castreuilo Posted December 26, 2024 Report Share Posted December 26, 2024 Hello everyone, I bought a 2020 Gasgas GP 300cc, with the red cylinder head, but I don't have the right compression, there was 1.2mm of base gasket, does anyone know what thickness is the original base gasket? Thank you very much in advance. Olivier from Belgium. 1 Quote Link to comment Share on other sites More sharing options...
RonH Posted January 5 Report Share Posted January 5 (edited) I know that the 2023 model 300 is .3mm. I would assume it’d be the same then in 2020. Hope this helps. Edited January 5 by RonH 1 Quote Link to comment Share on other sites More sharing options...
castreuilo Posted January 6 Author Report Share Posted January 6 Hi Ron, thank's for your answer, but I see that this documentation is for the new model 2023 with a new head. I try 0.65mm and this was all too much pressure, the motor dont turn right. But thank's at all, it will be good to know for my next motorbike. Quote Link to comment Share on other sites More sharing options...
faussy Posted January 6 Report Share Posted January 6 (edited) From memory they were 1 mm, but I'm not 100% sure. Can you measure your squish with your 0.65mm gasket fitted? Edited January 6 by faussy Quote Link to comment Share on other sites More sharing options...
konrad Posted January 6 Report Share Posted January 6 Ultimately, you want to use the base gasket (or gaskets) that gives a squish clearance compatible with your riding preferences, altitude, and local fuel. This is done via experimentation. As faussy mentioned, you should get a baseline by measuring your squish clearance. This link illustrates the procedure: https://www.vhm.nl/en/page/technical-support/squish-measurement The "tin wire" is typically solder. Quote Link to comment Share on other sites More sharing options...
castreuilo Posted January 8 Author Report Share Posted January 8 Hi Faussy, thank's for your answer, I always heard that a 1mm gasket was to have a smoother bike, but I'm looking for the origin. I tried with the 0.65 joint, but it really doesn't work, I put the 0.8mm back. But what is the right squish? Quote Link to comment Share on other sites More sharing options...
castreuilo Posted January 8 Author Report Share Posted January 8 Hi Konrad, thank's for your answer, I visit the link, and yes indeed, I did it before, I will done again and I come back. Have a nice day. Quote Link to comment Share on other sites More sharing options...
konrad Posted January 8 Report Share Posted January 8 Notes I have on my old GG TXT321 say the minimum squish clearance is 1.25 mm. Different thickness base gaskets are available partly to accommodate manufacturing tolerances, and partly for rider preference in power delivery (more squish clearance = softer). When you measure the squish clearance, make sure the head and piston are free of carbon. Quote Link to comment Share on other sites More sharing options...
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