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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Throttle Slide Needle
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<blockquote data-quote="greg brillus" data-source="post: 160554" data-attributes="member: 597"><p>Well it all depends on what slides you have........usually a number 4 is standard........a number 3 will generally be too rich.........there are 3 1/2 available as well.......and these can work ok, although i have found these to be rich as well.........If the carb parts are in good condition, then the first thing to look at is the float levels, as these will make the engine run rich........a quick check is to simply stand a couple of meters behind your bike with the bike upright, and check the visual alignment of the carb/bowl in relation to the vertical case/engine lines. If the bowl is high or low, you will see it quite easily........then simply rotate the carb complete via the clamp/bolt on the manifold stub and this willl put things in the ball park.........actually checking the float levels acurately involves making a simple tool from an old carb bowl attachment banjo bolt with a brass nipple drilled/taped into the base of same, then a length of thin clear tube slipped over this fitting and the fuel level can then be checked against the carb itself........should be just bellow or level with the base of the mixture adjusting screw........this level is often not correct and will affect the general running.......plug checks are worth doing and a slightly sooty look is normal, but not absolutely black as this is obviously too rich.........Good luck with it all.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 160554, member: 597"] Well it all depends on what slides you have........usually a number 4 is standard........a number 3 will generally be too rich.........there are 3 1/2 available as well.......and these can work ok, although i have found these to be rich as well.........If the carb parts are in good condition, then the first thing to look at is the float levels, as these will make the engine run rich........a quick check is to simply stand a couple of meters behind your bike with the bike upright, and check the visual alignment of the carb/bowl in relation to the vertical case/engine lines. If the bowl is high or low, you will see it quite easily........then simply rotate the carb complete via the clamp/bolt on the manifold stub and this willl put things in the ball park.........actually checking the float levels acurately involves making a simple tool from an old carb bowl attachment banjo bolt with a brass nipple drilled/taped into the base of same, then a length of thin clear tube slipped over this fitting and the fuel level can then be checked against the carb itself........should be just bellow or level with the base of the mixture adjusting screw........this level is often not correct and will affect the general running.......plug checks are worth doing and a slightly sooty look is normal, but not absolutely black as this is obviously too rich.........Good luck with it all. [/QUOTE]
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Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Throttle Slide Needle
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