twinshock giles Posted November 14, 2009 Report Share Posted November 14, 2009 Am looking for a piston to fit my 311 Mont - originals are unobtainable according to Sandifords, does anybody know what other bikes have around a 73.5mm bore size? The barrel needs replating as well so I could get it bored to accept a slightly larger piston then replate or have it sleeved to take a smaller one. The marking on the piston is Gilardoni 2775 i've googled this but all the information seems to come back about Guzzi's Any help would be appreciated. Thanks Giles Quote Link to comment Share on other sites More sharing options...
stork955 Posted November 14, 2009 Report Share Posted November 14, 2009 Gday, you'll need to know compression height - distance from the pin to the crown, where the ring locating pins are in relation to the centreline of the piston and the dimensions of the pin. After that you need to know whether you can match the skirt design to fit the ports you have. Talk to your local Pro-X aftermarket dealer, they may be able to help you out. Cheers, Stork Quote Link to comment Share on other sites More sharing options...
twinshock giles Posted November 14, 2009 Author Report Share Posted November 14, 2009 Here are the dimesions measured with a cheapy pair of calipers - so definately not 100% accurate Pin 16mm Overall Height 70mm Top of pin to top of crown 25mm Ported in rear of piston & rear of skirt cut away Distance between ring stops measured directly across the top of the piston is 45mm appear to be centred on the centre of the piston Will buy a decent measuring set up next..... Cheers Quote Link to comment Share on other sites More sharing options...
bilc0 Posted November 14, 2009 Report Share Posted November 14, 2009 Have a chat with this company,they know there bit's. clicky here Quote Link to comment Share on other sites More sharing options...
ikb Posted November 15, 2009 Report Share Posted November 15, 2009 Try Kevin Breedon Racing Link If you Email him he will send you a drawing to add your sizes to then have a look for one! Quote Link to comment Share on other sites More sharing options...
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