need help (stumped)

[lightingmcqueen]

ok here it is. i have a 70 rude 85h/p the proublem is that when i launch the boat starts up fine and idels fine take it out of the canal and open her up and she planes out fine (quick) runs fine for about 1-2 min and it falls on it's face .starts right up fine and will idel just fine but after a min or too as soon as you (wot) it will stall on a dime and not be able to plane back out . ok now i was told to check the tank and the pump did both .rebuild pump ,ran on a seperate tank (new) and still the same thing .......now im stumped i have rebuilt the carbs ,timing,plugs.wires,fuel pump,fuel tank.ok so i am asking is this a electral proublem. something getting hot and shutting down the motor ????or somthing else .i may have the idea that my floates are not right b/c when i re built them the kit diden't come with new ones i dident know. so do you replace the floates every time you rebuild the carbs ??? and also if you pump the primer bulb it does nothing to help keep the motor running .... oh yea and 1 more thing (sorry for a long thread) when you pump the bulb is it suspostoo get hard b/c mine dont you can keep pumping and the fuel will come out the carbs thats y i think my floates .....???????? please help not verry fun gooing out at idel....................

 

[HighTrim]

Re: need help (stumped)

the bulb should tighten yes after a few pumps. If you're pumping away you're flooding the carbs.Someone will jump in with the exact procedure to remedy this, im no carb expert.

 

[lightingmcqueen]

Re: need help (stumped)

do you know if that would be caused buy the flotes in the carb ??

 

[F_R]

Re: need help (stumped)

Well, partly anyway. The fact that they don't shut off the flow of fuel when you are priming indicates they are bad, or not adjusted correctly, or the float valve is leaking. Or you are mashing on the primer bulb super hard.

I don't think any of necessarily explains why it cuts out. But it could.

 

[77Lark]

Re: need help (stumped)

Floats / needle valve installed upside down?

I saw somewhere that the floats, if you look from the side should be parellel to the bowl

 

[Molaker]

Re: need help (stumped)

Interesting problem there, McQueen. Sounds like two problems though. Too much fuel - carbs dribbling when you pump primer bulb and too little fuel - shutting down at WOT.

I'd fix the carb problem first. Once the floats shut off correctly, then maybe the other is simply changing the primer bulb and making sure there are no air leaks into the fuel line between the tank and the bulb. Sure sounds like something is starving out your engine at WOT and you've not indicated you addressed the external fuel line & primer bulb yet.