Hi All,

 

Im rebuilding a 2002 290cc Sherco,

 

I've noticed on the splat shop site that Splat shop sell an S3 GG 280 piston, which apparently fits, altho there is plently of caution,

 

said piston

 

http://www.splatshop.co.uk/s3-gasgas-pro-280-piston-size-a.html

 

Anyone else used this piston? for an extra £35 i may just buy the standard sherco one

 

Matt

Edited September 18, 201510 yr by magicmat

Well, im not sure, but it could be that S3 makes/did make the cylinders for both bikes. They are, next to most products we know, a big cylinder rehaul and fabricator company.

 

You need the right size, whats on the box is not really important. Read the bottom section of the link you send.

Edited September 18, 201510 yr by crazybond700

yes i read it and comparing to my current piston it seems that the gudgeon pin to top of the piston is smaller, so it will lower the compression ratio in my mind

 

I will talk to chris at splat shop when he is back on wednesday, see if he can shed any more light on it,

 

im all up for saving £40 but not if its a bodge

 

1mm change in compression makes a significant difference to performance

yeah im not really after softening the power etc

 

pretty sure I saw an S3 piston inverted and 'VERTEX' moulded inside.

Beta 270 uses the same piston as sherco, there is an insert that gets changed when they make them. I ran a beta piston in my 01 at 1 stage as the importer who is a friend had a few in the drawer & owed me a favour

Probably best to stick with a Sherco designated piston kit.

Years back, with the early Sherco's, the gudgeon pin centre line in the vertical plane, was different to the GG piston, I don't know if the same holds true to date. And as mentioned earlier, there is a noted difference between the centre line of the gudgeon pin and the piston crown, between the GG and Sherco pistons.

Bye, Peter B.