View Full Version : 27hp Generac , fouling plugs

08-20-2011, 10:56 PM
Generac is on a 60 dixie , plugs keep fouling . Plug tips are a white color . Replace and run fine for 20-30 hrs then same problem. How do i adjust mixture . engine is a vert shaft.

08-21-2011, 11:24 AM
There's no adjustment for the high speed circuit, I would spray carb cleaner around the intake gaskets while running. If RPM's pick up replace the gaskets. Also pull the cylinder covers and check for debris in the fins causing overheating.

You are running NGK BKR4E plugs right ?


08-21-2011, 11:54 AM
Ive been running champion plugs. Another mechanic told me to run the ones you mentioned.This machine at idle will just pop and pop . Is there a correct gap for this engine. Thanks in advance.

Snyder's Lawn Inc
08-21-2011, 12:02 PM
I have one would foul the plugs I was told needed the values set
Thinking ok
The dealer was right stop fouling plugs

08-21-2011, 03:37 PM
Put the NGK plugs in and check the valves like Snyder's mentioned, Should be .003" both intake and exhaust.....

08-22-2011, 05:13 PM
Ill set them tomorrow . At least this enigine isnt a knuckle buster .The valley is pointing towards the back with easy access to both heads. Thanks guys.

Sharpcut 1
08-22-2011, 05:45 PM
.022-.025 plug gap at most, and get rid of those Champions. Generacs hate them.