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Please Help...Engine oddity |
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GottaSki 
Grand Poobah 
Joined: April-21-2005 Location: NE CT Status: Offline Points: 3365 |
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 Topic: Please Help...Engine oddityPosted: August-24-2007 at 11:54am |
Try reducing the choke. Most these boats with the choke set straight up the middle end up with too much choke for too long. |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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joelhern2
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Joined: February-23-2006 Location: United States Status: Offline Points: 22 |
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Posted: August-23-2007 at 10:50pm |
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2oth century--
yeah, mine smokes during start-up too. basically, when its in idle... |
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20th Century
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Joined: August-18-2007 Location: United States Status: Offline Points: 31 |
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Posted: August-23-2007 at 9:07pm |
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I had a similar problem, but mine would smoke some on start up too. Wound up I had a pinhole in one of my brass floats. The gas ended up washing down into the crankcase from the full carb after each use and the oil got contaminated. I was very suprised at how much gas got in (or how little it takes to wreck your oil). I wonder if your oil is getting diluted and dropping your pressure.
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behindpropeller
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Joined: July-31-2006 Status: Offline Points: 1810 |
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Posted: August-22-2007 at 7:55pm |
Why would multi weight spin bearings? |
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backfoot100
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Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Posted: August-22-2007 at 4:14pm |
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Take the flame arrestor off and look down the carb bore when you decellerate. I would assume that there is gas dripping into the carb when you get the black smoke causing a rich condition. A float is stuck and/or misadjusted or there is a needle and seat that is dirty and letting gas go through when it shouldn't. It's only happening when you throttle down because the gas being thrown forward in the bowls of the carb. I would just guess that a float is the problem. If it was a needle/seat I think you would be seeing a rich condition all the time instead of just when you decellerate but I could certainly be wrong.
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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joelhern2
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Joined: February-23-2006 Location: United States Status: Offline Points: 22 |
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Posted: August-22-2007 at 3:45pm |
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I received this from the mechanic at Mid-West Correct Craft:
The warning system on your boat while state of the art at the time has been problematic over the years. I would be more concerned what your oil pressure says. You should be using SAE 40 oil not a multi grade like 10W40, I have seen 454s spin bearings with multi grade oils.I would suspect you may need a new carburetor. You should tune up the engine & check that the Choke is opening properly before you make that decision. As for excessive gas/oil in bilge You should check for leaks. I currently use Valvoline High Performance 40 W oil...we did have the carburetor adjusted last year due to the seating mechanism. Probably should replace the carburetor? Or should I get one of those Holley carb kits? |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3365 |
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Posted: August-21-2007 at 4:38pm |
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Black smoke is typically carburation, needle/float issues.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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joelhern2
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Posted: August-21-2007 at 4:11pm |
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Thanks for the input guys. It has 420 hours on the engine. I haven't put many hours on her this year at all and it recently sat in storage for close to 2 months prior to this past weekend. Last year we probably put 140-150 hours on the boat.
I did notice this past weekend that the bilge was pumping out water that looked like it had more discoloration in it than ever before. By discoloration I mean, it looked to be gas/water mix or gas/oil mix. Also, when we slowed down to idle speed the engine vibration was very noticeable and not normal. It would only seriously vibrate occasionally, but the black smoke was pretty constant when we decelerated. Let me know your thoughts and thanks in advance. |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: August-21-2007 at 7:59am |
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Joel, How many hours are on the engine and what kind of use has it seen. I have a feeling that it's time for a compression and leak down test to determine how sick it is!!!
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BuffaloBFN
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Joined: June-24-2007 Location: Gainesville,GA Status: Offline Points: 6094 |
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Posted: August-20-2007 at 2:04pm |
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I'd check a few more things and give the pros here some history on the boat...
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joelhern2
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Posted: August-20-2007 at 1:42pm |
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This past weekend my "Oil" light would flash and the alarm would beep a few times and then go away (seemed to beep and flash 2-3 times and then stop).
Also, every time I slowed down to pick-up the rider black smoke would start coming out of the stern of the boat. Any ideas? I checked the oil level...that was good. I checked the engine temperature...that was good. |
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joelhern2 wrote: