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View Full Version : Plugs for LQ9? When? What?


rhsprostar
09-10-2007, 10:56 AM
Hi
Hoping you guys can answer a question for me.
I am wondering at what interval i should change the plugs on my LQ9?
It does not specify in the manual.
I was also wondering about the right replacement plug for that motor.
The 2004 manual has different plugs listed in different parts of the manual?? AC 41-950 or AC 41-952
the 2005 manual lists AC41-974 or AC 41-985 depending on where you look in the manual?
I haven't actually looked at the plugs in the boat yet, but does anybody know which is the right plug?!
thanks in advance

rhsprostar
09-11-2007, 09:49 AM
Wow............. no one?

TMCNo1
09-11-2007, 10:37 AM
I would remove a plug and get a new set like what it came with, unless you are having problems with the original plugs.

MYMC
09-11-2007, 10:41 AM
Wow............. no one?
A new spark plug has been released. The new spark plug has an
Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, ACDelco Part Number 41-985 (12571164), is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed to the gap required with the Platinum plug, or damage to the spark plug may result.

They should be changed every 100 hours.

rhsprostar
09-11-2007, 03:51 PM
Thank you. I will grab a set and leave the gap alone.
In cars you usually don't have to change those plugs for 60000miles?
Anyway i guess boats are different.

MYMC
09-11-2007, 04:39 PM
Thank you. I will grab a set and leave the gap alone.
In cars you usually don't have to change those plugs for 60000miles?
Anyway i guess boats are different.
LQ9's in boats have had a history of acting funny if the plug change interval is not followed.

Cloaked
09-11-2007, 04:45 PM
Hi
Hoping you guys can answer a question for me.
I am wondering at what interval i should change the plugs on my LQ9?
I change plugs each spring season. I could not imagine wearing out a set of spark plugs throughout the course of one skiing season, other than fouling a plug.