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Hello my name is ***** ***** I will assist you. Normally from what you are describing it looks like the leads going to the spark plugs may have been swapped and thus firing when not supposed to fire creating the backfire.
Check these leads to be going to the corresponding spark plug and let me know.
Ok then if the firing order is next thing to check is theair and fuel pressure. Did you check this? Air pressure should be between 88 and 101 psi whilst fuel should be between 97 to 113 psi. Also make sure the compressor belt is not loose.
Ok then i am out of ideas so i will opt out maybe someone else can help you.
Good morning, my name is***** am another expert here.
I read everything that has been written so far. What can you tell me about the engine? When did it last start? Did it break down when out on the water, or was it working fine on a Monday and then decided not to start on a Tuesday? How old is the fuel itself?
Has this engine started since the piston rings were installed?
I hate to ask but are you absolutely positive the pistons are installed in the correct position, and not backwards?
Hmmm... The Tohatsu factory service manual would indicate otherwise, and that the pistons can be installed in either direction. Were you working with a factory service manual when you installed the pistons?