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  #1  
Old 09-22-2004, 03:35 PM
ScottM ScottM is offline
Dieter Sprockets
 
Join Date: May 2002
Location: Marshfield, MA
Posts: 2,221
Default Electrical or Fuel Delivery?

Today I used my boat for the first time in over 2 weeks. It has an '89 225 Johnson which didn't want to run very well. It started no problem, I idled from the mooring out the river without issue (3/4 mile), but as soon as I throttled up to about 4000, the engine would bog a bit. The tach would drop 300-400 rpms and the boat would slow down a bit, then it would throttled up again. Below 4000 the engine ran fine, over 4000 up to WOT @ 5600 I experienced this problem. I'm not so sure it's fuel related because the engine wouldn't cut out. I did notice when I hit the trim tabs to make sure they were in the up position, the engine bogged, which leads me to believe it's an electrical issue. We did have lots of rain this past Saturday, so I'm wondering if the wires got wet? Anyone have any ideas as to what this could be?
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  #2  
Old 09-22-2004, 08:30 PM
Finster Finster is offline
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Default Re: Electrical or Fuel Delivery?

Scott, are you sure that doesn't say merc 300 on it? It sounds identical to mine...And I would think fuel. Water, Varnish, sludge, what ever...... Change the filter. You have a canister filter right? Pour it in a bucket and see what comes out. If it's water it will sink to the bottom.

Ahh. PM me and I'll give you my phone number if you don't have it all ready. Maybe I can help, though I have been known to be wrong.

Oh yeah, check all your grounds.
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  #3  
Old 09-23-2004, 06:28 AM
PipeDreamsMarine PipeDreamsMarine is offline
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Default Re: Electrical or Fuel Delivery?

Electrical.... sounds like a power pack problem, Check the small wires that run to the coils(trigger wires, not the plug wires) look for the green crap and dust. Thats what the problem with mine was. The bogging when you hit the trim switch sends me in that direction.. and what Finster said too.. check your grounds.... or bring it down and Finster,Scott and myself will hit it with rubber hammers for a few minutes and then take it for beers in 3to4's....That's the test of any boat repair
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  #4  
Old 09-23-2004, 11:36 AM
pogden pogden is offline
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Default Re: Electrical or Fuel Delivery?

Quote:
bring it down and Finster,Scott and myself will hit it with rubber hammers for a few minutes and then take it for beers in 3to4's....That's the test of any boat repair


[img]/images/graemlins/grin.gif[/img]

Personally, I like to drink the beers first then hit it with the hammer.

As far as the engine problem goes I would suspect it was what you were holding in your hand if it was a beer or a babe it would probably have run fine...or it wouldn't really matter anyway. [img]/images/graemlins/tongue.gif[/img]
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  #5  
Old 09-23-2004, 01:20 PM
ScottM ScottM is offline
Dieter Sprockets
 
Join Date: May 2002
Location: Marshfield, MA
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Default Re: Electrical or Fuel Delivery?

Thanks for the help guys. I'll check those areas on Saturday. If I can't figure it out, I'll drink lots of beers and hit the engine anyway. [img]/images/graemlins/grin.gif[/img]

Finster - PM just sent.
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  #6  
Old 09-23-2004, 04:12 PM
Abe's Rocket Abe's Rocket is offline
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Location: Maine
Posts: 368
Default Re: Electrical or Fuel Delivery?

I had a similar problem with a v-4 115, every one suspected it was the powerpack until we discovered a toasted cyclinder...good times.
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  #7  
Old 09-24-2004, 09:35 AM
John R John R is offline
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Default Re: Electrical or Fuel Delivery?

What's the best way to dispose of questionable pre-mixed fuel?
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  #8  
Old 09-24-2004, 10:38 AM
PipeDreamsMarine PipeDreamsMarine is offline
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Default Re: Electrical or Fuel Delivery?

Your lawn mower.. Pre mix is fine to run in your lawn mower, just don't leave it in there over the winter. Plus you can burn it in your weed eater and leaf blower. Coffee filters and the water will settle to the bottom.. the rest is good fuel.. That's what I do with the fuel I drain from the tank(premix) in the spring.
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"Design her right,
Build’er well
Bend the throttles,
And let’er eat…."
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  #9  
Old 09-24-2004, 02:54 PM
ScottM ScottM is offline
Dieter Sprockets
 
Join Date: May 2002
Location: Marshfield, MA
Posts: 2,221
Default Re: Electrical or Fuel Delivery?

Just spoke with a buddy of mine that had the same engine. Right before he toasted a cylinder 4 years ago, he was trimming the engine while underway and had the same surging/bogging symptoms. The mechanic said the cause of the engine blowing was lack of oil to one cylinder due to a clog in the carb, but as to why the trim had an effect on the engine bogging remains a mystery. Needless to say I'll be talking with my mechanic tomorrow.
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  #10  
Old 09-24-2004, 08:31 PM
Finster Finster is offline
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Location: Little Egg Harbor, NJ
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Default Re: Electrical or Fuel Delivery?

Scott, stop thinking too much. Just do those simple things Don and I said. Don't drive yourself nuts with mechanics if you don't have to.

I'll tell you about the fireball over a few beers....
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'98 15 Boaton Whaler Dauntless
There's more but w/e
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