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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT; $400 question ATV irniter
I tried alt.electronics.repair and didn't gat any good ideas. I don't
expect you geniuses to solve my problem but maybe someone can point me in the right direction. The 3-wheeler only cost $400 when I bought it used many years ago! Between the flywheel pickup coil (magneto) and the high voltage coil for the spark plug there is a black box that controls the spark and its advance. This box on My Kawasaki 3-wheeler is called the Igniter and this simple tiny circuit board costs $400! It was designed before 1982 and contains one IC and a bunch of discrete components. There has got to be a better (cheaper) way to do this. The spark starts at 10 deg before Top Dead Center and advances to 40 deg before TDC by 2000 rpm. Since electronics cannot advance time apparently the pickup is at 40 deg BTDC and the pulse is delayed to 10 deg BTDC at low speeds. If the timing delay fails the spark reverts to 40 deg BTDC for all speeds, meaning the engine cannot run at low speeds therefore cannot be started. Bad idea. How could this black box be designed using components availiable today to control the spark advance, preferably adjustable or programable so it would work in a wide variety of ATVs etc? If possible It would be preferable to have the failure mode at low speed advance. Certainly I would hope for a price below $400. All suggestions welcome -- Free men own guns, slaves don't www.geocities.com/CapitolHill/5357/ |
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