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Like others have said, that is not a burnt valve. That is oil burning on the head because, that is the Exhaust valve and that is where all the heat is centered. This is a result of too much heat, causes can be many....debris build-up on the cooling fins of that cyl head, debris build-up on grass...

I'd say your primer is not working, that is how you get a small shot of fuel in the venturi, thus easy starting. That kind of set-up is real finicky to get to prime right. The gasket just behind that plastic housing has a super small slot in it to pump a shot of air through a small passage in...

If you can put an inline fuel shut-off on it, shut off the fuel and let it run dry and stop running....shouldn't backfire then. I did that to my snow blower but, just so it would start up when the snow flies every winter after setting spring, summer, fall and most of the winter every year!

In business...seems like people don't appreciate someone trying to do them a favor....it almost always comes back to bite ya!

I thought this would fit right in on this site..............

Welcome....there is a lot of info and help, if you ever need it, on here!

What is the problem? Describe what it's doing and doing wrong.

Seems like I recall that at the last Kohler engine update that, they said Craftsman mowers are now built by MTD and wanted all Cub Cadet dealers to do warranty on them. I'm not saying MTD is the best thing out there but....it might be an improvement.

If all governor linkage and springs are on and set right, It's probably the governor assembly itself inside the engine. Seems like those are plastic and get brittle with all the hot/cold, hot/cold of a mower engine, and break!

That's kinda a toss up but......IMHO, Craftsman has been on the lower side of the scale for quite a while.

Make sure the push rods are on the lifters. Removing a sump pan without relieving valve spring pressure can move the cam and the push rods can fall off the lifters, rockers, among other things!

I can understand that.....so, If you can step off and on the platform and it re-sets or re-engages...that interlock switch is where i'd start looking at.

In that price range, I would recommend either a Bad Boy Avenger 54" or a Cub Cadet ZT1 ULTIMA 54" w/ either a Kohler or Kawasaki engine......I'm sure there are other brands of mowers as well but......we sell those so I know about them!

Did you buy it NEW 6 weeks ago? If you did, no need to try to fix it, just take it back to where you bought and have them repair it under warranty. Now if you bought it used, that's a different story...you're gonna have to put on your thinking cap!

"Bam.....bam bam...........Bam"........that's a heck of an explanation of a sound......my Bam and your Bam can be TOTALY different so that's hard one !

Huh.....not a bad record at all! 25 yrs in an auto salvage as the main yard dog and now i'm at 17 yrs at the mow'in house....... I'm just glad I still got all my fingers!

Make sure your new coils have a good strong spark, a weak spark outside the eng will be blown out under compression inside the eng. Black soot or Black smoke is fuel, maybe too much, maybe just not getting burnt. Make sure all valve train is working correctly. If all valve train is working...

Welcome and yes....we try !

But did you get the gear off?......sorry, I just had too!

90 - 110 lbs

I don't want to be the who tells you this but, as you are finding out, buying a mower online or from a box store IS NEVER A GOOD IDEA, you might be forced to keep the mower, if so, you might have to take the mulch kit off........good luck to you !

Sounds like the choke might not be working right, basically chokes are for starting only.....check into that.

Yep, you found your own problem....mulch kit ! We don't recommend mulch kits on mowers we sell but, if you must have one, don't mow tall grass and keep it mowed often to eliminate tall grass! Have the rpms checked, just to make sure you're getting all the blade speed you need....if you're low...

Lots of things can cause that : Dull blades, wrong blades, blades on upside down (yes, I have actually seen blades on upside down), worn out blades, deck not pitched right, deck filled up with debris (grass build-up), blades not spinning fast enough, mowing too fast. Is this a 2 or 3 blade deck?

Two thumbs up from me on Bad Boy mowers!

Make sure you don't have too much oil in it first, too much can make them do that!

Does your dipstick fit tight in the tube and it blows it out?

Is it choking itself too much, then clearing out after awhile...is there blackish smoke coming out the exhaust until it starts running right?

If all else is good with the new clutch, a 1" larger circumference clutch pulley can tight the belt beyond spec...check into that also!

My point was...getting the warranty repair done if it needs it and is still in the warranty window. Not many wants to wrench on a mower if it's still under warranty.

When buying a mower at a big box store.....where are you going to get it worked on if it needs a warranty repair? All the box stores around here DO NOT work on them. You should look into a mower dealership....it will pay off in the long run!

I suggest, the next new mower you buy, buy it from a dealership and not a box store. A dealership tends to do a better job at assembly and can work on it....plus, stands behind the warranty real well!

Just one side of the deck being 1/8" higher, will not be the cause of leaving a streak of grass......it's something else!

Lots of loose, or not tight enough to my standards, battery cables at the battery and solenoid come in our shop quite often. I suspect that will keep the battery from getting full charge from the charging system too.

Check compression of the engine.

That's right, the air vane type choke closes the choke when the engine is not running, no matter what the temp....as long as it is functioning the way it's designed and not stuck due to debris or whatever. It opens the choke when the engine starts/runs via air from the flywheel.

There are just too many variables that can cause those problems...it's just real hard to fix over the keyboard.

it's probably not choking itself out then

Is it blowing blackish smoke out the exhaust?

Is the auto choke an...air vain style or a clock spring style?

It (the cable) probably needs to be adjusted then, 1 cable that works both choke and throttle, can be a little tricky to get it just right to where you have full choke on, then full choke off, and still have full throttle!

Wow....that sounds like a NICE collection right there!

You said you changed engines. Some engines are designed to use 1 cable to activate the choke and the throttle also, while others use 2 cables, 1 for the choke and 1 for the throttle....all being the same brand engine.

Did you ever find your vibration problem? What year and hours are on your mower? As far as the set screws go, BB uses collars w/set screws for spacers on several spots on the mower and they don't tighten the set screws (because they act as spacers only) and the screws come but, the collars on...

IMHO....2nd rate design all the way around.....compared to the top selling engines! Again it's only my opinion!

I got to work on Generac engine today on a DC.....IMO, it's hard to believe anybody would use those!

Yes, the O.E.M. crossbrace is thin and weak. They have an improved crossbrace that is thicker and a lot better. Get one of them, use grade 8 bolts with plasti-lock nuts and use blue Loctite also. Also check the front and rear trans brackets that bolt to the frame, they break the ears off that...

That must have been a heck of a hill. If your mower ever gets away from you,so to speak, shut the engine off immediately. That is a strange one for sure. We sell Cub Cadets, among others, and we have a 2 page PDI sheet for CC that checks several dozen points on each mower, operational and...

Don't you know the old saying "you get what you pay for"....is true. If you don't believe this to be true, keep buying the cheap aftermarket stuff.....you will soon find out!

Ferris....IMO, they are one of the "top tier" mowers on the market. Good cut, built tough and have an outstanding warranty!