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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Amal Premier 900 series Carb for Comets
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<blockquote data-quote="Martyn Goodwin" data-source="post: 48639" data-attributes="member: 2433"><p>Just back from a 180 mile run. I can report that the change I made yesterday - moving the ignition from 28 to 31 BTDC fully advanced has indeed reduced the tendency of the exhaust to "Blue" (I polished all the blue out of the pipe before todays ride) I can also report that the bike felt like it had increased torque - more pulling power on hills - than on prior rides. Twice I pulled the spark plug, once after around 5 miles at a steady 70 mph with around 20% throttle and once after a long uphill of around 2 miles at 60 mph and a wide open throttle. In both instances the spark plug looked just fine - the electrodes were clean, the centre ceramic dark brown but free from black carbon and the outer metal body had a dusting of black carbon.</p><p></p><p>I figure for now I an going to call the tuning effort done. All that remains is to fix the timing when the ignition is fully retarded. As noted in my last post I now have fully retarded at 1 BTDC and fully advanced at 31 BTDC. I will add metal (by welding) to the ears of the ATD to yeild a 25 to 26 degree range. That will allow me to then set the ignition to be fully retarded at 4 to 5 BTDC and fully advanced at 30 to 31 BTDC. BUT I do not see this as urgent work.</p><p></p><p>Regards,</p><p></p><p>Martyn</p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 48639, member: 2433"] Just back from a 180 mile run. I can report that the change I made yesterday - moving the ignition from 28 to 31 BTDC fully advanced has indeed reduced the tendency of the exhaust to "Blue" (I polished all the blue out of the pipe before todays ride) I can also report that the bike felt like it had increased torque - more pulling power on hills - than on prior rides. Twice I pulled the spark plug, once after around 5 miles at a steady 70 mph with around 20% throttle and once after a long uphill of around 2 miles at 60 mph and a wide open throttle. In both instances the spark plug looked just fine - the electrodes were clean, the centre ceramic dark brown but free from black carbon and the outer metal body had a dusting of black carbon. I figure for now I an going to call the tuning effort done. All that remains is to fix the timing when the ignition is fully retarded. As noted in my last post I now have fully retarded at 1 BTDC and fully advanced at 31 BTDC. I will add metal (by welding) to the ears of the ATD to yeild a 25 to 26 degree range. That will allow me to then set the ignition to be fully retarded at 4 to 5 BTDC and fully advanced at 30 to 31 BTDC. BUT I do not see this as urgent work. Regards, Martyn [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
New Amal Premier 900 series Carb for Comets
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