Mariner/Merc 50hp outboard will only full throttle in neutral

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pompeymatt

Cadet
Joined
Oct 24, 2010
Messages
10
Hi, new to this site. i have a 50hp mariner 1990s) which i put on the water today, it has had new impella, new starter motor, compression 160 on every cylinder, everything all sound..

However run it today for some reason wont full throttle, i put it in neutral and lift the choke up(merc controls) electric choke) and it revs lovely and sounds powerfull, but when i put it in gear i feel i am only getting half power when im giving it full throttle....

after over 1000 spent on the engine i just need the thing to peform.

could someone please please shed some light..

thanks in advance
Matt
 
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etech2008

Seaman Apprentice
Joined
Jul 4, 2010
Messages
36
Re: Mariner/Merc 50hp outboard will only full throttle in neutral

sounds like you need to go through carburation real common good luck!!!
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: Mariner/Merc 50hp outboard will only full throttle in neutral

Check your basics....spark,compression and fuel. Since you have alreadycheck compression check spark as it may not be firing on all cylinders...
 
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pompeymatt

Cadet
Joined
Oct 24, 2010
Messages
10
Re: Mariner/Merc 50hp outboard will only full throttle in neutral

faz spot on.

outboard engineer said it wasnt fireing on bottom cylinder due to a dodgy spark plug

thanks again
 
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pompeymatt

Cadet
Joined
Oct 24, 2010
Messages
10
Re: Mariner/Merc 50hp outboard will only full throttle in neutral

morning all, changed spark plugs and still having same problem!!!!!!

any suggestions?
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,616
Re: Mariner/Merc 50hp outboard will only full throttle in neutral

Sounds like a faulty switchbox....is a 3 or 4 cylinder so I can post you a link to troubleshoot it?
 
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