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.
_______________________________________________ "This'll either wake you up or put you to sleep forever!"- Red Green "Whatever you do you should do right, even if it's something wrong." - Hank Hill
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?
Crazy_Carl Seasoned Veteran
Age : 30 Join date : 2017-10-30 Posts : 2259 Forum Rep : 139 Location : Rochester, New York
@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
Crazy_Carl Seasoned Veteran
Age : 30 Join date : 2017-10-30 Posts : 2259 Forum Rep : 139 Location : Rochester, New York
I think a tan colour indicates a nice clean burn. Black is rich, clean lean.
_______________________________________________ "This'll either wake you up or put you to sleep forever!"- Red Green "Whatever you do you should do right, even if it's something wrong." - Hank Hill
really wish i could find a set of rings and new headgasket for this motor.
maybe some other rings off a newer briggs will fit, & 4 the headgasket just put RTV between head & Block that pushes Compression a tiny bit & will be sealing
RockeyDA Veteran
Age : 25 Join date : 2017-10-15 Posts : 628 Forum Rep : 19 Location : Bellefonte PA
Sending stuff means that U just run it til it blows up
so what? are you telling me to not put oil in it and destroy a motor that should be a cheepely saved motor? i mean theres no rod play and the wall looks pretty good, and i was able to save headgasket. if i could just find a new set of rings i would basicly have a new motor.
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SebastianAlbrecht Expert
Age : 18 Join date : 2018-02-27 Posts : 1299 Forum Rep : 45
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Sun Jun 02, 2019 7:30 am
Sending stuff means that U just run it til it blows up
so what? are you telling me to not put oil in it and destroy a motor that should be a cheepely saved motor? i mean theres no rod play and the wall looks pretty good, and i was able to save headgasket. if i could just find a new set of rings i would basicly have a new motor.
I send stuff as well, but I add Oil to my Oil Burners as well, cuz even do the Fact I send it instead of rebuilding it I want that stuff to last as long as possible with low maintenance & topping off Oil or changing it is not much work
RockeyDA Veteran
Age : 25 Join date : 2017-10-15 Posts : 628 Forum Rep : 19 Location : Bellefonte PA
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Sun Jun 02, 2019 9:39 am
i dont think the 16hp briggs is going to have a big fail, i think its just going to keep loseing compression till its not derivable.
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SebastianAlbrecht Expert
Age : 18 Join date : 2018-02-27 Posts : 1299 Forum Rep : 45
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Sun Jun 02, 2019 12:48 pm
i dont think the 16hp briggs is going to have a big fail, i think its just going to keep loseing compression till its not derivable.
thats what I mean, just Run it til U cant use it anymore!
Double W Cross Ranch Seasoned Veteran
Age : 16 Join date : 2017-06-09 Posts : 2505 Forum Rep : 72 Location : Literally Nowhere, Texas
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Sun Jun 02, 2019 4:04 pm
Yeah, but you can damage the cylinder walls beyond repair this way. I think that you might have piston slap, and the longer you run it like that, the worse it gets and it's very expensive to repair.
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SebastianAlbrecht Expert
Age : 18 Join date : 2018-02-27 Posts : 1299 Forum Rep : 45
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Mon Jun 03, 2019 9:53 am
Yeah, but you can damage the cylinder walls beyond repair this way. I think that you might have piston slap, and the longer you run it like that, the worse it gets and it's very expensive to repair.
is it worth it TJ??
That Engine worked hard since 70s & is on its time to go downhill. Same with my 93 Flathead.. no rod knock or anything, but a leaking crank seal & worn rings & no feeling to fix it even due the Face I have severar Rings lying around, just would need a new crank seal...
RockeyDA Veteran
Age : 25 Join date : 2017-10-15 Posts : 628 Forum Rep : 19 Location : Bellefonte PA
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Wed Jun 05, 2019 7:55 am
well no one has links for rigns, so might be SOL on ever fixing it.
AllisKidD21 Moderator
Age : 21 Join date : 2016-07-10 Posts : 4835 Forum Rep : 231 Location : Ontario Canada
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" Wed Jun 05, 2019 8:01 am
Check out isavetractors.com, they have a $50 piston kit for the Briggs 320000 engines.
_______________________________________________ "This'll either wake you up or put you to sleep forever!"- Red Green "Whatever you do you should do right, even if it's something wrong." - Hank Hill
Subject: Re: 100$ Dation 16HP MTD 990 "Mud Train" 
Sun Apr 07, 2019 9:25 pm
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