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Motor fires but stops when starter disengages, it fires when

Customer Question
motor fires but stops when...
motor fires but stops when starter disengages
JA: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.
Customer: it fires when u turn the switch,, but wont run
JA: Is there anything else the Marine Mechanic should be aware of?
Customer: not as far as i know,,new gas .new fuel filter,,new pump bulb
Submitted: 1 year ago.Category: Boat
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Answered in 2 minutes by:
8/20/2016
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,293
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified

Hello my name is ***** ***** am I speaking with?

I don't see any kind of year or model information, what are you working on?

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Customer reply replied 1 year ago
2003 mercury 25 hp outboard
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

All Mercurys are cataloged by serial number, do you happen to have that number handy? If not, is this just a basic twin cylinder single carb 2 stroke model?

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Customer reply replied 1 year ago
0t739974
Customer reply replied 1 year ago
mix oil with gas
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Got it.

Pull the key switch out and disconnect the black with a yellow stripe wire and let me know if it starts or does the same thing. If it does start, make sure you have water hooked up to the engine because you won't be able to shut it off until you reconnect that black/yellow wire. Also, there will be voltage on it so don't touch any bare wire.

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Customer reply replied 1 year ago
ok
Customer reply replied 1 year ago
did same thing
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

What is the history on this engine, when did it last start and run correctly? How old is the fuel itself?

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Customer reply replied 1 year ago
last november< new fuel,,new gas line,,new filter,,new battery
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Do you have any starting fluid so we can see if the engine will stay running longer on that?

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Customer reply replied 1 year ago
tried that ,,does same
Customer reply replied 1 year ago
may run a few seconds longer,
Customer reply replied 1 year ago
its like the starter kicks out to soon
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

This is going to be a process of elimination. The compression and spark output need to be tested with a compression gauge and a timing light. Is that something you can do?

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Customer reply replied 1 year ago
dont know,, if the auto parts atore has thim i can borrow thim
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

We need to see what the engine has for compression, and then see if it's output spark on both cylinders or not. This will get us pointed in the right direction. The starter is not the issue, the engine can be rope started if necessary (and if it was running correctly). Let me know how you make out with the compression and spark testing.

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Customer reply replied 1 year ago
i used to rebuild motors in cars,,so i can use the tools
Marine Mechanic: Jason, Marine Mechanic replied 1 year ago

Sounds good, let me know how you make out.

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Dominick
Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1,009
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Experience: 25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

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