magicmat Posted September 18, 2015 Report Share Posted September 18, 2015 (edited) 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, 2015 by magicmat Quote Link to comment Share on other sites More sharing options...
crazybond700 Posted September 18, 2015 Report Share Posted September 18, 2015 (edited) 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, 2015 by crazybond700 Quote Link to comment Share on other sites More sharing options...
magicmat Posted September 18, 2015 Author Report Share Posted September 18, 2015 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 Quote Link to comment Share on other sites More sharing options...
baldilocks Posted September 18, 2015 Report Share Posted September 18, 2015 1mm change in compression makes a significant difference to performance Quote Link to comment Share on other sites More sharing options...
magicmat Posted September 18, 2015 Author Report Share Posted September 18, 2015 yeah im not really after softening the power etc Quote Link to comment Share on other sites More sharing options...
worldtrialchamp Posted September 18, 2015 Report Share Posted September 18, 2015 pretty sure I saw an S3 piston inverted and 'VERTEX' moulded inside. Quote Link to comment Share on other sites More sharing options...
tony27 Posted September 18, 2015 Report Share Posted September 18, 2015 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 Quote Link to comment Share on other sites More sharing options...
peterb Posted September 18, 2015 Report Share Posted September 18, 2015 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. Quote Link to comment Share on other sites More sharing options...
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