WANDERING RPM

[ejbtech1]

"Ok I am back with another pro

"Ok I am back with another problem.............
My boat has done awesome so far, but I had a problem today on the lake.
The rpms tend to surge. Like about 500 rpm up and down tryin to go full throttle. You can feel the boat pull and slow down.
It really doesn't matter if it is 1500 or 4000. It wants to surge. I had a problem wit my float, but I really don't think that is it.....
The weird thing is that it does ok one day and the next, like today, it does worse.
Yesterday was good. today it surged..... Weird.
I only got 4000 at full throttle today. Yesterday was 5500. And smooth.
I know its in the carb. Any ideas?"

 

[haffiman37]

I would guess You have a stick

I would guess You have a sticking float valve.

 

[ejbtech1]

"Thanks Mort, that's kinda

"Thanks Mort, that's kinda what I thought. Not sure tho........"

 

[haffiman37]

It might as well be a sticking

It might as well be a sticking anti siphon valve on the tank.

 

[fastjeff]

Or a vacuum leak in the intake

Or a vacuum leak in the intake.

JEff

 

[bayliner_50]

"Eric. I had the same problem

"Eric. I had the same problem, it ended up being a faulty anti siphon valve, take it out and clean it ...By the way, were you about a 1/4 of gas left?"

 

[ejbtech1]

"Why yes I was......Thanks, I

"Why yes I was......Thanks, I will check that.
Unfortunately, My season is over. I have experienced a lot of blow by on my last trip out. I think I am going to have to pull the engine AGAIN!!!!!
But I appreciate your opinion!!!"