1990 Yamaha pro 50

[hevysrf]

I have a new to me 1990 yamaha oil injected carb 50. Starts easily, compression on all 3 about 120#, runs nice mid range, but bottom spark plug is constantly wet, and it seems to leak fuel out the exhaust after my 10 min idle back to the dock.
Fresh plugs and a new ignition coil for the bottom cylinder didn't help.
Timing ok at idle, and advance linkage measurements are at spec.
Start enrichener soleniod will stall engine at idle, so I don't think thats leaking.
At idle in gear at the dock, If I pull plug wires one at a time, top 2 will affect idle or stall engine, bottom does not.
Strong blue spark evident when plug wire pulled.
Can anyone suggest the next step in trouble shooting? Thanks MartyD

[Allstar]

Maybe carb float stuck?

[Ray Neudecker]

Strong possibility of the cdi being bad.

[Ray Neudecker]

Check out the carbs first. A needle may be sticking. If you have fire at all plugs, CDI is good.

[DoktorC]

If it's got resistor style plug caps do an resistance check on them.

[oceantraveler]

#3 cracked spark plug???

[hevysrf]

Thanks guys, I'm still working on it. Plugs have been changed, coil secondarys are 3.2k ohms like spec. Pulled flywheel cover,flywheel has 3 paint marks, timing light hits one on every plug. I'm checking timing at idle ,in gear, tied to dock.
I going to start on fuel system, it just struck me that I never have to hit choke button to start cold. Thanks MartyD

[Fast Fred]

pull the carbs off,clean them, look at the needle and seat in number 3, chunk of dirt, hair, hose, or whatever is holdin the needle open.

[Jason Johnson]

Your fuel pump is leaking, $10.00 for a diaphragm. Pump the bulb, I'll bet it never gets hard.

[Fast Fred]

could be, unbolt it, squeese the ball, see if fuel comes out the back of the pump

[hevysrf]

Thank you gentleman, thank you scream and fly, # 3 needle seathad junk in it. MartyD