My friend has a mercuriser 140, difficult to start

[SankorLiu]

Is it easy to fix?
Does Carbs has issue

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Thank you

 

[dubs283]

Is it easy to fix?

Yes, those engines are quite simple in their operation.

First suggestion for difficult starting other than following the correct procedures for starting a marine engine would be a tune up

 

[SankorLiu]

Yes, those engines are quite simple in their operation.

First suggestion for difficult starting other than following the correct procedures for starting a marine engine would be a tune up

Can we DIY to tune up? Also How can I find the manual according to the engine serial No?

 

[dubs283]

Can we DIY to tune up?

Of course

You can DIY anything. Just requires knowledge, skills, tools, materials and patience

 

[440roadrunner]

The basics. Been the same essentially since the days of the Model T
compression, fuel and spark

1....Compression. Engine must have adequate compression, AKA not worn out, timing (cam drive) not "slipped" nor cylinders washed down with fuel or dry from extended storage. Run a compression / leak down check
2....Fuel. Enough, but not too much, and FRESH. NEVER assume that "what is in the tank" is going to run. Check plugs are they dry, wet?
3...Spark. Good hot spark and in proper time. If possible, check with a WIRE solid core coil wire and a test gapl Cranking with a good battery, should result in a nice hot blue spark "in rhythum" at least 3/8" and typically more like 1/2"

Modern fuel sucks and can cause vapor lock/ fuel boiling problems in carbureted cars, likely "not so much" boats as the engine bay is many times much cooler.

 

[achris]

Perform a standard tune up exactly like you would on a car engine (because, that's pretty much what you're dealing with)...

Check compressions, change spark plugs, cap, rotor, points, capacitor, adjust timing, then start working on the fuel system.

Chris....