20hp merc help please

[sprogg&fin]

I have a 20hp merc , approx a 91 and it will cough (like a cold) puff out a shot of smoke bog for second then resume running normal then repeats....any ideas would be very helpful...thank you

 

[sprogg&fin]

Re: 20hp merc help please

Just wanted to add, that I think its a 86 not a 91....and thanks to anyone that can help....trying to get my kids out on the water

 

[latin monkey]

Re: 20hp merc help please

have you taken the carb off and cleaned it?

 

[sprogg&fin]

Re: 20hp merc help please

I am just about to do it again today incase I missed something...thanks for the reply , hoping I missed something and find it.

 

[Wingedwheel]

Re: 20hp merc help please

Check your float adjustment. Do you have a factory manual?

 

[Mi duckdown]

Re: 20hp merc help please

If you are going to remove the carb rebuild them. why go thru all that and not rebuild it. plus the pump. Like 50 bucks.
although what you describe is usually a timeming problem.
Also make sure your tank and lines to the motor are free of water.

 

[sxmerc]

Re: 20hp merc help please

Sounds like it's running a bit lean. As Latin Monkey said, take off carb and clean. Set idle mixture screw to 1 1/4 turns out and see what happens from there.

 

[sprogg&fin]

Re: 20hp merc help please

thanks to all who replied..I pulled the carb again , its like new so I cleaned it anyways again , also found that it was too lean and had to back out a bit to get it where I wanted....now I want to get it on the water so I can make sure that was the problem for sure. Thank you all for the advice , hope my next run is a success. If not I will work on the timing

 

[Mi duckdown]

Re: 20hp merc help please

I know we will hear from you again.
But don't start another thread