Stalling with new plugs

[Dirty Worm]

I have a 2001 70Hp Johnson O/B(oil injected). Recently changed spark plugs. The old plugs were for small 2 cycle engines. I replaced with the recommended Marine plugs gapped at .30. Now I have occassional stalling when idling.<br />I noticed the old plugs had a much wider gap, I did not measure the gap but it was visibly wider.<br />Could too small of a gap cause a low idle stall problem? Any suggestions? It ran fine before changin the plugs.

 

[Dhadley]

Re: Stalling with new plugs

Well, let us in on what plugs were in it and what we went to. Kinda hard to see from here. <br /><br />On the other hand I'm sure it would idle funny gapped at .30 (I'm sure you mean .030)

 

[Dirty Worm]

Re: Stalling with new plugs

Sorry,<br />The plugs I took out were Champion L77JC4 gapped at .040.<br /><br />The new plugs are Champion QL78YC gapped at .030.

 

[Dhadley]

Re: Stalling with new plugs

Either will be fine although I prefer the 77's as they are a bit cooler. <br /><br />Has the motor been sitting?

 

[Dirty Worm]

Re: Stalling with new plugs

No, the motor is run every weekend.<br /><br />Any idea on why the motor would stall, it starts right back up.<br />Could it be bad gas, or fuel filter?

 

[rickdb1boat]

Re: Stalling with new plugs

Might be running a little lean at idle. If you have low speed adjustment screws on the carbs, I would back each one out 1/2 turn and see what happens. You may or may not have them on that engine..