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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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<blockquote data-quote="Martyn Goodwin" data-source="post: 43355" data-attributes="member: 2433"><p>The information in the graph is very interesting but I suspect it only tells half of the story. It is very clear what happens as the engine/atd revs increase BUT how does the ATD perform from the fully advanced position as the engine/atd revs fall? My recent experience was an erratic idle, generally at least twice the desired RPM when coming to a standstill - and at times the revs would remain high, but only sometimes would they drop to something I considered normal. The cause was traced to "stiction" within the ATD keeping it in a partially advanced state even when the throttle was closed. There was found to be just a few thou of interference between the ATD rear flange and the magneto body - so around 0.015" was removed from the rear flange of the ATD. At the same time the cam ring inside the magneto was re-greased. Both these things have helped reduce but not eliminate the problem. So I have ordered a set of stronger ATD springs from the spares co to see it that will get the ATD back under control as the revs FALL. More to follow once the stronger springs arrive and are installed. Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 43355, member: 2433"] The information in the graph is very interesting but I suspect it only tells half of the story. It is very clear what happens as the engine/atd revs increase BUT how does the ATD perform from the fully advanced position as the engine/atd revs fall? My recent experience was an erratic idle, generally at least twice the desired RPM when coming to a standstill - and at times the revs would remain high, but only sometimes would they drop to something I considered normal. The cause was traced to "stiction" within the ATD keeping it in a partially advanced state even when the throttle was closed. There was found to be just a few thou of interference between the ATD rear flange and the magneto body - so around 0.015" was removed from the rear flange of the ATD. At the same time the cam ring inside the magneto was re-greased. Both these things have helped reduce but not eliminate the problem. So I have ordered a set of stronger ATD springs from the spares co to see it that will get the ATD back under control as the revs FALL. More to follow once the stronger springs arrive and are installed. Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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