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FB460V 12.5 Kaw surge

Discussion in 'Mechanic and Repair' started by ProStreetCamaro, Feb 15, 2008.

  1. ProStreetCamaro

    ProStreetCamaro LawnSite Platinum Member
    Messages: 4,289

    We have an older |Scag 36" WB with the 12.5 Kaw FB460V engine. The entire machine only has about 300 to 400 hours on it at most. 2 months ago I started it just to let it run a while because it hasnt been started in a couple months. It ran perfectly fine. Now the other day we go to start it again to get it ready to sell and it is now surging like crazy.

    At first it was doing it all over the throttle range. I took the carb apart and cleaned it up and blew it out. After that it was surging all over the place except at idle. Today I took it all apart and put a complete carb kit in it and cleaned it out again with carb cleaner and compressed air. Now it surges at anything above 1/2 throttle and under that it runs fine.

    Any ideas what is going on with the engine? :cry:
  2. mowermankevin

    mowermankevin LawnSite Senior Member
    Messages: 270

    Pro Street, Have you checked steady fuel supply? What happens with a can of ether for fuel with the air cleaner absent? I'm working on several Kawa's with the same problem, since the carb is new,do you think there is an air leak anywhere on the choke shaft or carb butterfly shaft? Sounds like an air leak somewhere. Love the old Camaros,Keep 'em going!!! Post back let us know,O.K.

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