2005 40 HP Yamaha will shake at idle

[cooperfly]

This motor is still new to me, I have noticed it will shake pretty good at times at idle. It starts great and runs good but at idle can literally shake the boat.

Any thoughts or ideas

 

[ClassicAQ]

My first idea is to know what model engine

 

[cooperfly]

40TLR - 2 stroke

 

[cooperfly]

Seems to shake more when I put it in gear, give it more gas and the shaking will go away.

I assume my carbs or jets could be gummed up - would sea foam help this

 

[Lund Rebel]

Seems to shake more when I put it in gear, give it more gas and the shaking will go away.

I assume my carbs or jets could be gummed up - would sea foam help this

I would check the RPMs. It might need adjusting. Sounds it set too low.

 

[cooperfly]

ok thanks, I do not have gauge for RPM. so would need to research how to check

 

[cooperfly]

would anyone use or recommend seafoam in the gas to help clean and maybe help rough idle

 

[johnnygjr]

Sounds like idle circuit needs looking into,The only way to free up possible gunk inside of carb. is remove carb. disassemble it then soak overnight,go threw all passages,jets,needle seat, etc. Then dry all passages with compressed filtered dry air. Have you tried a cylinder drop test at idle? Pulling one plug wire at a time, There should be a sound change and a rpm drop on a cylinder that's operating properly