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Thread: carbs on 45's

  1. #1
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    Default carbs on 45's

    Whose using ones with solid butterflys versus ones with cutouts?
    Did someone post that the solid was the original?

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    Solid are original, the cutout are from fishing motors. Both work, but the motor will idle high with the cutout. Somewhere there's a tech note about swapping out the plate, and I think there's something specific about the fasteners. SeaWay sells replacement solid butterfly plates with new fasteners.
    mini tunnel boats for sport, now an experimental Sport C added to the fleet.
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    Quote Originally Posted by BYOBoat View Post
    Solid are original, the cutout are from fishing motors. Both work, but the motor will idle high with the cutout. Somewhere there's a tech note about swapping out the plate, and I think there's something specific about the fasteners. SeaWay sells replacement solid butterfly plates with new fasteners.
    Thats great so you can then rebush a carb body

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    I don't think you can rebush when the butterfly shaft wears out the carb body. Just find a fishing carb in ok shape, use it's existing shaft, but swap to the full butterfly plate instead of cut one.
    mini tunnel boats for sport, now an experimental Sport C added to the fleet.

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    Quote Originally Posted by BYOBoat View Post
    I don't think you can rebush when the butterfly shaft wears out the carb body. Just find a fishing carb in ok shape, use it's existing shaft, but swap to the full butterfly plate instead of cut one.
    any reason to swap to the full butterfly plate?

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    Default for safety

    Quote Originally Posted by Powerabout View Post
    any reason to swap to the full butterfly plate?
    for Safety if you let off throttle the engine will shut off, APBA Rule.
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    Full plate also solved the idle issue. On the fishing motors, low speed idle rpm is controlled by retarding the timing, by still rotating the stator plate after the point where carb is on its idle stop. On racing motors the timing is locked full advanced, so the normal carb setup lets too much air in and the motor won't idle very low. The fix was the full butterfly plate to farther block air/fuel so the motor will run slower with the locked timing.
    mini tunnel boats for sport, now an experimental Sport C added to the fleet.
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