zippy Posted September 20, 2009 Share Posted September 20, 2009 Panerai, Fabulous Pics, I think it is great you are able to do all that engine work yourself. Hope the bike is performing as you had hoped. Baldilocks Posted Today, 06:33 PM is this GasGasBens Uncle ? Quote Link to comment Share on other sites More sharing options...
ludde Posted September 20, 2009 Share Posted September 20, 2009 Ok ok, at first : i draw and make (with a friend) all the bolt ! not buy in a dealer. my engine power up kit have 270cc (bore is 80.00) piston "J.E" for CRF + cam shaft HRC + body throtle "two" mape + Termignoni exhaust titane. The resultat is : bof !!!! the "RPM" elevation is "slow", the torque is better, the power is better to, but news vibrations (not big, but........) because the piston is more heavy, it is not for a 4RT..... well, this is my sensation.Franck. How much did you mill off your 270cc piston? Is it to the same height as the standard piston? Quote Link to comment Share on other sites More sharing options...
panerai Posted September 20, 2009 Author Share Posted September 20, 2009 Hi, i cut the "wings" of the piston and the height is ~~ same... but it's not enough ! the top of the piston is cut to (for correct the compression ratio) all the kit for 4RT use a CRF'piston kit, never "special" for 4RT (except the HRC'260 kit, but the difference is just 1.5 mm bore) it's easy to see, the top of the piston have the valves' print and the valves of the CRF is bigger than 4RT. Franck. Ps: have you see "Forumty" ?? and what do you thinks ?? Quote Link to comment Share on other sites More sharing options...
panerai Posted September 20, 2009 Author Share Posted September 20, 2009 You have in "Trials Central" a very great guys !! he a make himself lot of beautiful things (for 4RT and many other bikes) his name is "fantic303". In England it's fantic303 in French it's cotafan ! hello Bas !! Franck. Quote Link to comment Share on other sites More sharing options...
fantic303 Posted September 21, 2009 Share Posted September 21, 2009 thank you Franck, but you have also made a lot of nice things ! modification of the chain tensioner, your fuelpump bracket, pressure regulator etc, etc.... Quote Link to comment Share on other sites More sharing options...
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