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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb' Issue - ATD's - Ignition timing
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<blockquote data-quote="Martyn Goodwin" data-source="post: 53075" data-attributes="member: 2433"><p>Too much retard is actually saying that at the fully advanced position, the ignition is too retarded - BUT your comments on the ATD are a cause to stop and fix that before you do anything else.</p><p></p><p>A while back I destroyed a piston in my Comet thru detonation - caused mainly by too much advance. And that excessive advance was caused by a faulty ATD. I did not realise it at the time, but the pivot pins in my ATD had worn/broken loose from the backing plate. I set my advance to be 36 BTDC with the ATD locked in what I thought was the full advance position but subsequently found that by applying a bit of brute force I could actually force the advance up to around 43 degrees - remove the brute force and it seemed like the advance was just 36. </p><p></p><p>I completely rebuilt my ATD, welded up the pivot pins, fitted new springs and also added some weld to the ATD ears so I could set its range to suit what I was after at the time , being 32 Degrees at full advance and 4 degrees at full retard. As I said earlier, I am about to try 34 degrees of advance with 6 degrees retarded. I can already tell you with 6 degrees retarded there are no starting issues.</p><p></p><p>SO FIX THE ATD FIRST.</p><p></p><p>Based on my personal experience with detonation, without the validation from a dyno run, I would NEVER set the advance on my Comet to any greater than 36 degrees - just my opinion.</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 53075, member: 2433"] Too much retard is actually saying that at the fully advanced position, the ignition is too retarded - BUT your comments on the ATD are a cause to stop and fix that before you do anything else. A while back I destroyed a piston in my Comet thru detonation - caused mainly by too much advance. And that excessive advance was caused by a faulty ATD. I did not realise it at the time, but the pivot pins in my ATD had worn/broken loose from the backing plate. I set my advance to be 36 BTDC with the ATD locked in what I thought was the full advance position but subsequently found that by applying a bit of brute force I could actually force the advance up to around 43 degrees - remove the brute force and it seemed like the advance was just 36. I completely rebuilt my ATD, welded up the pivot pins, fitted new springs and also added some weld to the ATD ears so I could set its range to suit what I was after at the time , being 32 Degrees at full advance and 4 degrees at full retard. As I said earlier, I am about to try 34 degrees of advance with 6 degrees retarded. I can already tell you with 6 degrees retarded there are no starting issues. SO FIX THE ATD FIRST. Based on my personal experience with detonation, without the validation from a dyno run, I would NEVER set the advance on my Comet to any greater than 36 degrees - just my opinion. Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Carb' Issue - ATD's - Ignition timing
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