spark plugs

[billbo]

How often do you change your spark plugs. I have a Mercury 150 horsepower and did not change them this year.

[fishfordollars]

I run a Mercury 150 and for piece of mind I change them out every six months. Keep the old ones handy just in case i foul one, although I have yet to do that.

[Catt]

I've not changed mine in 2 years but I do check them monthly & keep a new set onboard.

[Jig Man]

Every 100 hours which translates to about once every 2 years.

[bass or bass ?]

I change mine twice a year in my 1967 Evinrude 80.

[sodaksker]

Sorry to hijack the thread but, what damage could be cuased by not changing them regularly?

[fishfordollars]

Sorry to hijack the thread but, what damage could be cuased by not changing them regularly?

Poor performance, hard starts, and possibly fouling one from extended idling time.

[NBR]

I inspect all of them once a year and single plugs from time to time and like Catt I keep a spare set in the boat. Years ago I changed and inspected the plugs more frequently but with my 159 I run it pretty hard or not at all and it is far less prone to fouling.

[Way2slow]

I keep a spare set in the boat that I have already index'd and numbered for which cylinder they go in.  I change my plugs when they start causing a problems or until I've run them to the point that I think it's time.  I've been running the same set of plugs in my DFI motor for about three years, and for no more than I'm fishing now, I may run them another three years.   On my two hot rod motors, 50 - 75 hours is about all I can usually get out of a set.

[keukasmallie]

I have a VP 135 hp engine in my Glastron GS 185 Ski & Fish.  I store it for five months of the year.  I change the plugs after I run the tank full of stored gas (treated w/ Stabil) out of it in the spring.  I figure $25 for plugs is a good investment for a six month period of boating and fishing enjoyment.

[South FLA]

Change mine based time interval manufacturer recommends.   

[fishn hard]

150 Mercury Should use NGK BU8H and you can get them for about 1.65$ each for that price I would change them every month if you fish alot mine cost 4.85$ and i change them ever month weather they need it or not But thats just me