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Canadian Daves JustKDX
is there a good drill bit set that realates to jet sizes??
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[QUOTE="Rich Rohrich, post: 1346835, member: 16241"] You're probably OK from the standpoint of a jet bolting in place but there is a bit more to it. Mikuni hex head jets are numbered by bulk flow, while Mikuni round head jets and Keihn jets are numbered by inner diameter in mm. The flow difference between a Mikuni 175 hex jet and a 180 is about 6cc ~3%) . Keihn jets are numbered by jet id, and the difference between a 178 and a 180 is about .0008" (I'll let those so inclined do the math to determine the flow difference) . Now to further confuse the issue keep in mind that air/fuel ratio is based on weight of fuel and weight of air, but jets essentially meter by volume. So we really need to know the weight of the fuel flowing through a jet to understand all this. In simplest terms fuel weight is a function of the area of the jet multiplied by the value of the square root of the fuel head pressure multiplied by the density of the fuel. It looks like this: weight of fuel = jet area * ( SQR Root (head pressure * fuel density) The sad fact is the cross sectional area of two [b]properly made[/b] jets marked with the same number can vary FAR MORE than the difference in flow due to small changes in density . Good jets can vary as much as 2-5% cheap jets can be closer to 10% variance, and jets drilled by hand with a junk drill bit set will be about as consistent as a potato with a pencil hole punched in it. I hope this helps. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
is there a good drill bit set that realates to jet sizes??
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