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techtalk:evo:carb02c [2019/10/29 12:21]
ixl2relax [Why Not Dynojet Kits?]
techtalk:evo:carb02c [2019/10/29 19:57] (current)
ixl2relax [Why Not Dynojet Kits?]
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 +Comments from ASWRacing in Post#16 on this XLForum Thread: [[http://​xlforum.net/​forums/​showthread.php?​t=2074979|Is it worth fitting dynojet kit?]]
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 +Bottom line is that a kit is totally unnecessary to make a good running CV. You can do it with less than ten bucks worth of jets from your dealer, or an outfit like CV Performance. In some cases you'll get it to run a little better with a couple bucks more for a new needle, too, depends on the needle you already have. Do that, and the carb will work as well as it's ever going to work.
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 +Drilling the slide, putting in a weaker spring, changing the emulsion tube, none of that stuff does squat for power or throttle response either one, in my experience. In fact it may do more harm than good. What these carb kits really do best is separate you from your money. There'​s tons of junk on the market for these bikes that do the same. Skepticism is warranted with this kind of stuff, there'​s lots of opportunity to waste money.
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 +I once had a customer send me a tricked-out CV40 for testing. The company that prepped it had done all kinds of polishing and slide mods and a trick emulsion tube and all that crap. I dyno tested it against a stock CV40 that had only been jetted properly for the combination,​ no other mods. The stock carb actually beat the tricked out carb on the dyno, by a small but repeatable margin.
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 As already mentioned in the main CV40 carb tuning page, the Dynojet Kits (and many equivalent ones) can be an issue. Typically, they replace the factory needle, emulsion tube, main jet & diaphragm/​slide spring. They also recommend that you drill the slide vacuum hole out for quicker throttle response. The Dynojet emulsion tube and main jets are not compatible with the Keihin emulsion tube/jets - they use different threads, which means you can only buy jets from them. As already mentioned in the main CV40 carb tuning page, the Dynojet Kits (and many equivalent ones) can be an issue. Typically, they replace the factory needle, emulsion tube, main jet & diaphragm/​slide spring. They also recommend that you drill the slide vacuum hole out for quicker throttle response. The Dynojet emulsion tube and main jets are not compatible with the Keihin emulsion tube/jets - they use different threads, which means you can only buy jets from them.