter.

[eff]

I am just amazed that there are no B/C pistons out there.

[GMP]

Brian,

If its a Vertex, in the box should be fitment table with the clearances. I think I have one at home, I'll look tonight. Also it might be found on the Vertex site, not sure, probably somewhere.

The thing you have to consider is that a Wiseco is forged and requires (was setup with) larger clearances. A cast Vertex runs tighter clearances. Thats why you go a size up easy. Don't sweat the ring gap.

How was the bore measured? If you don't use a proper 3 point bore mic the error will be greater than what you are trying to determine. You also need to measure it on several points to determine how far out of round it has worn, if any.

As far as OEM pistons, the original supplier was Wiseco up until '04 or '05, then Wossner, now Vertex. Did you call Town & Country, and Jack at RT&T?