hmm, some interesting comments wbagwell, what you say makes sense. Pieter, a dynojet kit basically consists of replacement fuel jets which improve the efficiency of your fuel combustion. I think it sprays the fuel in a mist which makes it burn better this combined with the air filter can give you 3 to 4 bhp gain (allegedly). When people fit a dynojet kit they also normally fit a k&n air filter as it seems to complement the dynojet. It is quite an expensive modification £75 for dynojet and £40 for air filter plus labour if you get someone to fit it for you. To really get the most out of it you need to adjust the jets to get optimum gain and to know whether you are getting optimum gain or not you need to be able to put the bike on rollers and take power readings through the rev range. The reason I asked if anyone else had done it is that I wouldn't want to pay out that sort of money unless I knew it was going to make a noticeable difference. Some people have said that sports bikes benfit more from these kits than a big trail bike , but then dynojet do make them for the Transalp as well.
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