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Old 16 May 2012, 20:20   #11
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Country: UK - England
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I have a bf40 and was told if it ever sits for a while run it dry or start it up on muffs every month. Fingers crossed its just tarnish.
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Old 17 May 2012, 02:08   #12
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The first thing I would want to know is which cylinder was misfiring. Usually the spark plugs will tell you which one is different from the others. Then start hunting for the problem. Sure sounds like fuel to me, and might just be a simple fix.

Short story: Yesterday my friends shows up with his neighbors lawnmower and asks if I could make it live again. I pulled the carb off and cleaned it up. When removing the fuel line, I noticed a lot of water. Grabbed a flash light and looked into the tank to find a 1/2" (13m) of water. Sucked the water and crap out of tank, put the carb back on, then proceeded to mow my lawn with it.

A cartridge fuel filter is a great addition to most any boat that doesn't have one. Hmmm...non of the four boats I have owned has had one when I purchased it, but all of them got one fairly quickly.
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Old 18 May 2012, 14:17   #13
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Boat name: Dirty Harry
Make: Avon Adventure 450
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Hi Guys,

So the carbs have been cleaned out in the ultrasonic bath and re-fitted to the engine, new gaskets on the whole carb assembly have been fitted. I've also balanced the carbs with a friend's vacuum gauges so all should be perfect as far as carbs go.

Cranked the engine up this afternoon and to my delight it started with the first turn of the key (normally takes a good bit of cranking to get going from cold). It settled down to a nice idle and I let it warm up for a while.

However, once the engine was warm I had a go at revving it up a bit and sadly the lag still persists. There's a real delay in the revs picking up, especially at the top end. Also, once the engine has been revved for a while, it goes back to idling very roughly at 400-500rpm for a few minutes before returning to it's normal 800-900rpm, (which i found quite peculiar).

I'll be using the boat this weekend so I'll have an update on how it goes on the water. I've attached a link to a quick YouTube vid of the engine idling/revving, its a bit windy but you can hear the throttle delay.




P.S. The boat has a Yamaha 10micron external cartridge filter/water separator so I wouldn't have thought it could be dodgy fuel, but I could be wrong.
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Old 18 May 2012, 14:20   #14
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Also, forgot to mention, it sounds like there's some knocking coming from the engine nowadays too...
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Old 18 May 2012, 16:02   #15
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sounds a bit like its running rich and/or the needles in the carbs are to high and need lowering. are you able to take it for a good blast and then take the plugs out and check out the colouring of them?
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Old 18 May 2012, 16:12   #16
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Hi Matt,

Yes I'll be taking the boat for a good run tomorrow afternoon, I'll hopefully manage to get a video as well.

Alex.
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Old 18 May 2012, 16:41   #17
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[QUOTE=clydeoutboards;462886]Hi

Oh and just so you know we have an ultrasonic bath here. we use it as standard as part of the service on all engines.

What would you do in your ultrasonic bath with my outboard engine when you serviced it ?
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Old 21 May 2012, 04:43   #18
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Hi guys,

Quick update. Had the boat out doing safety coverage for a regatta over the weekend there and gave it a good run. I think the carb cleaning and balancing has done the trick! The engine started from cold on the first turn of the key and never missed a beat all weekend. All in all, the engine feels like new again. Thanks very much for all the advice guys!
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