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Canadian Daves JustKDX
Jetting results
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[QUOTE="canyncarvr, post: 668454, member: 16552"] Dan said: 'It sounds like a little tweaking with the crossover points of the different jetting circuit's might be needed.' Something to consider (read, 'incredibly important!') regarding needle choice and crossover points. The L1 designationof a needle is [b]not[/b] the length of the straight section!! It is the length to the point at which the diameter of the needle is 2.515mm. That is generally called the 'magic' number. It's 'magic' cuz who knows why that diameter was chosen anyway. I digress......... This magic number business gets critical when changing tapers. Consider the following: With a 'slower' taper of 1'15" (1.25º/'B' taper), the taper has to [b] start earlier[/b] (higher) on the needle to get to the magic number compared to a 'faster' tapered 1'34" (1.5º/'C' taper). Everything else staying the same, that will make the actual straight section (the part with no taper whatsoever) of the 'B' series needle [b]shorter[/b] than that of a 'C' needle. Compare a DEK-3 to a CEK-3 on JD's spreadsheet and you'll see that taper [b]start[/b] showing up with the CEK being considerably richer at 1/8 throttle. Which is something for you to consider....a 'D' series needle, but not one with such a large diameter as the 'DCQ' (2.745mm straight). A smaller diameter combined with a later starting slope (longer L1) will give you a clean (no plug loading) bottom and a smoother transition point...maybe a DEK. Information on JD's spreadsheet can be found [url=http://info.product-finder.net/tt/The--Original--James-Dean-JD-Jetting-Guide.html] [b]here.[/b] [/url] ****EDIT*** Well, sorta. Looks like he changed horses again. He's back at thumpertalk, it seems. Info can be had above, but the 'buy it' link is dead. I've asked him for verification, but it looks like [url=http://shop.thumpertalk.com/SearchResults.asp?Cat=278] [b]THIS[/b] [/url] will work. I'll update this (again) if I find out different. Cheers! ****edit**** Your spent time will be well worth it. Congrats on the effort! ;) [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Jetting results
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