440cc duromax won’t start

[ReSydro]

Won’t start back up changed out oil, gas, spark plug and ignition coil. It has a weak spark when tested. Plz help I love her

 

[Rat]

Won’t start back up changed out oil, gas, spark plug and ignition coil. It has a weak spark when tested. Plz help I love her

Start by resetting the air gap on the coil, 0.30 if you have a set of feeler gauges... if you don't then a piece of paperboard from a cereal box, soda carton, or beer carton will be close enough.

That should help, but if it doesn't the next step I'd suggest for a weak spark is unscrew the spark lead from the coil and the gap, trim 1/4" off each end, squirt some dielectric grease into the coil, and the cap before screwing it all back together.
They do often put a drop or two of superglue to keep them from unscrewing from the coil but it tends to cause more issues than it prevents.

The real question is at what point was there trouble, like what changed before it wouldn't run?
Something else to consider is coil orientation. The factory coil on my 208 was positioned spark lead facing down, when I replaced the coil with one that doesn't have internal resistors and an rpm limit I copied that and had weak/no spark which was corrected by simply flipping the coil over.

 

[ReSydro]

I’m goin to try that asap. I had trouble when I went to start it back up this summer. It started for like 40 sec then shut off and never start back up.

 

[Denny]

Have you cleaned out the carb?

 

[ReSydro]

Yes took it apart carb cleaner. Made sure jets were clear all new gas lines float bowl still good.

 

[ReSydro]

I have a spark now but no engine turn over.

 

[ReSydro]

Don’t know what size jets to use on this?
Pic

 

[ReSydro]

 

[Rat]

Don’t know what size jets to use on this?
Pic View attachment 147712

I'd use what what in it that it ran on last as a guide as well as the color of the spark plug you replaced.
If the plug was dark, you were rich, if it was pale you were lean, in my experience it's a lot harder to start an engine that is too lean than one that is too rich. The difference being the lean one just won't catch an idle if it pops off and the rich one will but as it get to temp it will just flood and stall

 

[ReSydro]

Ok mine was too rich then. I don’t know how to change the mixture on this carb. It has 45 and a 165 jet. The factory jet didn’t have a number on them. And the two screws under the intake idk what they are for? Air and gas mixture?

 

[Rat]

Ok mine was too rich then. I don’t know how to change the mixture on this carb. It has 45 and a 165 jet. The factory jet didn’t have a number on them.

So hou go down one size at a time on that 45 until it starts and holds a good idle.
ALWAYS start withbthe pilot because a rich pilot will run the main too rich. One must remember that all the carb circuits "come on" in stages, but ONLY the choke/enrichment circuit ever turns off.

And the two screws under the intake idk what they are for? Air and gas mixture?

Honestly that's a weird Azs carb and they look like jets to me... I wouldn't run that carb on anything of mine, JS

 

[John Roger]

have you tried stater fluid? if that doesn't work then is the compression still good

 

[ReSydro]

Would the hole in this rubber seal mess up compression???

 

[ReSydro]

Ok I’ll try that. So the idle pilot is the small number jet? The 45?

 

[ReSydro]

I tried starter fluid still nothing I have a compression kit coming tomorrow. That’s y I ask about the seal. Previous post pic

 

[ReSydro]

Over time will the rockers loosen??

 

[John Roger]

depends i have never had that happen but it is a possibility is the head gasket good? also how old is this engine?

 

[John Roger]

Would the hole in this rubber seal mess up compression???View attachment 147759

no because you can even leave the valve cover off and the engine will still run what would be the problem is if the head is leaking or the head gasket

 

[ReSydro]

Yes the gaskets are all good. The engine is 3 yrs old. Been taken good care of.

 

[ReSydro]