582 acts like its running out of fuel

Re: 582 acts like its running out of fuel

by lindsey nammix » 10 years ago

lindsey nammix

0 3 0

I have a 582 and there are a few things that are worth checking.
Other than silly things like needles wrongly assembled or fuel pickup blocking and just about anything else
fuel quality is the first..new fuel?
oil mixture ok ? premix to test
floats getting stuck from gunk in fuel from long storage.. soak with methylated spirit to dissolve
Choke plunger not sealing ..remove and inspect.
is it both carbs or just one ? remove both floats immediately after failure and see fuel?

any way you need to do a lot more tests to get good help here like plug color? temps ? history of unit /fault

BUT BE WARNED if one cylinder is starving it will burn a hole in your piston please make sure that your fix is not a half fix.

check plug colors and be sure they match. egt would be useful in any case



please post your solution here when it is found for others in your boat

Re: 582 acts like its running out of fuel

by Paul Dalton » 10 years ago

Paul Dalton

1 2 0

Thanks for the reply. I done all of the things you mentioned as well as replaced all fuel lines, fuel pulse pump, primer pump, pulse line and disassembled both carbs twice and cleaned and inspected. No luck. I pulled both plugs and found them to be light brown like they are running lean. If I had a crank seal leaking could that cause this problem?

Re: 582 acts like its running out of fuel

by Nick Axworthy » 10 years ago

Nick Axworthy

16 325 0

mate of mine has a 582...had similar probs to you...he had checked the carb float needle valves...in the end he got a professional the look at the carbs...he found one of the needle valves sticking slightly.

New valve prob sorted.

Re: 582 acts like its running out of fuel

by lindsey nammix » 10 years ago

lindsey nammix

0 3 0

you will have to work out which cylinder

Light brown is ok ,dark brown is better but as they are not black it is not over fueling.


What are the float levels immediately after failure?

it they are low or almost empty they are running out of fuel which you already know

I had float sticking but that was one cylinder ..so its down to proving
more info

does it stop ?
how long until i runs fine again?
you will find it but it can be hard ..just prove one thing at a time ..first thing which cylinder?

then swap things ,,lots of work but they do allow lots of careful tear downs .

You have soaked the system with metho or alcohol?..then drained and dried after an overnight soak

Re: 582 acts like its running out of fuel

by Paul Dalton » 10 years ago

Paul Dalton

1 2 0

Im pretty sure its both cylinders because it doesnt miss. It it runs smooth other than the rpms dropping. Also it never will start running good again until you shut it down or let it run at low idle for a while. Then it will run again for 15 seconds or so. If you just let it idle or run it at lower rpms it seems to run fine. It really acts like it runs just long enough for the bowls to run out of fuel but i've pulled them right after it quit and both are still full.