Author Topic: CB400F Carb issue  (Read 3396 times)

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Offline steam-powered man

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Re: CB400F Carb issue
« Reply #25 on: February 08, 2013, 06:53:14 PM »
i'd check for a good, strong, blue spark (hasn't been mentioned yet) by "flicking" the points, and check the timing with a light.  also, spark advance free to move?  out of the box a little, but .................     
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Offline hondamatteo

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Re: CB400F Carb issue
« Reply #26 on: February 08, 2013, 07:07:45 PM »
Have you disassembled your carbs at one point? If the slides are installed backwards it will run way too rich.
'74 CB350F

Offline crazypj

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Re: CB400F Carb issue
« Reply #27 on: February 08, 2013, 08:40:33 PM »
Pilot jets too big, needles too high?
 I do a lot of CB360 carbs, some aftermarket kits have the correct stampings on jets but the sizes are all over the place
Did one yesterday that was stamped 35 but really about 28 but Ive had '35's' all the way to 45~47 (bigger than 45, smaller than 50, can't measure the half sizes without spending a LOT more money)
Had main jets marked 100 that were 90's, 110's that were 125, they just seem to mark stuff and throw it in bag
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Offline stevenclemmons

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Re: CB400F Carb issue
« Reply #28 on: February 10, 2013, 04:08:43 PM »
ordered some smaller pilots, going to put those in and re-clean the emulsion tubes. slides are in properly and I'll check the spark when I re assemble the carbs, thanks for the help, feel like i'm finally getting close to a long awaited solution here!