ss74 Posted December 5, 2006 Report Share Posted December 5, 2006 Does anyone know the performance difference and mapping availability between these kits?Is anyone using any of the above ? Quote Link to comment Share on other sites More sharing options...
dixie Posted December 5, 2006 Report Share Posted December 5, 2006 what is the lewis 290 ? is that aussi spec or do we get them in the uk? if so how much? Quote Link to comment Share on other sites More sharing options...
scott_king Posted December 5, 2006 Report Share Posted December 5, 2006 what is the lewis 290 ?is that aussi spec or do we get them in the uk? if so how much? Hi all I have got a feeling its only in the USA. It Quote Link to comment Share on other sites More sharing options...
ludde Posted December 5, 2006 Report Share Posted December 5, 2006 the 290 kit sounds very interesting, but i've never heard about thumper racing. are their products any good? its a shame that the hrc 260 kit is so expensive, but you just know that it will be brilliant. is the mitani 280 kit still around? i thought they stop selling that one. Quote Link to comment Share on other sites More sharing options...
munch Posted December 5, 2006 Report Share Posted December 5, 2006 yes ,the mitani 280 is still around and it is in my opinion the best barrel and piston kit available. it works best with a custom map Quote Link to comment Share on other sites More sharing options...
snowblind Posted December 6, 2006 Report Share Posted December 6, 2006 Thumper Racing is one of the premier four stroke hop up shops in the states, they make excellent products, and for most brands. Quote Link to comment Share on other sites More sharing options...
ss74 Posted December 6, 2006 Author Report Share Posted December 6, 2006 Thanks for the replies. Yes the Lewis kit is the Thumper Racing kit , it does seem like great value, but I dont see how it doesnt need re mapping ? Cheers Quote Link to comment Share on other sites More sharing options...
munch Posted December 6, 2006 Report Share Posted December 6, 2006 QUOTE the way I figure it though is the EFI measures what the engine needs and gives it to it, kind of like diffrent elevations reply . no it does not Quote Link to comment Share on other sites More sharing options...
masso Posted January 2, 2007 Report Share Posted January 2, 2007 QUOTE the way I figure it though is the EFI measures what the engine needs and gives it to it, kind of like diffrent elevations reply . no it does not now, what I don't understand, is why create a new barrel and piston for just 10cc increase??? does it make much difference ....anyone know ????.........................................................masso Quote Link to comment Share on other sites More sharing options...
masso Posted January 3, 2007 Report Share Posted January 3, 2007 Masso Posted Today, 10:47 AM QUOTE(munch @ Dec 6 2006, 10:55 AM) QUOTE the way I figure it though is the EFI measures what the engine needs and gives it to it, kind of like diffrent elevations reply . no it does not now, what I don't understand, is why create a new barrel and piston for just 10cc increase??? does it make much difference ....anyone know ????.........................................................masso That was the 290cc kit we where talking about...+40cc The HRC kit is only 260cc but has a cam and the two stage mappable EFI, why only 10cc I don't know, maybe that is what works the best for there cam. apparently the cam alone is what we want!!!....its very torquey Quote Link to comment Share on other sites More sharing options...
malibudon Posted January 3, 2007 Report Share Posted January 3, 2007 Thumper Racing is one of the premier four stroke hop up shops in the states, they make excellent products, and for most brands. :agree: I had Thumper Racing build an XR280R motor for me, and it was awesome! Quote Link to comment Share on other sites More sharing options...
sirhc Posted May 11, 2007 Report Share Posted May 11, 2007 Info update, The Thumper racing kit after testing has down graded to a 272cc because the head would not flow for a 290cc. It is being built for U.S. Montesa. Since my bike already has about every available option I figured why not get a big bore for it. I got the Mitani 260cc kit that is now available from LewisportUsa which includes a two stage programmable ECU as well as a cam, barrel and piston. It is built to the same specs as the HRC kit. The piston is a two ring design (stock is three ring) and has a different done shape. The first thing I noticed was the bike defiantly had more snap. After riding a two day trial on it and then a little more at home it will also grunt down at lower RPM's so you can use a higher gear in tighter situations and then still have the snap when you need it. I also let a lower class rider try it on the softer setting and he really liked how it worked in the slow rpm situations. With this kit that has the two stage mapping it works well from novice to expert Quote Link to comment Share on other sites More sharing options...
marky boy Posted May 11, 2007 Report Share Posted May 11, 2007 Cant really as yet add too much constructive info but ive just got a repsol rep with the 280 kit on it and boy does it go!!. Maybe i should start and do supermoto! Not really had chance to ride the thing as yet, but just going to gear it down and try different maps on it. Im on the single stage unit and think i could do with the 2 stage one and have looney and then 80cc setting Will let you know how it shapes up. Quote Link to comment Share on other sites More sharing options...
benz19 Posted February 11, 2008 Report Share Posted February 11, 2008 Just to bring this topic back to life...................................... The S3 280 cc kit is now available in the UK,anyone got any plans to get one? Or has anyone tried the Thumper racing 272 kit?? Benz Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted February 11, 2008 Report Share Posted February 11, 2008 S3 kit is 800 euros maybe Quote Link to comment Share on other sites More sharing options...
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