100$ Dation 16HP MTD 990 "Mud Train"

sending it means not to care about it & run it til death

check the valve guides fist, before buying new rings

It's not valve related. When it was run low on oil for hours it probably wore the cylinder and it now has a little bit of piston slap, causing the knock. That's what the knock sounds like to me anyways.

This would also be why it's burning oil, because the cylinder is worn.

@SebastianAlbrecht wrote:

sending it means not to care about it & run it til death

check the valve guides fist, before buying new rings

it cant be valves, the knock happens every rotation.

also... how do i tune the main jet on a fully adjustable carb? is there better way then feeling for bog on just dumping the go lever/cluch all the way?

@RockeyDA Well it's needs to be tuned at full throttle. Problem is when the engine is under load the governor lets in more air which will lean it a tad. The best method I've found is to turn your carb to factory specs, tweak it by feel (I struggle with this), and then check your spark plug after a hard run to see if you're running rich or lean.

sounds to hard, dont even know how a spark plug will tell me, think ima rig somthg up so i can play with it while driving and do a mountan climb, i can send it full bore trying to get up mountnittany

Well if it's rich the plug will be wet and sooty. If it's lean the plug will be white and ashy looking. Ideal is somewhere in the middle lol.

Here's a link with a nice chart:
https://www.tuningmatters.com/how-tos/beginners-guides/check-spark-plug-correct-carburetor-setting/

I think a tan colour indicates a nice clean burn. Black is rich, clean lean.

well, if i go by color i need to take my fancy shmancy briggs 9$ spark plug out and put a normal one in.