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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Advance Timing Curve?
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<blockquote data-quote="Martyn Goodwin" data-source="post: 51627" data-attributes="member: 2433"><p>33 is an excellent setting to choose with modern fuels and compression of around 7.5:1, should result in a smooth running motor. BUT I recall you are running 9:1 pistons, so even 33 may be a tad high. Others with similar compression to your motor are running with full advance around 28 to 29 degrees.</p><p></p><p>When on the road, with the engine under load, such as when pulling hard up a hill if you detect any sign of pinging/detonation then reduce the advance by 2 degrees (down to 31) and road test again. Keep doing this (reducing the advance) till the pinging has abated. Detonation or pinging is a sure way to destroy the piston and also induce premature failure of the big end bearings. It also means, that with the detonation happening early, the motor is NOT producing its best power.</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 51627, member: 2433"] 33 is an excellent setting to choose with modern fuels and compression of around 7.5:1, should result in a smooth running motor. BUT I recall you are running 9:1 pistons, so even 33 may be a tad high. Others with similar compression to your motor are running with full advance around 28 to 29 degrees. When on the road, with the engine under load, such as when pulling hard up a hill if you detect any sign of pinging/detonation then reduce the advance by 2 degrees (down to 31) and road test again. Keep doing this (reducing the advance) till the pinging has abated. Detonation or pinging is a sure way to destroy the piston and also induce premature failure of the big end bearings. It also means, that with the detonation happening early, the motor is NOT producing its best power. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Advance Timing Curve?
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