86 45HP MARINER

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BERRYESSA

Cadet
Joined
Apr 9, 2003
Messages
12
TROLLS PERFECT BUT WILL NOT RUN AT FULL THROTTLE.<br /> EVERY 15 SECONDS OR SO, AT FULL THROTTLE,, THE FOURTH CYLINDER KICKS<br />IN FOR A SECOND THEN BACK TO THREE CYLINDERS.<br />I CHANGED THE 4 PLUGS. NO IMPROVEMENT.<br /> IS THERE A HIGH SPEED JET? COULD IT BE PLUGGED? <br /> 99% OF THE TIME I TROLL. I HARDLY EVER, PROBABLY NEVER <br /> USE HIGH SPEED BUT IT WOULD BE NICE IF I NEEDED IT..
 
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donks

Recruit
Joined
Apr 7, 2003
Messages
2
Re: 86 45HP MARINER

I would look towards the coil on that cyl. Also what did your plugs look like? My guess would be that that cyl. was wet if it is a coil. Also check the compression. Bad rings or a blown head gasket would not pull the fuel to that cyl.
 
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BERRYESSA

Cadet
Joined
Apr 9, 2003
Messages
12
Re: 86 45HP MARINER

THANKS,<br /> PLUGS LOOKED GOOD. I'LL DO A COMP. TEST AND A PLUG FIRING TEST. HOW ABOUT I TRY A CAN OF CARB. CLEANER IN THE GAS?
 
2

25xs Mercury

Cadet
Joined
Mar 16, 2003
Messages
7
Re: 86 45HP MARINER

adding carb cleaner to boat gas...? Not a good idea.<br /><br />Gasoline & oil mixed properly is plenty flammable to run your motor. If the carb was bad, "both top cylinders" would be acting up, not just one of them.<br /><br />Suspect the coil or top main seal like the others are suggesting.
 
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BERRYESSA

Cadet
Joined
Apr 9, 2003
Messages
12
Re: 86 45HP MARINER

THANKS 326. NO CARB CLEANER. I CAN CHECK COMP. OK BUT NO IDEA HOW TO CHECK THE COIL AND MAIN SEAL. MAYBE I BETTER LEAVE WELL ENOUGH ALONE<br />AS IT TROLLS SMOOTH ALL DAY. IE: IT'S ONLY HALF BROKE SO MAYBE I BETTER NOT FIX IT.
 
rickdb1boat

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: 86 45HP MARINER

Check for fire on the suspect cylinder first. If it's dead, swap a good coil from another cylinder and see if it fires.
 
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BERRYESSA

Cadet
Joined
Apr 9, 2003
Messages
12
Re: 86 45HP MARINER

MARINER 86 4 CYL. 45 HP,<br /> BOTH VOLT METERS ON MY BOAT READ UP TO 15.9--16 VOLTS AT 3/4 THROTTLE AND 13--14V<br /> AT TROLL SPEED.<br />ISN'T THIS WAY TO HIGH. I HEARD 13--14V WAS ALL IT SHOULD EVER READ.<br /> BAD ALTANATER,-- BAD REGULATER?? WHERE DO I START?
 
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