Spark plugs

[Shack]

I’m just curious, ‘20 ar240, i pulled the spark plugs and put a couple shots of fogging oil down the holes last fall for my winterizing. Changed the oil this spring and took it out for its run and checked the oil on the water. Everything ran great, 48mph with wife and kid in the bow. I was gonna change plugs after the first outing but I decided to run them again for the second outing. Everything was perfect. Probably a dumb question but is there any reason to change them out? I plan on just keeping the new ones on the boat til I actually need them. Don’t fix what isn’t broken, right?!

 

[Acard7]

I’d rather change them now and keep the old ones as backup, haha. But hey if it’s working might as well roll with it!

 

[EricE]

I just follow the recommended maintenance which says check every 12 months or 100 hours.
Some replace yearly since they are checking them anyway.
I haven't changed mine and I have 70 hours on my 2020 212s.
I haven't lost any performance either.
I'll check them at the end of the season and replace if necessary.
I would say if your don't have any issues, check them at the end of the season, and replace if necessary.

 

[Babin Farms]

Totally up to you on replacing them. If you end up running them at least put the new ones somewhere in the boat in case you need to change one or more out while on the water.

 

[FSH 210 Sport]

I just changed mine yesterday because I was starting to see a drop off in max rpm’s. Posted this thread about it…https://jetboaters.net/threads/restored-performance-with-spark-plugs.38204/

As @Acard7 says he just changes them at the beginning of the season and is done with it, the plugs are inexpensive, and he is good to go for the season.

I took the run them and see how long they last approach this time. In the past I had changed them at 10 hours and 83 hours, and now have 193 hours, so I got roughly 110 hours out of this set. I still find it interesting that these motors seem to go through plugs so quickly, as you can see from the thread I did, they did have some wear on them. I don’t fog my engines over the winter.

I think it’s a matter of how many hours you have on the plugs, and your tolerance level for the performance drop off on a day on the water when the plugs need replacing.

 

[Shack]

Thanks for the reply’s. New plugs are on board and ready when needed. I just wasn’t sure on doing the fogging and then to keep using the same plugs. I know fogging is a whole other huge debate, lol. First boat and trying to do things right. This forum is awesome!!

 

[biffdotorg]

I just changed mine yesterday because I was starting to see a drop off in max rpm’s. Posted this thread about it…https://jetboaters.net/threads/restored-performance-with-spark-plugs.38204/

I think it’s a matter of how many hours you have on the plugs, and your tolerance level for the performance drop off on a day on the water when the plugs need replacing.

This is a great answer. Inspect your plugs, gap them, and replace when you notice RPM drop's or performance changes. I'm starting my third season on these plugs, and I noticed a bit of RPM drop. Its now time to pull them and inspect. I may get by with gapping and cleaning and the motors will be fine.

Keep in mind, these are not two stroke snowmobiles (that could foul a plug out on the trail at any time) These machines burn dirtier than a car, but not that bad. There is a fine line between preventative maintenance and just being wasteful. They don't go bad like clockwork. Do it when it is needed.