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90 hp 2002 Rough idle yesterday and when oped up it falls flat on its face at top speed. Changed plugs last night and this morning started fine run fine until we hit top speed and died again but never did it but once. It kinda has some sound to it though. Whats ya'lls thought?
anybody
http://www.themarinedoctor.com/cgi-bin//YaBB.pl I've got alot of help on the site.Maybe thye will help you....
It might not apply to your's, but I had a pickup tube that was split up the side. It would idle around fine, but on WOT the gas level would drop below the start of the split and suck air. That's all I got. LOL Try iboats forums too, there's some good guys on there.
well if it has been a while since you had it out last your high speed jet in the carburators are plugged up.
or one i had the vent line on the gas tank suck closed
but most likely the carburator high speed jet just pull it out and spray it with carb cleaner till it is open put it back.
ive run it all winter
My bulb needs pumping up by the time i get home, is that normal?
Try the Web Site Bass Boat Central: They have a Mercury Forum there and Several Mercury Mechanics Monitor and respond to Questions. They are some of the best most knowledgable people I have seen. Your problem doesn't seem too bad, I'll bet they can answer you problem pretty quick.
THE BANDIT
Thanks
nope. start with checking all your fuel lines and then move on to the fuel pump. i think your sucking air, but not enough til their is a greater demand for fuelQuote:
Originally Posted by DTG
I agree with stinkies daddy, my pontoon has been doing something similar to what you are describing & it's getting air somewhere, as long as you are pumping it, it runs fine, but you stop & it dies, could be the carb jet too, I've experienced that, if it turns out to be the carb, I put a can of Seafoam in my gas & it will help it clear out.Quote:
Originally Posted by DTG
But I would say you are getting air in the lines somewhere, just my opinion :D
We tried pumping bulb and it was tight at wot.
Found my problem. Piston 1 fair, 2 trashed ,3 trashed= new short block-$2700 Mechanic said it could have been from trimming motor to high and sucking air. Motor is set to high on boat so dropping it.
what would trimming your motor to high have to do with trashed cylinders unless it was way overrevved ?
just asking info is always a good thing !
trimmed high sucking air, sounds like over heating, not getting enough water to keep cool = burned out engine.Quote:
Originally Posted by scoremaster
DTG, another thing that could have caused your problem is the fuel pump. If your's is the square shaped one. If your motor falls into this range make darn sure it gets rebuilt with the new style check valves or else you will have the same problem with a new block.
The new plastic check valve started in production at the serial numbers listed below.
MERCURY/MARINER USA Belgium
200 - 250 HP, 3.0 Litre Carb/EFI/Optimax S/N 0G925400
135 - 200 HP, 2.0/2.5 Litre Carb/EFI/Optimax S/N 0G912213
75 - 125 HP, 65 Jet S/N 0G923899 S/N 0P054758
40 - 60 HP S/N 0G919929 S/N 0P054357
30 - 40 HP S/N 0G919618 S/N 0P054357
This info comes from a Merc TSB
Yea but you think my overheat alarms would have went off. They work cause we tried them. The motor run fine the day before we took it in. Never had a problem much out of it. Run and pee'd like a champ.
IBfishn- I'll check but i bet comming from Mercury they'll send the good stuff. He's gonna go through it and clean it all and check everything so maybe we'll be good.
Their are several possible causes for the scorched pistons. If your engine is not overreving I would suspect that you are not pulling the water intakes out of the water. Mercury waterpump impellers are pretty bad about not lasting long. My XR6 gets the impeller changed every year. The wings on the impeller are pretty short and can wear down very quickly, the newer models have longer wings and tend to last a bit longer. Next time that you take your boat out, get it on plane and trim it out. Watch your water pressure gauge and if it is sucking air it will drop down to nearly nothing. If the pressure stays high, then you may have had other problems; ie: low oil levels, reeds may have chipped, bad water pump, plugged water intakes, or just about any number of things.
Just took my motor back to the dealer. Been having alarm issues since I bought it last year. The other night I was coming in wide open, the alarm went off and it slowed right down. This is a 30hp 4 stroke. It was smoking, I thought it was on fire. Dealer suspects it's blown. Still under warranty. Should I accept rebuilt? New power head? Or get a lawyer?
x2Quote:
nope. start with checking all your fuel lines and then move on to the fuel pump. i think your sucking air, but not enough til their is a greater demand for fuel
I would hope that DTG has got this fixed by now. This is a 4 year old thread.