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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH magneto
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<blockquote data-quote="BigEd" data-source="post: 93905" data-attributes="member: 161"><p>Dear Sakura,</p><p>Echoing what Alberevin says. My Rapide settings are as above. It always started easily on the kickstart and the same now I've fitted an electric start. It has only ever had the new BT-H magneto fitted since I built the bike. It has never "kicked back" in 40,000 + miles.</p><p>If the bike runs fine when you have it going but you suspect that the ignition timing is making your bike hard to start then it is very easy to adjust the timing a little by slacking three three fixings on the magneto and turning the magneto body a little. The slots in the magneto flange allow for several degrees of adjustment either way if you originally fitted the magnet with the fixings central in the slots. A small mark on flange and crankcase beforehand will lt you set it back to where you started. Try it a little at a time and see if you notice any difference. It is not usually critical to 1º or 2º.</p><p>If you suspect a weak spark first check that your plug gaps are set to no more than the 0.018" listed in the handbook. Also check that the plug leads are firmly fixed onto the screw on the coils and that the screw goes down the middle of the lead and not to one side of the centre wire. Check the same at the plug cap end too. Non resistor plugs should be fitted and preferably unsuppressed plug caps. You can remove the spark plugs and with a plug cap removed hole the end of the lead away from the engine while someone spins it over. You should see a <u>thin</u> spark that will jump over 1/4" or so. Don't expect to see a bright blue spark, that is not what is produced by this system.</p><p>You said: <em>"But what do I know about electronic ignition"</em> Sometimes we have to accept that something just works even though we don't understand why. Many drivers only know that you turn a key, press some pedals and miraculously their vehicle moves.<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="BigEd, post: 93905, member: 161"] Dear Sakura, Echoing what Alberevin says. My Rapide settings are as above. It always started easily on the kickstart and the same now I've fitted an electric start. It has only ever had the new BT-H magneto fitted since I built the bike. It has never "kicked back" in 40,000 + miles. If the bike runs fine when you have it going but you suspect that the ignition timing is making your bike hard to start then it is very easy to adjust the timing a little by slacking three three fixings on the magneto and turning the magneto body a little. The slots in the magneto flange allow for several degrees of adjustment either way if you originally fitted the magnet with the fixings central in the slots. A small mark on flange and crankcase beforehand will lt you set it back to where you started. Try it a little at a time and see if you notice any difference. It is not usually critical to 1º or 2º. If you suspect a weak spark first check that your plug gaps are set to no more than the 0.018" listed in the handbook. Also check that the plug leads are firmly fixed onto the screw on the coils and that the screw goes down the middle of the lead and not to one side of the centre wire. Check the same at the plug cap end too. Non resistor plugs should be fitted and preferably unsuppressed plug caps. You can remove the spark plugs and with a plug cap removed hole the end of the lead away from the engine while someone spins it over. You should see a [U]thin[/U] spark that will jump over 1/4" or so. Don't expect to see a bright blue spark, that is not what is produced by this system. You said: [I]"But what do I know about electronic ignition"[/I] Sometimes we have to accept that something just works even though we don't understand why. Many drivers only know that you turn a key, press some pedals and miraculously their vehicle moves.:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
BTH magneto
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