1988 J225 Loses fire to 1 or more cylinders

[BrianTindall]

Re: 1988 J225 Loses fire to 1 or more cylinders

For mine, as I posted above, it was not the coil. I replaced the power pack ($195) this afternoon with a new one. The engine seems to be running on all 6 as I'm getting 35kt top end. I still have to hook up the tach but I need to make a new gauge panel, the old holes are bigger than the new gauges. The engine does seem to be capable of more power, so I'm going to change to timer base with the one on my other motor. It doesn't seem like the Quick Start is working either. The manual says the timer base would likely be the fix for that. The magnets look to have been epoxied as well. Might just change the flywheel too.

 

[farginicehole]

Re: 1988 J225 Loses fire to 1 or more cylinders

Well hopefully you can take the flywheel from your "parts" engine - those things are WAY expensive! I had a bunch of chewed up teeth on mine (who knows what the guy that owned it before me did, but I'll bet it had something to do with the intermittent spark problem causing very difficult starting!!), so I had a guy in our toolroom who happily works for beer weld up 19 or 20 of these badly damaged teeth. Then I went after them with a die grinder to bring them back to shape. Came out beautiful, but it sure was a lot of grinding work. Sure beat $800 for a new flywheel though!

 

[BrianTindall]

Re: 1988 J225 Loses fire to 1 or more cylinders

OK, I took some time and hooked up the tach today. Ran 5800 rpm. Not too bad I guess. I still think it has more in it though. We'll just keep plugging away at it.

 

[beach nutt]

Re: 1988 J225 Loses fire to 1 or more cylinders

Originally posted by farginicehole2:<br /> So, beach nutt, I guess that answers one question I had. I was wondering if you got a new timer base when you ordered a new stator, but sounds like that's a big "no". The reason I questioned this is that my Clymer manual steps you through checking various items, such as charge coils, sensor coils and timer base, and then tells you to "replace stator" if any of these components fail. I'll read it again to make sure I'm not misquoting, but why would I replace the whole stator if the charge and sensor coils checked out okay and then the timer base check failed, especially if buying a new stator doesn't get me a new timer base?! Good luck to you too - I think all three of us are going to need plenty of it!

 

[beach nutt]

Re: 1988 J225 Loses fire to 1 or more cylinders

After spending a bunch of money on a power pack and stator. I did do some homework. The Power Pack is really two seperate systems, intregated into one unit. Older motors had two packs, one for each 3 cylinders. Thats why ther are 2 charge coils on the stator. So MOST of the time, if it is Power pack or stator related, you will loose fire on more than just one cylinder.<br /> If you look at the "potting" in the bottom of a power pack and see its melted in places, its most likly bad. As far as stuff leaking out of the stator coils.. The new one looks like a bunch of 6 year olds put it together. Not much for visual trouble shooting. <br /> And reguardless of what the Clymer manual says, and they are good. My boat in the yard with flush muffs, will run like a raped ape! It"s just under high temp/load conditions on the water it fails. So find someone with a Dyno to simulate at sea conditions. It will save you alot of money and part changing.

 

[beach nutt]

Re: 1988 J225 Loses fire to 1 or more cylinders

Originally posted by beach nutt:<br /> After spending a bunch of money on a power pack and stator. I did do some homework. The Power Pack is really two seperate systems, intregated into one unit. Older motors had two packs, one for each 3 cylinders. Thats why ther are 2 charge coils on the stator. So MOST of the time, if it is Power pack or stator related, you will loose fire on more than just one cylinder.<br /> If you look at the "potting" in the bottom of a power pack and see its melted in places, its most likly bad. As far as stuff leaking out of the stator coils.. The new one looks like a bunch of 6 year olds put it together. Not much for visual trouble shooting. <br /> And reguardless of what the Clymer manual says, and they are good. My boat in the yard with flush muffs, will run like a raped ape! It"s just under high temp/load conditions on the water it fails. So find someone with a Dyno to simulate at sea conditions. It will save you alot of money and part changing.

 

[beach nutt]

Re: 1988 J225 Loses fire to 1 or more cylinders

Originally posted by Brian Tindall:<br /> For mine, as I posted above, it was not the coil. I replaced the power pack ($195) this afternoon with a new one. The engine seems to be running on all 6 as I'm getting 35kt top end. I still have to hook up the tach but I need to make a new gauge panel, the old holes are bigger than the new gauges. The engine does seem to be capable of more power, so I'm going to change to timer base with the one on my other motor. It doesn't seem like the Quick Start is working either. The manual says the timer base would likely be the fix for that. The magnets look to have been epoxied as well. Might just change the flywheel too.

 

[Slammer3]

Re: 1988 J225 Loses fire to 1 or more cylinders

Brian,5800rpms are the max for your motor,you are ok. If you go any higher,you might have the motot cut out.(Safety feature) I would let a sleeping dog lie,seems like you got it fixed. As for the guages holes are to big,you might consinder making a new panel out of starboard or corian. When we changed my sister motor over from a johnson to Yammi,we made the new panel out of white corian and looks pretty good.

 

[beach nutt]

Re: 1988 J225 Loses fire to 1 or more cylinders

If your ring gear is good on the fly wheel. Its ok. If you do have any loose or broken magnets, you can buy new ones. They will come with an epoxy kit, throw it away and use "JB Weld" to hold them in place. Buy a piece of 7/16 wooden dowel rod and use it for magnet spacing between the 6 magnets. It"s bullet proof after that. And considering you are running an OMC Looper, they make a bunch of horsepower at lower RPM"s. I would say 5600 is the top on a stock motor. So prop your boat right or get a Merc. I have turned the V-6 OMC 7 grand before, but would not advise it

 

[BrianTindall]

Re: 1988 J225 Loses fire to 1 or more cylinders

Actually, I've been told to prop for a max of 6000rpm. The rev limiter is set for 6700rpm. The latest is the adjustment knob up by the flywheel on the throttle linkage has broken. Man does it ever end? Time for more parts! The thing about wanting or expecting more is based upon that I pulled twin 120hp Force's off this boat. Now at the prop they are maybe 110hp. Given that I replaced them with a 225hp, my speed should be similar. Original top speed was about 45mph, current top is about 40mph. This is with a 17" pitch prop. Basically I want to "Tune" everything so that it's all correct. I do have to raise the motor about 2". That might help some as well.