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Author Topic: Keihin VB air cutoffs  (Read 103 times)

Offline Armaundk

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Keihin VB air cutoffs
« on: May 10, 2018, 10:11:04 »
Guys, would appreciate some feedback from those who know:

I'm rebuilding a pair of VB's off an '81 CM400 for someone and I know you can disable those air cutoffs with an appropriately sized piece of rubber in the air hole, however, as I don't really have a way to cut a perfectly-sized piece of rubber to fit in there, I'm thinking some black RTV in there would work just as well. Yea or nay? I'm trying to save him some money by not buying new diaphragms for those cutoffs and from what I've read they're not crucial to the carb's operation, anyway. In fact, I read that the Honda factory issued a bulletin back in the day to techs on how to disable them, too.

Anyway, some input is appreciated.

Offline irk miller

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Re: Keihin VB air cutoffs
« Reply #1 on: May 10, 2018, 22:15:50 »
RTV should work fine.  I would want to be able to undo the job if I ever decided to.  And no, you really don't need them.  They basically countered the backfire during decel when the carbs ran lean.  Carbs were typically tuned lean at the factory because of emissions.  I disabled them on XL250 and 350 carbs I've had.