40 Hp Mercury Carb

[Rollercoaster]

1993 40 hp mercury botton carb not suckng in air. Engine run on top cylinders. All plugs firing. Bottom carb has fuel in bowl.

 

[Dave1027]

Re: 40 Hp Mercury Carb

Do a compression test.

 

[Rollercoaster]

Re: 40 Hp Mercury Carb

Compression test good on all 4 cylinders.
Have spark on all four cylinders.

 

[Dave1027]

Re: 40 Hp Mercury Carb

Possible intake manifold leak or something clogging reed block.

 

[Rollercoaster]

Re: 40 Hp Mercury Carb

Possible intake manifold leak or something clogging reed block.

Is it hard to get to reed block?

 

[Rollercoaster]

Re: 40 Hp Mercury Carb

Is it hard to get to reed block?

Would reed block affect only only one carb?

 

[Dave1027]

Re: 40 Hp Mercury Carb

I'm not specifically familiar with your engine but I'm pretty sure each carb has it's own reed block.