| 摘要 |
PURPOSE:To make a lead angle control with an optimal characteristic curve by arranging a means for converting opening of throttle valve and transmitting to a throttle sensor in a coupling system between the throttle valve and the throttle sensor. CONSTITUTION:CDI unit 21 is secured to the side section of an engine body 10. Throttle valve opening of a carburetor 11 is converted through cam face shape of cam boards 13B, 13C of a throttle cam 13 arranged in a coupling system between a throttle valve 16 and the input shaft 32 of a throttle sensor 31, lever ratio of a rolling lever, etc., and transmitted to the throttle sensor 31. Consequently, lead angle characteristic with respect to throttle valve opening is modified easily, and lead angle control can be made with optimal characteristic curve.
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