spark plug ? 1989 Evinrude 40hp

[bobjoe1]

I have a 1989 Evinrude 40hp with the vro disabled and mixing gas. I went to local dealer and asked for the QL78YC plug and he said that I should use the QL77JC4. Any remarks are appreciated. I put the QL77JC4 in and seems to run ok but would I get better performance and milage out of the QL78YC

 

[ezeke]

Re: spark plug ? 1989 Evinrude 40hp

The current listing for the 1989 recreational 40HP motor is the QL78YC.

 

[bobjoe1]

Re: spark plug ? 1989 Evinrude 40hp

Thanks but I was curious as to whether I would now need a suppressor plug since I disconnected the vro

 

[Howard Sterndrive]

Re: spark plug ? 1989 Evinrude 40hp

I don't see the connection between VRO and plug... I run the standard plug in my 1990 40HP and I premix. I get no excessive fouling. Use good oil and tell the dealer you just want the plug you want.

 

[bobjoe1]

Re: spark plug ? 1989 Evinrude 40hp

thanks but according to the charts if you dissconnect the vro you don't need a suppressor plug which is a Q in front and I seem to be using a whole lot of gas.

 

[Howard Sterndrive]

Re: spark plug ? 1989 Evinrude 40hp

according to the charts

charts?


check compression, check spark, run some seafoam through

unless you changed to a supression plug at the time fuel consumption increased, I don't see the logic

both plugs you reference have the Q so they're both suppression plugs

QL78YC is the one for your motor