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  1. M

    exhaust flappers

    I have a 2000 fourwinns with a volvo 4,3gl perfs sx drive(black).Have a wot issue .when going to 3/4 to full throttle motor just bogs, back off throttle and goes great from 1/2 to 3/4throttle .everything from timing to ignition to carb(new holley 2300) have been gone thru and or replaced.Can a...
  2. M

    possible carb issue?

    i have a 2000 volvo penta 4.3 gl pefs engine boat runs good on start up. recently it started to backfire thru carb.loses power then regains it back . carb is a holley 2300. it seems like it only does it when in in rough water or when running thru waves from fellow boats.it happened when running...
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