MERC WONT PERK

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hd9linesman

Cadet
Joined
Dec 9, 2005
Messages
8
I just bought a 1975 115 merc with power trim,serial no 4238162, on ebay. it has a new cdi wiring harness new plugs. the seller claims it has been serviced and runs very well, with comp at approx 140.<br />well comp is 120, i have good spark at the plugs good comp but gas seems not to make it from the carbs to the cylinders. if i give the cylinders a squirt of starting fluid it will fire. gas leaks from all carbs rather than going into intake. <br />Im stumped.<br /> hd9linesman
 
N

north40

Petty Officer 1st Class
Joined
Apr 13, 2004
Messages
331
Re: MERC WONT PERK

I would say disassemble and clean or do a rebuild on carbs for starters.
 
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hd9linesman

Cadet
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Dec 9, 2005
Messages
8
Re: MERC WONT PERK

thank you, ive been browsing the forum pages looking for answers and i found one that mentions a primer valve. <br /> i have a push button choke ,butterflies seem to work properly, could there be a similar valve not allowing gas to pass through carbs??
 
H

hd9linesman

Cadet
Joined
Dec 9, 2005
Messages
8
Re: MERC WONT PERK

also , this engine is VERY clean, it was shipped from missori to cal . showed up without a speck of grime or dust for that matter
 
T

TxShorty

Petty Officer 3rd Class
Joined
Oct 28, 2005
Messages
84
Re: MERC WONT PERK

Motors would have either a primer or choke, but not both. Newer inline 115s idled on the top two and had an accelerator pump injecting 3 and 4 on take-off...
 
L

lark2004

Lieutenant Junior Grade
Joined
Jul 12, 2004
Messages
1,080
Re: MERC WONT PERK

Even though the engine has been cleaned externaly, the internal passages of the carbs could be full of muck. I'd rebuild them.<br /><br />P.S. don't use starter fluid in an outboard, it has no lubricant and can damage the engine. Use some pre-mix fuel/oil in a spray bottle and squirt that into the throats of the carbs
 
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inlineal

Seaman Apprentice
Joined
Sep 19, 2005
Messages
46
Re: MERC WONT PERK

A 1975 inline 115 6 cyl needs all the help it can get while starting cold...Yes it needs an inline primer bulb between the fuel tank and fuel pump...Plus a good working choke...You have to prime the carbs almost to the flood stage to fire them off cold...And a battery in good condition These have to really spin to get started...The later model 4 cyl 115 runs on two then four...
 
H

hd9linesman

Cadet
Joined
Dec 9, 2005
Messages
8
Re: MERC WONT PERK

thanx for all the info,,, are you saying its normal for the carbs to leak when starting cold , and for the first time in "supposedly months".
 
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inlineal

Seaman Apprentice
Joined
Sep 19, 2005
Messages
46
Re: MERC WONT PERK

It would be Ok if there was a small amount of leakage of fuel at first..Sometimes it takes a bit to seat the needles..If there is a flooding condition afterwards the carbs need the latest updated kits with alcohol resistant parts...
 
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hd9linesman

Cadet
Joined
Dec 9, 2005
Messages
8
Re: MERC WONT PERK

Want to let you all know that from reading all the posts the last few dayz, i decided before i dropped the carbs I drained my tank sucked bout a ggallon or so of premium from my harley tank , mixrd it with a little oil, and KAPOW,KAPOW. just like that im checking the tides.cant wait till saturday. MUCHO TY hd9linesman
 
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