north_yorkshire_lad Posted November 10, 2005 Report Share Posted November 10, 2005 about to buy an 06 125 and was just weather anyone had tips as we were thinking of 1. kehin carb 2. high compression head 3. 9t-48t sprokets thanks Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted November 10, 2005 Report Share Posted November 10, 2005 Try it without the high comp head first. Quote Link to comment Share on other sites More sharing options...
matt Posted November 10, 2005 Report Share Posted November 10, 2005 high comp head is waist of time i think. grind the ports that makes em much quicker. Quote Link to comment Share on other sites More sharing options...
arnoux Posted November 11, 2005 Report Share Posted November 11, 2005 Buy a copy of A.Graham Bells "performance Two Stroke Tuning" - AND READ IT! before you attempt to GRIND THE PORTS, it's very easy to go backwards with porting not forwards if you don't understand the theory first! Quote Link to comment Share on other sites More sharing options...
mattylad Posted November 11, 2005 Report Share Posted November 11, 2005 I agree. It is better to change the shape of the piston crown before you attack the cylinder. Remove the height required in the area of the ports. Start with removing 0.5 then 1.0 mm and see the difference. If you go too far you choose the best value and apply to the cylinder with a fresh piston. Quote Link to comment Share on other sites More sharing options...
gasgas Posted November 11, 2005 Report Share Posted November 11, 2005 Matt can you elaborate on: grinding the ports. It is easy said, but what part do you suggest to grind? I feel you have done this mod with satisfaction. Quote Link to comment Share on other sites More sharing options...
nitjay - hrc Posted November 11, 2005 Report Share Posted November 11, 2005 How much does the Kehin Carb cost? What sort of an increase does it give. I wouldnt want it on my current bike theres no point but on a future one..... Do they only do them for Gas Gas? Quote Link to comment Share on other sites More sharing options...
north_yorkshire_lad Posted November 13, 2005 Author Report Share Posted November 13, 2005 no ive heard that you can fit them to shercos but i think beta have a carb that is an aftermarket mod but i imagine it would solve the jet, float issue and crispen that power delivery as well as helping it to rev out cleanly were as the kehin softens the bottem end slightly while increasing the mid to top end power range (bit sad i know but i read up on it ) Quote Link to comment Share on other sites More sharing options...
lloydpricegasgas125 Posted November 13, 2005 Report Share Posted November 13, 2005 any one know what jets you need for a kehin carb on a gasgas 125. cheers Quote Link to comment Share on other sites More sharing options...
north_yorkshire_lad Posted November 13, 2005 Author Report Share Posted November 13, 2005 jets in a 125 Keihin, main 118, pilot 42, needle JJH with clip on middle, 3.5 slide, Quote Link to comment Share on other sites More sharing options...
jools Posted November 14, 2005 Report Share Posted November 14, 2005 Suggest speaking to Kev at Gasgasuk. he is extremly helpful and will point you in the right direction! Popular mods usually are; Keihin carb 9/48 gearing high comp head porting and polishing gas flowing etc I know someone who did this on their 125 gasser and it was still gutless Really you should just consider gearing and carburation (with the standard carb) to start with. Quote Link to comment Share on other sites More sharing options...
jools Posted November 14, 2005 Report Share Posted November 14, 2005 the kehin softens the bottem end slightly <{POST_SNAPBACK}> I'm sorry, but thats Bo***x! Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted November 14, 2005 Report Share Posted November 14, 2005 Made adifference to my bottom end (290 04) and I think the Gas Gas uk riders (125) like them because of the improvement throughout the rev range. Quote Link to comment Share on other sites More sharing options...
north_yorkshire_lad Posted November 15, 2005 Author Report Share Posted November 15, 2005 jools i dont see y i'd lie. and it does as i can tell you from feel and from what john shirt states on his website and i did mention that it increases the mid to top end power range. Quote Link to comment Share on other sites More sharing options...
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