Mariner 150 - hard to cold start and stalls on low revs

G

Gnirts

Cadet
Joined
Aug 3, 2004
Messages
8
Hi,<br /><br />We've recently got a Mariner 150 engine approx 10 years old and it doesnt seem to like cold starting very well. To get the engine ticking over without stalling it requires nearly full hand throttle.<br /><br />In addition to this, when on very low revs for slow speed it has a habit of occasionally stalling requiring a restart, again with the hand throttle raised to get it going.<br /><br />Can anyone post a trouble shooting guide or some advice on what to look at to identify the problem ?<br /><br />Thanks
 
K

Keith Buchanan

Petty Officer 1st Class
Joined
May 10, 2004
Messages
221
Re: Mariner 150 - hard to cold start and stalls on low revs

First thing to do is a simple compression test. If they are close on all pots new spark plugs and high tension leads are the order of the day. Plugs and leads are 90% of the problem in my experience. Either you will have cured your problem or you will have eliminated a whole bunch and post back for further tips..<br /><br />Good luck Keith B... keep it simple.
 
G

Gnirts

Cadet
Joined
Aug 3, 2004
Messages
8
Re: Mariner 150 - hard to cold start and stalls on low revs

OK. Spark plugs will be changed tomorrow when they arrive so at least we can eliminate that. Will post back in a few days when i get back if it hasnt cured it.<br /><br />Thanks for the reply.
 
K

KCLOST

Commander
Joined
Jun 22, 2002
Messages
2,095
Re: Mariner 150 - hard to cold start and stalls on low revs

If you have to advance the throttle that much to get it or keep it running, it sounds more like a fuel issue....<br /><br />Go ahead and replace the plugs, but it may be time for a carb rebuild.... May be your low speed jets clogged up...<br /><br />Are you priming the bulb prior to starting it cold?
 
G

Gnirts

Cadet
Joined
Aug 3, 2004
Messages
8
Re: Mariner 150 - hard to cold start and stalls on low revs

Yep bulb is primed and hard before starting attempts.<br /><br />I noticed the fuel filter looks to be 90% full of rubbish - could this be affecting the starting or isnt it a problem?
 
K

KCLOST

Commander
Joined
Jun 22, 2002
Messages
2,095
Re: Mariner 150 - hard to cold start and stalls on low revs

Yes, the filter can restrict fuel flow....<br />replace it and retest...
 
dingbat

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
15,498
Re: Mariner 150 - hard to cold start and stalls on low revs

With a motor that age it's time to change out the fuel pump diaphragm also. Low fuel pressure could be a reason why it runs OK when you open up the throttle a little ways
 
G

Gnirts

Cadet
Joined
Aug 3, 2004
Messages
8
Re: Mariner 150 - hard to cold start and stalls on low revs

We think its about 10 years old but cant find a serial number on there to attempt to ID the year.<br /><br />All thats written on the top of the engine block is "V150" and on the actual cylinder: 87976AS / 3400<br /><br />On the starter motor area, 50-7714?? 10 3 90<br /><br /><br />Changed the spark plugs today and cleared the fuel filter and it seems to start better, no hand throttle needed and generally idles OK but dropped out once or twice.
 
R

ronmold

Petty Officer 1st Class
Joined
Sep 8, 2003
Messages
240
Re: Mariner 150 - hard to cold start and stalls on low revs

serial # should be on the tilt/swivel bracket, starboard side
 
G

Gnirts

Cadet
Joined
Aug 3, 2004
Messages
8
Re: Mariner 150 - hard to cold start and stalls on low revs

OK the serial number reads:<br /><br />0D056850<br /><br />Ive looked on http://www.marinshopen.se/ and think it might be a 1991 V150 or V150 Magnum 2. Is this correct? If its the right year i'll order a maintenance manual for it.
 
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