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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
YeeHAw!! A sparkplug post!!!
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[QUOTE="Jim Crenca, post: 414606, member: 22335"] CC, I remember that post about sparkplug heat range selection and agree that it got so convoluted as everyone wanted to contribute, but none had a clue for determining the answer; instead all the experts talked up a storm on how to read a plug. As you may recall, I had a similar post in Advance Tech. that took a different approach. My thought (which was later proved too costly) was to forget about reading color, but determine jetting (and plug selection) by using air/fuel ratio as the guide (with 14.5:1 being the accepted standard). I know that my friends and I had great tuning performance gains using exhaust temp measurements in drag cars & cylinder head temp measurements in 4 stroke go karts (also OK results using exhaust gas temp in 2 stroke go karts). This coupled with altitude, temperature, & barometric pressure allowed us to dial in an engine quickly, effeciently, & safely regardless of the track or the weather (relative to the competition). The summation of Rich Rohrich's thoughts on this were as follows: * Dirt bikes don't usually run full time, WOT (unless they are flat track bikes or desert racers) * EGT or CHT gauges (or the so called air ratio meters) for cars don't react quickly, or accurately enough * O2 sensors won't last or read accurately in a 2 stroke (unless they are very expensive * And, the only way to accurately tune a 2 stroke with electronics is with a spark detonation counter developed by Honda and presented in a SAE paper; it used a microprocessor & propietary software) I think that fuel injection may change all this in the future, and, I don't know a scientific way to select plug heat range either! I do know that Kawasaki specs a B9 plug for my 94 KDX and that the B8 works much better and has proven to be a good choice even when jetting is on the lean side. Jim PS. I had forgotten that Gordon Jennings wrote great articles although his "plug selection" advice was more like what NOT to use IMO. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
YeeHAw!! A sparkplug post!!!
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