40HP 2cyl Merc ser.#3121898

[1I Willie]

Last year I had the Stator & coil replaced because of no fire. This year am having starting problems, and running at idle. I changed the plugs NGK BUHW-2, are these the correct plugs? If they are what should my next step be? I was thinking that the carb needs some work, if any-body has some suggestions I would sure appreciate it. Thanks

 

[AMD Rules]

Re: 40HP 2cyl Merc ser.#3121898

That motor came with AC V40FFM plugs. Merc recommended AC M40FF for motors "that were 'rough running', or experienced engine cutout at low speeds."

I suspect the Champion L76V or NGK BUHW would be appropriate, and the NGK site suggests BUHW plugs.

 

[1I Willie]

Re: 40HP 2cyl Merc ser.#3121898

Thanks for the information on the plugs. I have another question, I want to clean the carburator out, is there a way to flush it out without taking it off the motor, and not completely disassembuling the carburator ?

 

[AMD Rules]

Re: 40HP 2cyl Merc ser.#3121898

Only way to clean a carb is to dismantle it and blow out all orifices etc.

To keep a clean carb clean, you can periodically run some products such as Mercury Powertune, gas additives, or Seafoam etc through the carbs in the fuel system.

 

[1I Willie]

Re: 40HP 2cyl Merc ser.#3121898

Is there anybody out there that can tell me how to bench test a coil? Can any body tell me how to trouble shoot the ignition system?