Spark Plug Choice 1987 XP150 Evinrude

[muchco]

Just wondering the merit of surface gap plugs? I have been told that they are only designed for sustained high speed operation, any amount of idling and they are useless. What plugs work best in this motor?

 

[bubbakat]

Re: Spark Plug Choice 1987 XP150 Evinrude

all i am showing in my book is a UL77V OR QL16V<br />Which both of these plugs are surface gap plugs

 

[muchco]

Re: Spark Plug Choice 1987 XP150 Evinrude

Was that UL77V or QL77V. My understanding is that the Q is a resistor type plug.

 

[bubbakat]

Re: Spark Plug Choice 1987 XP150 Evinrude

That is listed as ul77v you are right on about the Q being a resistor type plug.

 

[Dhadley]

Re: Spark Plug Choice 1987 XP150 Evinrude

You can also use the standard (Q)L77JC4's.

 

[muchco]

Re: Spark Plug Choice 1987 XP150 Evinrude

Thanks, It's probably advisable to stick with the resistor type plug? Any preference between the surface gap QUL77V and the standard QL77JC4?

 

[walleyehed]

Re: Spark Plug Choice 1987 XP150 Evinrude

The std type, QL77JC4 will Idle a bit better, but if most of your time is spent at cruise or high-end, the surface gap is great.

 

[muchco]

Re: Spark Plug Choice 1987 XP150 Evinrude

Thanks, for the advise, greatly appreciated.