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K&B 7.5 inboard Help please

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K&B 7.5 inboard Help please

Old 09-06-2003, 02:36 AM
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Default K&B 7.5 inboard Help please

I just got a boat with a K&B 7.5 inboard.
It has what I believe is an 81-8905 Red body carb. on it and I can't get it to do anything but idle.
It will idle but if I give it throttle it will either bog, or remain constant, but when I let off the throttle it will rev up and then go back to idle.
Do I need the remote needle valve to get more than an Idle?

Also If I take the engine apart it has a flat disc with what could only be two possible settings inside that controls the intake ( I assume anyway). Should it be set to be fully open at bottom dead center?

Any help you could give would be greatly appreciated!

Thanks, Clint-A
Old 09-06-2003, 03:01 AM
Mr Cajun Gator
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Default K&B 7.5 inboard Help please

Sounds like you are not getting enough fuel pressure. With the carb in the ideal postion, the fuel has more of a suction on it. When the carb is open, it lets the air pass more freely, so that there is not as much a valcum on the fuel line. Check that the pressure line is open free flowing. Check the nipple on the pipe also.
Richen the needle between 1/4 and 1/2 turn.

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