please help me possibly carb

[ernie36564]

as far as timing, it is set and i know it has new plugs cause head was replaced with brand new one. it has points and i am not sure how to check them. i think the carb must be off some because it has a miss or surge at mid throttle when wot its smooth and idle is smooth choke is opening fully. it had 2 year old gas in it so i put new in it and today i put a 16p pitch prop on it with a plastic gas tank never used before with about 5 gal of prem. gas in it instead of using the tank on board and at half throttle still had a surge to it. with the 16p it turned about 42-4400 30-31 mph with 3 adults and small child. boat states it will hold 1400 lbs or 7 ppl. oh i checked the fuel pump bowl and it had alot of debris in it with a rock filter that was somewhat clean. filter in carb was clean as well.

 

[watermellonI]

Re: please help me possibly carb

Hey Ernie,
Sure sounds strange if your idle and wot are good in between should be good as well.
Does this carb have a single needle valve on it?
I am assuming you ran the boat long enough to get the fresh fuel flowing.

How about your trim? Prop blowout will cause an engine surge and so will prop slippage. I see you went to a smaller prop and got your wot to where it should be.