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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New style BT-H mag
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<blockquote data-quote="BigEd" data-source="post: 34907" data-attributes="member: 161"><p>Dear Robert,</p><p>I run a "B" Rapide with a similar set-up regarding 7.3:1 compression and MK1 cams but with the fuel supplied through 28 mm Mikuni carbs. I have run one of the new type BT-H magnetos firing 4 coils since I built the bike from a basket case in September 2008 and currently have over 30,000 miles. I have been trouble free in the sparks department although I can't say I've had the opportunity of riding at the kind of altitudes you mention.</p><p>A few magnetos were supplied with coils that had a plain "spike" that the plug lead just pushed on to rather than a "spike" with a screw. (The screw type were unavailable for a while.) If the lead works loose from the plain "spike" the spark has to jump two gaps and this can overload the CDI circuitry inside the magnetos and lead to a misfire. It is worth checking the security of the lead in the coil. The coils with a screw "spike" are much more secure</p><p>It is easy to carry a spare coil as they are small and rrelatively inexpensive. N.B. The voltage supplied to the coils is much greater than 12 volts so be careful if you trying an alternative coil.</p><p>Another thing that can cause an intermittent misfire is a short on the black wire to the kill button and sometimes the kill button itself.</p></blockquote><p></p>
[QUOTE="BigEd, post: 34907, member: 161"] Dear Robert, I run a "B" Rapide with a similar set-up regarding 7.3:1 compression and MK1 cams but with the fuel supplied through 28 mm Mikuni carbs. I have run one of the new type BT-H magnetos firing 4 coils since I built the bike from a basket case in September 2008 and currently have over 30,000 miles. I have been trouble free in the sparks department although I can't say I've had the opportunity of riding at the kind of altitudes you mention. A few magnetos were supplied with coils that had a plain "spike" that the plug lead just pushed on to rather than a "spike" with a screw. (The screw type were unavailable for a while.) If the lead works loose from the plain "spike" the spark has to jump two gaps and this can overload the CDI circuitry inside the magnetos and lead to a misfire. It is worth checking the security of the lead in the coil. The coils with a screw "spike" are much more secure It is easy to carry a spare coil as they are small and rrelatively inexpensive. N.B. The voltage supplied to the coils is much greater than 12 volts so be careful if you trying an alternative coil. Another thing that can cause an intermittent misfire is a short on the black wire to the kill button and sometimes the kill button itself. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New style BT-H mag
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