Knock like sound from engine

[ViktorioH]

There is a sound look video

 

[beastlywarrior228]

Could be the video but I'm not hearing any knocking.

 

[ViktorioH]

Could be the video but I'm not hearing any knocking.

Hi thanks for replying, but when I got it it used to be more silent there . Now it is louder than the exhaust

 

[ViktorioH]

Could be the video but I'm not hearing any knocking.

And it sounded better before now it knocks

 

[YamahaNutz]

Easy quick way to check is to take a steel tube, around 1/2" to 1-1/2"(if you have something laying around) and touch it to the motor in different areas. You hold it to your ear and listen to where it's the loudest. O'Reilly has a fairly cheap tool for this that is a stethoscope with a rod attached to it. You can pinpoint where the sound is coming from.

Could be a ton of different things. Try to use a tube or stethoscope tool and just touch it around different areas and find where it is the loudest.

Have you checked the valve lash recently? These motors are known to have some sewing machine like noises.

 

[PineyPower]

A screwdriver makes a good stethoscope too.

 

[ViktorioH]

Easy quick way to check is to take a steel tube, around 1/2" to 1-1/2"(if you have something laying around) and touch it to the motor in different areas. You hold it to your ear and listen to where it's the loudest. O'Reilly has a fairly cheap tool for this that is a stethoscope with a rod attached to it. You can pinpoint where the sound is coming from.

Could be a ton of different things. Try to use a tube or stethoscope tool and just touch it around different areas and find where it is the loudest.

Have you checked the valve lash recently? These motors are known to have some sewing machine like noises.

Hi it is coming from under the cylinder/ around that area

 

[YamahaNutz]

Valvetrain noise can transfer through the chain to the lower end. Lower left side more noisy?

 

[Altabell]

What year are you working with my early quad has always sounded similar

 

[ViktorioH]

What year are you working with my early quad has always sounded similar

2006 raptor 350

 

[ViktorioH]

Valvetrain noise can transfer through the chain to the lower end. Lower left side more noisy?

No more in the middle

 

[YamahaNutz]

You can probably take the plug out, and get the piston near top dead center. Now grab a wrench on the stator side bolt and rotate it back and forth slowly. If it clicks or knocks, you might have a worn rod bearing(top, bottom, or both). If you take the camshaft cover off, you can check for excessive slack in the camshaft chain, too.