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Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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I have a 40 hp 2 stroke outboard yamaha not firing on one

Customer Question

hi I have a 40 hp 2 stroke outboard yamaha not firing on one cyl changed plug no good clean fuel new water seperator
JA: Sometimes boat issues seem like they'll be really complicated, but 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: boat idle through winter, changed fuel and water seperator it made a few attempts to rev out fully but only for a few seconds took off spark plug leads one by one and found one not making any difference to tick over changed plug no difference
JA: Is there anything else important you think the Marine Mechanic should know?
Customer: dont think so
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Marine Mechanic about your situation and then connect you two.
Submitted: 4 months ago.
Category: Boat
Expert:  Jason replied 4 months ago.

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

What is the model number on the engine?

Has engine compression and spark output been checked yet?

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