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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition timing for twin plug heads
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<blockquote data-quote="vince998" data-source="post: 17290" data-attributes="member: 261"><p>Hi Mark,</p><p>Mine runs O.k, starts and idles well to, but i´ve been given three diffirent ignition advance figures from 3 different people?<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p><p>Obviously depending on how your using it (race or road)depends on your advance figures?</p><p></p><p>Dan, 200 jets to small? I was told that 180 where normal for MKI concentrics (i had 320 main jets in my monoblocks and the bike was quick, but that was a different carb). I´ve tried the plug chop, and the plug body is sooty black and the electrode brown.</p><p>i can empty a full fuel tank in 15 minutes into a jerry can allowing the fuel to run through the fuel lines (with the banjos still connected) so i don´t think i´ve got fuel starvation problems (carbs and jets are also internally clean)</p><p></p><p>H, i don´t have any other problems except the bike pulls like a train form 2800rpm (with the throttle fully open so running of the main jets) but then seems to tail off quite a bit at around 3900/4000rpm. Maybe this is normal for a Vincent (not having ridden another one for comparison i don´t know) but i thought i´d check for ignition settings first.</p><p>On open roads, i try not to run the engine below 2500rpm as it takes a while to get get it spinning again (especially in 3rd & 4th gear). Could this be ignition settings (to much advance) or just a characteristic of MKII cams?</p><p>Maybe just the characteristics of a 50+ year old bike ;-)</p><p></p><p>Cheers guys</p></blockquote><p></p>
[QUOTE="vince998, post: 17290, member: 261"] Hi Mark, Mine runs O.k, starts and idles well to, but i´ve been given three diffirent ignition advance figures from 3 different people?:confused: Obviously depending on how your using it (race or road)depends on your advance figures? Dan, 200 jets to small? I was told that 180 where normal for MKI concentrics (i had 320 main jets in my monoblocks and the bike was quick, but that was a different carb). I´ve tried the plug chop, and the plug body is sooty black and the electrode brown. i can empty a full fuel tank in 15 minutes into a jerry can allowing the fuel to run through the fuel lines (with the banjos still connected) so i don´t think i´ve got fuel starvation problems (carbs and jets are also internally clean) H, i don´t have any other problems except the bike pulls like a train form 2800rpm (with the throttle fully open so running of the main jets) but then seems to tail off quite a bit at around 3900/4000rpm. Maybe this is normal for a Vincent (not having ridden another one for comparison i don´t know) but i thought i´d check for ignition settings first. On open roads, i try not to run the engine below 2500rpm as it takes a while to get get it spinning again (especially in 3rd & 4th gear). Could this be ignition settings (to much advance) or just a characteristic of MKII cams? Maybe just the characteristics of a 50+ year old bike ;-) Cheers guys [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Ignition timing for twin plug heads
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