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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Electronic Tacho
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<blockquote data-quote="Howard" data-source="post: 51552" data-attributes="member: 271"><p>Assuming this attracts people who understand electronics, maybe someone can explain something for me - anything more than 2 wires on a gadget confuses me.</p><p>Ever since my tacho gearbox spit its innards out, I've had the wrong ratio gearbox (bought from ebay). It came to a head at Cadwell last year when the noise meter was reading high due to me using the wrong revs for the test.</p><p>While in the garage one winter day I noticed a broken instrument cluster off my daughter's 125 Yamaha (single cylinder 4 stroke), having nothing better to do, I connected it to the Egli (Pazon ignition firing twice per rev) and it worked. Reasoning that the tacho would read double due to the Yam firing once per rev, I set about modifying it to fit. Double the reading was easier to convert mentally than 1.3 x of my existing mechanical one, and it would be registering about 3 at 30 mph, 7 at 70 mph etc, which is handy when my bicycle speedo has no light for night time riding - Keep up, I know it's confusing. After several hours stripping bits out of a Smiths clock and fitting the Yam innards I had a presentable looking, working tacho - quite satisfying for one of my quick projects to actually work.</p><p></p><p>The thing is, it reads the right revs, not double and I can't work out why. The pickup wire goes to a single double output coil.</p><p></p><p>Any offers?</p><p></p><p>H</p></blockquote><p></p>
[QUOTE="Howard, post: 51552, member: 271"] Assuming this attracts people who understand electronics, maybe someone can explain something for me - anything more than 2 wires on a gadget confuses me. Ever since my tacho gearbox spit its innards out, I've had the wrong ratio gearbox (bought from ebay). It came to a head at Cadwell last year when the noise meter was reading high due to me using the wrong revs for the test. While in the garage one winter day I noticed a broken instrument cluster off my daughter's 125 Yamaha (single cylinder 4 stroke), having nothing better to do, I connected it to the Egli (Pazon ignition firing twice per rev) and it worked. Reasoning that the tacho would read double due to the Yam firing once per rev, I set about modifying it to fit. Double the reading was easier to convert mentally than 1.3 x of my existing mechanical one, and it would be registering about 3 at 30 mph, 7 at 70 mph etc, which is handy when my bicycle speedo has no light for night time riding - Keep up, I know it's confusing. After several hours stripping bits out of a Smiths clock and fitting the Yam innards I had a presentable looking, working tacho - quite satisfying for one of my quick projects to actually work. The thing is, it reads the right revs, not double and I can't work out why. The pickup wire goes to a single double output coil. Any offers? H [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Electronic Tacho
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