I don't know much about reading spark plugs, but I think this is bad.

"ChooChooMotherFudger" (choochoomotherfudger)
08/22/2016 at 10:38 • Filed to: None

Also lots of oil in the threads, is that bad?

DISCUSSION (24)

SidewaysOnDirt still misses Bowie > ChooChooMotherFudger
08/22/2016 at 10:43

Are they all like that or is it just that one?

450X_FTW > ChooChooMotherFudger
08/22/2016 at 10:46

Is that from a 2 stroke?

RamblinRover Luxury-Yacht > ChooChooMotherFudger
08/22/2016 at 10:49

If that’s from a car, get an exorcism.

E92M3 > ChooChooMotherFudger
08/22/2016 at 10:50

Looks like it’s running rich and/or has some oil blow by.

ChooChooMotherFudger > 450X_FTW
08/22/2016 at 10:51

Nope.

ChooChooMotherFudger > SidewaysOnDirt still misses Bowie
08/22/2016 at 10:51

Only one plug in this engine.

ChooChooMotherFudger > RamblinRover Luxury-Yacht
08/22/2016 at 10:51

Its from a side by side. Not sure that matters.

deekster_caddy > ChooChooMotherFudger
08/22/2016 at 10:52

Not bothered by the oil on the threads, but that thing is not running well. Lawn equipment?

ChooChooMotherFudger > E92M3
08/22/2016 at 10:52

Could be running rich (I might clean the intake filter).

ChooChooMotherFudger > deekster_caddy
08/22/2016 at 10:53

It wasn’t running at all. Its from a side by side that we use to haul stuff around the farm.

MontegoMan562 is a Capri RS Owner > ChooChooMotherFudger
08/22/2016 at 10:53

That’s umm, that’s....not good.

SidewaysOnDirt still misses Bowie > ChooChooMotherFudger
08/22/2016 at 10:57

It looks like it’s either major blowby (if it has PCV routed back to intake - usually bad rings) or possible valve stem seal failure. Either way that’s gross. Have you checked compression?

ChooChooMotherFudger > MontegoMan562 is a Capri RS Owner
08/22/2016 at 10:59

I might be with you on that one.

ChooChooMotherFudger > SidewaysOnDirt still misses Bowie
08/22/2016 at 11:02

I have no idea if it (yamaha Rhino) has PCV, but there are 3 breather tubes coming out of the crankcase/transmission, so I am guessing no.
I am going to put a new plug in it and see what happens, don’t have a compression tester and probably won’t bother to get one.

RamblinRover Luxury-Yacht > ChooChooMotherFudger
08/22/2016 at 11:02

One of the last times I saw a plug like that was from a ‘74 Snapper lawn mower’s 8HP Briggs, which was so clapped out I had to add a cup of oil every time I mowed. Your rings are very likely shot beyond all reason - or you have PCV issues.

Tekamul > ChooChooMotherFudger
08/22/2016 at 11:16

Piston rings are overrated.

ChooChooMotherFudger > RamblinRover Luxury-Yacht
08/22/2016 at 11:22

I don’t even know if this has PCV

ChooChooMotherFudger > Tekamul
08/22/2016 at 11:36

Is that really the only explanation?

450X_FTW > ChooChooMotherFudger
08/22/2016 at 11:42

I’d be very surprised if it does not have PCV. Just gotta look around for a hose routing from the airbox or inlet tube back to the block

ChooChooMotherFudger > 450X_FTW
08/22/2016 at 11:45

I will check, its got 3 breathers coming off the crank case/transmission that are just open.

Tekamul > ChooChooMotherFudger
08/22/2016 at 11:48

It just seems like a lot of buildup.

Anything drastic done to the carb? I think the fastest way to find out what’s going on would be a compression test. That will tell you if it’s rings, or valve, or a really bad fuel mixture. If you’re just looking at compression, and not leak down, you can get the tool for about $30.

Also, any change someone put premix in it? That could add a lot of build up fast, and ruin the plug.

camaroboy68ss > ChooChooMotherFudger
08/22/2016 at 12:30

If it's just black and the tip wasn't wet, then it's running rich. Where the oil is coming from depends on if the motor smokes and how it smokes.

ChooChooMotherFudger > Tekamul
08/22/2016 at 12:41

Haven’t touched the carb. I would guess this plug might just be old and the motor doesn’t get up to temp as much as it should when we use it.
But there is a chance that someone put premixed in it.
If this doesn;t fix it and if it isn’t premix then I will try compression.

brianbrannon > Tekamul
08/22/2016 at 14:36

A compression test will do nothing to narrow down why it’s burning oil