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ContinuousWave: Whaler Performance
Puzzle for me!!!
|Author||Topic: Puzzle for me!!!|
posted 08-07-2003 08:05 PM ET (US)
Situation..Bottom line..18' Outrage..85 90hp Evinrude..Rebuilt in 2001..Was running fine..Kicking butt at 5000rpm..No more..On the water now it works well at 1700rpm (6mph)..Goes to 5000rpm in neutral...Throttle forward and it will go to 2000rpm (7.6mph)...Bring it home, in driveway in neutral it will go to 5-6-7K..In gear the same 5-6-7K..Mechanic will get the motor, but was just wondering..Can't catch fish in the driveway????
|Jamie 20 outrage||
posted 08-07-2003 08:14 PM ET (US)
Not enough info to do much more than guess. If you give more info... Was it running rough, does it make funny noises, have you had any other symptoms, have you had water in the fuel, any other repairs recewntly, etc.
posted 08-07-2003 09:27 PM ET (US)
Was going to add input according to questions..My bad..Gas tank sealed at intake due to leakage at pickup..Corrected I think..Ran motor on above deck tank with same throttling problem..Gas bulb fills and then weakens..My concern is with the 63 gal. tank..Could a warned 85 tank have a leak that could reduce compression..If yes, why would I have the same effects with an above deck tank..All hoses and connections are new???
posted 08-07-2003 10:35 PM ET (US)
I would not run the motor over 1500 RPM on a pair of muffs for any length of time.
It seem clear that the motor is not producing its rated horsepower. That is why it can spin the prop in the driveway, but can't develop enough torque to spin it in the water when pushing the boat.
Maybe a dead cylinder? Pull off a spark plug wire and see what happens. Try all three individually.
posted 08-08-2003 08:31 AM ET (US)
This is exactly why you have to be careful buying used outboards. I see guys over rev their outboards at the ramp everytime I go out.
Watch the muffs when you reach about 2000 RPM and your'll see them start to suck in.
Without a load, in the water in gear, you can and will do severe damage.
Your lucky the engine runs at all after that.
posted 08-08-2003 11:45 AM ET (US)
NEVER rev an engine in neutral over say 2500.
posted 08-08-2003 02:25 PM ET (US)
Sounds to me like a fuel delivery problem. An unloaded engine will perform drastically different from a loaded engine. Since you stated that the motor performed the same with an external tank, I am guessing you have a fuel restriction somewhere. When did you last change the fuel filters? Try bypassing them if changed recently. When did you last clean the carbs? Do you get better performance (in the water) if you partially apply the choke (about 1/2 closed)? Try squeezing the primer bulb while running. If performance improves, check the fuel pump.
Good luck with it!
posted 08-09-2003 09:12 AM ET (US)
I would recommend a compression test and a "leak down test". If a cyl fails either pull head and inspect for cause. If all is well with both tests, then chase other potential causes... fuel/ignition... happy Whalin'.. Clark... Spruce Creek Navy
posted 08-09-2003 03:48 PM ET (US)
Thanks for the heads up..I have by-passed the fuel/water separator..I have primed the bulb while running..Could be bad gas???..This same gas runs my 9.9 kicker fine...With this same gas, I have hit 29 mph at 5000rpm on the 90hp..Was running good..Then was running good in spurts..Now running at about 8mph at full throttle in the water...Have used external tank by-passing fuel/water separator..Fuel water separator had very little water in it, but gas looked bad...Bulb just will not stay full as engine will not draw enough gas..Will have carbs checked and have a compresion check..Engine rebuilt in 2001...I purchased in 2002...Sometimes the bear gets you!!!
posted 08-11-2003 02:38 PM ET (US)
check ignition components could be a power pack
posted 08-11-2003 03:01 PM ET (US)
I have a Merc 150 EFI on my 18 that wouldn't go above 3,000 in gear. Found there was a small in-line filter with a screen that had a bunch of gunk in it - enough to reduce fuel flow at higher loads. Cleaned it out with an old toothbrush and a small amount of gas and all was well.
I don't remember exactly where it was (under the cowl) but I remeber finding its location from a shop manual. The mechanic had said he had cheched "all filters" but had missed this one.
posted 08-12-2003 11:31 AM ET (US)
Maybe you have spun the hub on your prop.....
posted 08-13-2003 01:29 PM ET (US)
Goodad, you mentioned that the bulb will not stay full...Do you mean that it is collasping when trying to run at higher speeds, while under load? In other words, does it look like the bulb is under a vacuum? This would mean that the engine is trying to suck in more gas than the fuel line will allow. Check for a clogged filter or even a clogged line before the primer bulb. I've also seen this happen numorous times with portable tanks when the tank vent is closed...except the tank itself collapses!
As for the "bad gas" comment...run your external tank with good gas!
Plotman had exactly the problem I was talking about. I've experienced this problem on almost every carburated motor that I've owned. I still think you have a fuel restriction...
posted 08-13-2003 05:05 PM ET (US)
It's in the shop now..Each time out I get about 5 mins. of running time before it bogs down...Planes nice and everything..Then will only go to about 2000 rpm wot...Ran on fresh tank after checking all filters (I think) My mechanics thinking coils..He will check compression etc..I trust his capabilities...I now have him as frustrated as I am???...He is taking this personal, which is good!!! Will respond once the puzzle is solve.Appreciate the responses which I have shared with my mechanic..Thanks...Bill
posted 08-14-2003 01:20 PM ET (US)
My boat went in to the shop twice without getting fixed when I had the problem I mentioned above - to the tune of $300 - before I said F-this and bought the shop manual and found the problem myself.
Have you checked all the filter(s) under the cowling? These are not obvious, and I needed a shop manual to know it was the problem. Once I identified that it was indeed a filter, it was a 5 minute fix.
posted 08-14-2003 02:31 PM ET (US)
goodad, figuratively speakin', you've gots you a fine Corvette of a hull with a VW Beetle motor in the present set-up. That will remain somethin' of a problem, in mah opinion, until you re-power with a 150 h.p. engine. Trust ole hoot on this. Even a used 150 will give you a completely different and better experience o'that classic boat. Ah say sell the 90 to some gear-head for parts, and upsize your back-side. Could be that's what your boat is tryin' t'tell you with her latest behavior. Listen to that sweety and make her happy. You won't regret it:-!
posted 08-29-2003 02:42 PM ET (US)
Finally have it running good...Cause (at least this time) ended up being coils (four) and switch boxes (two)..Compression good in all cylinders...Sucking gas good now that it's $1.70/gal. Thanks for all the responses..Will repower soon, but hopefully not this year....Thanks...Bill
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