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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="greg brillus" data-source="post: 179116" data-attributes="member: 597"><p>Although the 276/289 carbs look similar the 289 is actually much bigger than its smaller brother.......the airflow characteristics through both types is quite different.......Pilot mixture screws (the horizontal one, closer to the manifold) is an air screw, so winding this screw out further will lean off the mixture, inward will make it more on the rich side.......Normal starting point for tuning is to set the screw 1 1/4 turns out from fully seated......I would start by winding each in one at a time and note the exact amount of turns it takes to seat the screw........So long as the carbs are a good snug fit on each manifold, not loose and sloppy once the clamping screw is backed off........with the bike on its center or rear stand (bike upright) stand behind the bike and check that the rear carby is level and square to the engine (bowl vertical and not tilted to the left or right) do the same for the front carby standing in front of the bike looking rearward........the float levels will affect the running, and noticeably at lower engine speed......So a quick check will give a good starting point.........No good trying to lean off a rich running cylinder if the float level is too high.....The pilot jets in the jet blocks of the larger 229/289 carbs do need to be opened up but not too much........20 thou is ideal, 22 or more will be too rich. We will need more info before much more help can be given at this stage........</p></blockquote><p></p>
[QUOTE="greg brillus, post: 179116, member: 597"] Although the 276/289 carbs look similar the 289 is actually much bigger than its smaller brother.......the airflow characteristics through both types is quite different.......Pilot mixture screws (the horizontal one, closer to the manifold) is an air screw, so winding this screw out further will lean off the mixture, inward will make it more on the rich side.......Normal starting point for tuning is to set the screw 1 1/4 turns out from fully seated......I would start by winding each in one at a time and note the exact amount of turns it takes to seat the screw........So long as the carbs are a good snug fit on each manifold, not loose and sloppy once the clamping screw is backed off........with the bike on its center or rear stand (bike upright) stand behind the bike and check that the rear carby is level and square to the engine (bowl vertical and not tilted to the left or right) do the same for the front carby standing in front of the bike looking rearward........the float levels will affect the running, and noticeably at lower engine speed......So a quick check will give a good starting point.........No good trying to lean off a rich running cylinder if the float level is too high.....The pilot jets in the jet blocks of the larger 229/289 carbs do need to be opened up but not too much........20 thou is ideal, 22 or more will be too rich. We will need more info before much more help can be given at this stage........ [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Bafflement
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