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Got a mercury 40 outboard motor i have 120 psi compression

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all four cylinders have spark...
got a mercury 40 outboard motor i have 120 psi compression all four cylinders have spark and fuel acts the the timing is off checked fly wheel key its ok any ideas
Submitted: 2 years ago.Category: Boat
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7/22/2015
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,418
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hello my name is ***** ***** am I speaking with? What makes you think the engine has a timing problem? What exactly is it doing?Also, can I get the serial number on the engine please.
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Customer reply replied 2 years ago
my name is ***** ***** engine has spark compression and fuel when trying to start it will just turn over every once in a while it will kick
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Hi Sandy.Have you tried any starter fluid down the carbs?Do you have a timing light to check timing?
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Customer reply replied 2 years ago
i tried starter fluid both carb and cylinders no on timing light
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Pull all the spark plugs out. Stick a screwdriver down the top plug hole. Turn the flywheel slowly by hand until you can feel the piston come up to the very top of its' stroke. When it's at the top. Is the 0 mark on the flywheel lined up with the timing tab?
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Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Is that something you can do now?
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Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Also, how did you check for spark exactly, there are right ways and wrong ways to do it.
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Customer reply replied 2 years ago
0g224602 serial number timing mark is on 0 with piston up
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
how did you check for spark exactly, there are right ways and wrong ways to do it.
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Customer reply replied 2 years ago
took all plugs out put plug on side of engine all four sparked
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Got it. That is not the correct way to check for spark. To properly check it you need a spark tester set to 7/16ths on an inch, and the spark needs to jump that gap. Click this link below to get to a youtube video. This explains how to check for spark. Fast forward to the 3 minute mark. https://www.youtube.com/watch?v=eSmNMWTDtZE
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Customer reply replied 2 years ago
used a spark testor forgot i had and all still have good spark
Customer reply replied 2 years ago
any other ideas
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,042
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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Hello, my name is ***** ***** you still need assistance with the engine?
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Customer reply replied 2 years ago
yes i do
Customer reply replied 2 years ago
i have spark compression and fuel but the engine will not run
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Check the fuel for water. I think that I saw where it is new, but you can still buy water at a gas station.
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Customer reply replied 2 years ago
i sprayed starter fluid in the spark plug holes still will no trun
Customer reply replied 2 years ago
acts like it is firing at wrong time just poofs once in awhile
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Do you have a multimeter?
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Customer reply replied 2 years ago
yes i do what should i test?
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Take out the plugs, measure the resistance from the cap to the threads. Then from the cap to the center electrode. hat do you get?
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Customer reply replied 2 years ago
0.00
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
From where to where?
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Customer reply replied 2 years ago
cap to electrode
Customer reply replied 2 years ago
there are new plugs
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Still have the old ones?What plug do you have?
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Customer reply replied 2 years ago
no
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Was that on both plugs?Which plug do you have?
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Customer reply replied 2 years ago
this is a four cylinder alll new plugs new gas they all fire 120 psi compression im stumped
Marine Mechanic: Charles, Marine Mechanic replied 2 years ago
Does the meter have a max or a hold button?
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