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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special Carburation
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<blockquote data-quote="oexing" data-source="post: 102207" data-attributes="member: 1493"><p>Ben,</p><p>I see your problem mainly carburation-related. You certainly will set ignition timing either suitable for twin sparks at below 30 degrees full advanced or around 34 degrees with one spark plug as on standard bikes. BUT apart from that I guess your Dellorto components will need a lot of tuning seeing that black spark plug - an indication for overly rich mixtures in various ranges of operation. Below is a link to a Dellorto manual plus link to a dealer showing what sort of fine tuning components are available for said ranges of operation depending on slide positions. Shipping to UK is € 10.50 in case . . . .</p><p> Basically I´d suggest using an O2 sensor for time saving and sparing you a lot of guesswork. For orientation in short: Idle is set by idle jet. -- 1/8 slide open look at slide cut out plus needle jet size -- 1/4 to 3/4 slide up is needle jet SIZE and needle SHAPE -- 3/4 to full is main jet and needle shape.</p><p> So depending on your findings get that sort of components for your particular problem zones. I´d first try a slide with more cut-out and a smaller needle jet. There are 20 different needles plus various needle jets so you will have to find out at what amount of slide aperture you like weaker or richer. The famous SU carbs are fine tuned with loads of needle shapes only, no slide variations there, no idle jets as well. So you get the idea . Flat out is about right you say, so ignition is not your biggest problem. Sorry I cannot tell any sizes of Dellorto components, hope a dealer may be helpful.</p><p></p><p> Vic</p><p><a href="http://www.iwt.com.au/private/Dellorto%20manual.pdf" target="_blank">Dellorto manual</a></p><p></p><p><a href="https://www.stein-dinse.biz/index.php?cPath=15_2699" target="_blank">Dellorto components dealer</a></p></blockquote><p></p>
[QUOTE="oexing, post: 102207, member: 1493"] Ben, I see your problem mainly carburation-related. You certainly will set ignition timing either suitable for twin sparks at below 30 degrees full advanced or around 34 degrees with one spark plug as on standard bikes. BUT apart from that I guess your Dellorto components will need a lot of tuning seeing that black spark plug - an indication for overly rich mixtures in various ranges of operation. Below is a link to a Dellorto manual plus link to a dealer showing what sort of fine tuning components are available for said ranges of operation depending on slide positions. Shipping to UK is € 10.50 in case . . . . Basically I´d suggest using an O2 sensor for time saving and sparing you a lot of guesswork. For orientation in short: Idle is set by idle jet. -- 1/8 slide open look at slide cut out plus needle jet size -- 1/4 to 3/4 slide up is needle jet SIZE and needle SHAPE -- 3/4 to full is main jet and needle shape. So depending on your findings get that sort of components for your particular problem zones. I´d first try a slide with more cut-out and a smaller needle jet. There are 20 different needles plus various needle jets so you will have to find out at what amount of slide aperture you like weaker or richer. The famous SU carbs are fine tuned with loads of needle shapes only, no slide variations there, no idle jets as well. So you get the idea . Flat out is about right you say, so ignition is not your biggest problem. Sorry I cannot tell any sizes of Dellorto components, hope a dealer may be helpful. Vic [URL='http://www.iwt.com.au/private/Dellorto%20manual.pdf']Dellorto manual[/URL] [URL='https://www.stein-dinse.biz/index.php?cPath=15_2699']Dellorto components dealer[/URL] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Egli 500 Special Carburation
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