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Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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1994 120hp looper back firing though exhaust

Customer Question

1994 johnson 120hp looper back firing though exhaust
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello. My name is Tan.

Does the engine back fire at any particular rpm? When the engine backfires does squeezing the primer bulb make the back fire quit or pushing in on the choke?

Customer: replied 1 year ago.
constant back fire at any rpm.pushing choke has no effect.
Customer: replied 1 year ago.
Please note that I do not want to subscribe to anything. Thank you
Expert:  Tan replied 1 year ago.

Ok we need to check for top dead center. Remove the # ***** spark plug and turn the flywheel till the # ***** piston is at top dead center. Once you have done that check the timing pointer and the mark on the flywheel. Does the pointer line up with zero or TDC on the flywheel? I use a pencil sticking in the spark plug hole and turn the flywheel till piston is to the highest point. The # ***** cylinder is the top right stbd side of engine.

Customer: replied 1 year ago.
done this exercise.
Customer: replied 1 year ago.
ok thanks
Expert:  Tan replied 1 year ago.

Is the engine doing this in the water or just on a flushing attachment?

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