2002 mercury 40 hp 2 stroke

[chasenfish16]

I am having problems with this motor popping at idle, I completely rebuilt the carb with a OEM rebuild kit and cleaned out the water sediment bowl. Any suggestions would be appreciated.

 

[chasenfish16]

Re: 2002 mercury 40 hp 2 stroke

Someone has to have some ideas, any input would be greatly appreciated.

 

[sxmerc]

Re: 2002 mercury 40 hp 2 stroke

Is this the two cylinder 40 or the three cylinder 40. If it's the three, I'd say the carbs need to be syncronized correctly. If it's the two cylinder, you really need to have this motor backed down the ramp, or under way to adjust the carb. However, you could STILL be dealing with a dirty carb, or lousy fuel. Just cause' it LOOKED clean doesn't mean it was.

 

[chasenfish16]

Re: 2002 mercury 40 hp 2 stroke

It is a 2 cylinder. I was thinking fuel or carb also, the first time I pulled the carb off and cleaned it and it still did the same thing. So I pulled it off again and claened it again ( it really was not that dirty inside) and put a rebuild kit in it with all new gaskets and it still did it. I also have put a different tank on it with new gas. Is there anything else that could cause this? reeds, ignition or maybe fuel pump? I am pretty sure now it is not the carb.

 

[backyard mechanic]

Re: 2002 mercury 40 hp 2 stroke

Get a service manual and go through the link and sync on it. The carb may not be the issue; engines require a thorough timing set up to run correctly. It doesn't matter that it just came from a shop or factory or "some one just did it". As always, a compression test should start your procedure for diagnosis.

 

[sxmerc]

Re: 2002 mercury 40 hp 2 stroke

Yes, yes. By all means check your compression before getting too much more involved. Is this motor new to you? Was it running fine, and then suddenly this popping issue? Give a little info here first as to what led up to this issue. It'll make pointing you in the right direction alot easier.