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Old 02 August 2011, 16:06   #31
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sorry if this sounds daft, but do you use launching wheels? if so did you have them lifted up out of the water? friend of mine was worried about the performance of his 15 on his zodiac 340 when i pointed out that he had left the wheels down!
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Old 02 August 2011, 16:46   #32
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Yes....

but ..

Yes!!!
LOL!
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Old 02 August 2011, 17:53   #33
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Yeah, I've done this too...

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Old 02 August 2011, 18:32   #34
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Quote:
Originally Posted by willk View Post
Does the outboard rev like a slipping clutch on a car?
Now this is exactly what my engine just started doing (sorry for bringing it up in here but I was reading). It revs good and the engine sounds good, but I loose all speed when I come over 30-50% of the engine's capacity. And that's like, drop dead loose all speed.

It was working fine until I heard some kind of knock, and then this happened. And I didn't hit a rock...

I'm sorry to hear about these low speeds though! What engine is it? Perhaps there's some lock on it that restricts revving in neutral gear, and that now is coming on (faulty) even on forward? I found one of those on my engine, but I didn't have that problem. I just thought it could happen. Can you go as fast in reverse as forward? :o
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Old 03 August 2011, 16:29   #35
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...old 80s MarinerW15 Patrik... a simple affair... unlikely to have any deliberate override mechanism...not as fast in reverse (thankfully), but have wondered if there is anything else acting as a rev limiter at the tiller end. Will try taking off hood and on the water and see if I can increase throttle direct engine end?...
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Old 03 August 2011, 16:53   #36
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Always worth a try. Be careful if you're fingering inside the engine when it's on though, especially on the water... And don't run into anything Several reasons why people put the engines in a barrel

I have no idea how the mariner looks inside, but on the 70-80's evinrudes there's obviously some limiters of rev, for neutral and reverse. It's just like some pin or something that folds down when the gear switch isn't on forward. However, that was just a shot in the dark from me, I'm just a beginner myself.
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Old 03 August 2011, 17:24   #37
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Before looking to replace engine I would have it in somewhere that can put it on a Dynometer.

From your first post it sounds like where you had it serviced didn't do this or they would be able to confirm the actual power output.

If I remember correctly Sam Speed Marine at Wotton under Edge (not too far from you) have a Dyno. I'm not connected with them just a happy customer.

Mike
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Old 03 August 2011, 19:00   #38
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i too recon this an engine problem rather than boat trim a 15 hp should make this fly ,

could be something as simple as a faulty spark plug ,,even if they are new ones ,i had a similar problem with a brand new engine ,,10 hours running from new ,,would start up and run fine all day but when just about to get on the plane the power would drop and seemed like cylinder was down ,
i checked plugs good strong spark, correct gap as i keep the correct feeler gauge in the tool kit and both cylinders were running fine ,what i dident see at first was on one cylinder the tiny insulater ceramic tip at the spark end was broken and once the engine had about half power it would vibrate down the electrode and the spark was then shorting out up inside the plug,
when i reduced power the insulater vibrated back and it started sparking again ,,new plug and it had full power and up on the plane again.
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Old 06 August 2011, 18:10   #39
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Thanks all.... plugs are new... I was told by mechanic compression was good... will take back to nearest shop in Mallorca where its sitting right now...
:-)
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Old 06 August 2011, 18:42   #40
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Another thought - have you checked if the throttle cable is actually pulling the the throttle lever on the engine to the fully open position? - the adjustment might be off/slipped...
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