Mercury Thunderbolt 20HP (blueband) 1987

[Yabba=Dabba-Doo]

Can anyone help me?
My engine can only idle at high revs otherwise it dies, also when I accelerate past half way it dies again. Someone has said it could be that one of the plugs is not sparking but they are new plugs?

 

[Laddies]

Re: Mercury Thunderbolt 20HP (blueband) 1987

Use a spark gap and check for spark on both cyls. but it sounds like you need to clean the carb.

 

[Yabba=Dabba-Doo]

Re: Mercury Thunderbolt 20HP (blueband) 1987

I assume a 'spark gap' is a tool, I'll give this a go - thanks.