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Recently overhauled a ‘68 CB350 K0. She didn’t come with carbs so I bought some vm30’s.

I seem to get a slight backfire in right carb when accelerating. Intermittent power and backfiring.

any idea what it could be. Been playing with the air screw. Timing was spot on a few weeks ago when I set the timing. Maybe it’s out after riding for a couple weeks?

pics from when I bought her and how she sits now….
 

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Lotsa times,spitting back through the carb throat coming off idle is the sign of a lean misfire, caused by a too-lean idle circuit or the wrong slide cutaway .
 
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