Kaw fh580v smokes black and surges-hunts

[Red Good]

Pressure test the carb needle yet?

Had a 2 X 2 hole in the side of the block when I got it , patched that and bought a set of rods and pistons and a gasket set . Run it thru the hot tank a couple of times so its clean as its been since it left Kwacker ville .

 

[slomo]

Pressure test the carb needle yet?

 

[bertsmobile1]

Only really 1thing that cause black smoke from the exhaust , partially burned fuel
So that leaves you with
Excessive fuel coming in
retarded spark
valve timing out

 

[Red Good]

How can valve timing or spark be out when fuel is restricted it cleans up and runs fine . Would those 2 not be affecting it regardless of fuel flow ?

 

[slomo]

How can valve timing or spark be out when fuel is restricted it cleans up and runs fine . Would those 2 not be affecting it regardless of fuel flow ?

Because 98% of most people never adjust valves and hit stumps and log chains in the yard.

 

[slomo]

used a pair of pliers to pinch fuel line to about 1/2 flow , takes a minute and it cleans up and runs fine . Release the pliers and it goes back to hunting and smoking black . What the heck is going on ?

Sounds like excessive fuel entering the bowl. As in the carb needle is not working proper.

You choke down the fuel line and engine smooths out. Great you are on to something. I keep asking if you pressure tested the needle yet. Nothing back from you but crickets......

Or your carb float is not set proper. Allowing too much fuel into the bowl. This condition will cause a rich condition. Something is off.

Take pictures of everything you've worked on. More evidence the more we can help.

 

[bertsmobile1]

The volume of fuel that can be sucked into the engine will vary according to the height of the fuel in the bowl
restricting the fuel supply causes to level in the bowl to drop so less fuel gets into the engine
You get black smoke from a retarded spark because the flame does not have enough time to burn all off the fuel that has entered the cylinder or because the piston has past maximum compression so you get a lazy yellow flame rather than a strong blue one
Petrol burning in a dish has a yellow flame & black smoke .
Similar story with valve timing combustion occurs at less than optimal cylinder pressure so you get a slow yellow sooty flame .

 

[Red Good]

Brand new kawasaki carb , how do you adjust float or needle on a plastic float ?

 

[bertsmobile1]

I doubt that it will be wrong on a genuine brand new carb but you warm the tang gently with a hot air gun & bend it

 

[StarTech]

so you spent around 300 usd for a new carburetor?