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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Comet Carburation
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<blockquote data-quote="greg brillus" data-source="post: 120751" data-attributes="member: 597"><p>like all later designs of carburetors either for cars or bikes, the manufacturers made them run more efficient and lean.......even the stock TT/ XT 500 Yamaha's could be a bitch to start if you didn't use the choke. Problem with most bikes is you tend to open the throttle as you come down on the kick start lever and this definitely does not help with later type carby's especially on a hot motor. The bypass chokes on these later carb's is really just a tinny carb on its own.......so the enrichening feature of the "Tickler" is lost. These are things you need to remember when using either Mk 2 concentrics or Mikunis on early engines, where they had not only a tickler but an "Air dam" for the choke device..........both of these can readily over-choke an engine weather hot or cold. Of course the good old Dellorto is really the winner on account of it's accelerator pump that directs a fine jet of fuel down the mouth of the carb, and this works very well at enrichening the mixture for starting...... But the main function here was to overcome a huge flat spot for an engine sporting a pair of 40 mm PHM's that ordinarily ran perfectly with a pair of 32 mm ones.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 120751, member: 597"] like all later designs of carburetors either for cars or bikes, the manufacturers made them run more efficient and lean.......even the stock TT/ XT 500 Yamaha's could be a bitch to start if you didn't use the choke. Problem with most bikes is you tend to open the throttle as you come down on the kick start lever and this definitely does not help with later type carby's especially on a hot motor. The bypass chokes on these later carb's is really just a tinny carb on its own.......so the enrichening feature of the "Tickler" is lost. These are things you need to remember when using either Mk 2 concentrics or Mikunis on early engines, where they had not only a tickler but an "Air dam" for the choke device..........both of these can readily over-choke an engine weather hot or cold. Of course the good old Dellorto is really the winner on account of it's accelerator pump that directs a fine jet of fuel down the mouth of the carb, and this works very well at enrichening the mixture for starting...... But the main function here was to overcome a huge flat spot for an engine sporting a pair of 40 mm PHM's that ordinarily ran perfectly with a pair of 32 mm ones. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Comet Carburation
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