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In extreme cases (no names here), the ignitions on some new bikes are barely adequate for normal operating conditions. Push a few variables the wrong way – higher than normal altitude, poor quality gas, constant low-speed running – and you have a motorcycle that refuses to motor. If you indulge in any form of motoring where the engine is under load for extended periods, or racing, an ignition breakdown is not unusual. A fresh set of plugs will usually get the engine running straight for a while, but is often a treatment of symptoms, and not a cure. The Problems : Under ideal conditions, even a weak spark at the plug is sufficient for ignition and combustion to occur. Ideal conditions are new spark plug (properly gapped), correct air/fuel, ratio, proper engine compression and temperature, and spot-on timing. Ideal conditions can’t last very long. The Solution : If the engine is put into a reasonably good state of tune, providing an extremely hot spark will most likely keep it that way. Spark intensity can be increased in several ways. Deposits won’t form as easily, the engine will run better and cleaner, and will require less maintenance. As a rule, automotive engines have more cylinders and higher demands on their ignitions, so car coils are more powerful and are frequently used to upgrade motorcycle ignitions. With the engine stopped and ignition on, a stock coil drew 2.5 amperes of current. At idle, average current flow was 1.4 amps, and at 4500 rpm, flow was 1.2 amps. Rowing the engine higher reduced current flow only slightly more, hence 4500 was used as the upper rpm limit. The intended mounting location was on the front downtubes beneath the steering head. Under full suspension compression, however, the fender would have contacted the coils. After much deliberation, the coils were mounted to the downtubes, outboard of the exhaust outlets. They’re down in the airflow. but hamper engine cooling little, if at all.
Tags : air fuel ratio, new bikes, stock coil, quality gas, automotive engines, new spark, motorcycle ignitions, full suspension, amperes, extreme cases, spark plug, coils, low speed, deliberation, airflow
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