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Old 15 November 2006, 14:02   #11
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IBWET,

Thanks for the offer! Engine is currently in my garage but I may be down at marina this weekend - if so I'll take the carbs off and give you a shout

Cheers,
Al
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Old 15 November 2006, 17:45   #12
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I re-installed the engine so yes, the cables have been altered, however the cables are not tensioned at idle (ie throttle on carbs sit at idle stop as far as I can tell). I don't think would have a huge impact on not running at idle? as it doesn't "idle" till rev's are pretty high. It's not like it's dying due to running just a little bit too slow. The speed it will run at (fast idle) is fast enough that I certainly wouldn't want to put it into gear at those rev's - I'm guessing 2500rpm.


That doesn't sound like jets. Idle jet is pretty much redundant past 1500 rpm.
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Old 15 November 2006, 17:58   #13
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It certainly seems to run fine after a certain throttle point. I was assuming idle jets because of this (and the fact it won't idle without choke). No idea of actual rev's but I'm guessing RIB is doing 4-5knts at the point it will actually run.
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Old 15 November 2006, 18:04   #14
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I think IBWET's air leak theory may hold some water
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Old 16 November 2006, 18:22   #15
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I think IBWET's air leak theory may hold some water
Yes possibly. If it's an air leak, 1st place to suspect is the gasket right? The gaskets are quite thick and pliable but it may be time they were replaced. I didn't replace them when I cleaned the carbs
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Old 17 November 2006, 00:10   #16
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Yes possibly. If it's an air leak, 1st place to suspect is the gasket right? The gaskets are quite thick and pliable but it may be time they were replaced. I didn't replace them when I cleaned the carbs
Fire it up and spray wd40 at anywhere you suspect of an air leak. If it's leaking the revs will rise when you spray in the right place.
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Old 17 November 2006, 17:16   #17
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Good idea! Boat is currently in my garage so I guess it'll have to wait until I tow it to somewhere with some water - don't fancy running it with muffs in my garage!
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Old 18 November 2006, 02:46   #18
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Fire it up and spray wd40 at anywhere you suspect of an air leak. If it's leaking the revs will rise when you spray in the right place.
Be very careful doing this as WD40 is flammable - I once fried a motorbike doing exactly this.
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Old 18 November 2006, 04:53   #19
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Be very careful doing this as WD40 is flammable - I once fried a motorbike doing exactly this.

It's safe enough as long as the carbs aren't spitting back-don't do it if they are. The coils and plug leads are far enough away from the carbs not to cause a problem. Use the tube on the wd40.
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Old 18 November 2006, 10:07   #20
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If its not the carbs check your fuel hose between the engine and the tank + the primer bulb, any split in that will suck in some air.
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