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Engine shields noisy.

923 views 10 replies 6 participants last post by  fred_bridgehouse 
Good morning guys,

I've been working on a 425. It's a '94, so the carb is vent solenoid.

Let's assume components (fuel/electrics/compression) are in spec.

One thing I did notice is there is supposed to be a fuel tank "check valve". My tank doesn't have the hose or check valve, not do I see any fittings to attach hoses. I checked the manual and the manual states the 425 with the carburetor vent solenoid should have no tank cap vent. My cap is vented (tiny hole in cap)

Would having a vented cap on a fuel system not supposed to have a vented cap, cause idle/engine problems?

Pg 3-10 from the manual.
 
Thanks Fred.

Interestingly, I have another 425 with the bottom 1 wire solenoid. That one runs very smooth. In fact when I acquired it the carb was in terrible condition. Cleaning is very simple.

I'm just thinking perhaps something is physically wrong with my vent solenoid carb. Buying used is a crapshoot and $300 for a new one....

Dave.
 
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