‘88 Johnson 40 idle jet spits fuel

[willstutely]

1988 Johnson 40

Getting fuel spitting back out the idle air jet. Does it at idle and also at WOT.

Motor doesn’t run well at WOT. Used to get 32mph. Now only 20 and it struggles to get there.

130psi in both cylinders. Less than 3% leak down in each cylinder.

New Carson Reed valves
All new ignition components from under the flywheel to the plugs

Rebuilt both carbs but the bottom one is the one spitting and like I said it’s spitting out the idle jet.

Just took that one apart again and cleaned again, running wire through the orifices. Removed the lead plug again and did the same thing. Lots of carb cleaner.

At what point do you start thinking the carb itself is “bad?”

Thanks

 

[racerone]

Those carburetors are quite good / simple / reliable.----I would just install the good factory reeds again.----Then test run.

 

[Faztbullet]

Piston scuffed on exhaust side

 

[tphoyt]

If you were using wire on the ideal jet you may have damaged the plastic seat. Did you replace that seat? Not many people do or even know it exists.

 

[Faztbullet]

There is not plastic under a fixed jet

 

[tphoyt]

Roger that looking back on the year of this motor I’m over 10 years off. Sorry