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#34256 - 07/03/13 11:47 AM Grizzly smoking badly...
dirtfan07 Offline
enthusiast

Registered: 10/19/12
Posts: 297
Loc: NE Pennsylvania
Not sure what happened. Went riding on a hot day with a slow moving group. We climbed a mountain trail and then stopped at the top. An hour later I started it and it smoked a little. Got progressivly worse as the day went on. Last night when I started it it smokes badly every time you hit the throttle. Temp or oil light never came on. Fan is working. Oil is quite low. Seems to have lost a bit of power....

I'm thinking burned/ cracked piston or a broken ring? Anyone else ever have a problem like this? As a side note, their were 2 Rhino's on the ride with us and neither of them would start for an hour after climbing the mountain. I'm sure it was warm but I wasn't beating on it. We were going like 10 mph!!
_________________________
Proud 4th generation military. Thank you to all who have served

I've earned the names "Treefan" and "Deerfan"...

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#34266 - 07/03/13 02:28 PM Re: Grizzly smoking badly... [Re: dirtfan07]
Wildhorse800 Offline


Registered: 11/04/10
Posts: 1344
Loc: Between Bedford and Canada
If it is oil burning, then my first step is look into the airbox for oil. If you do find it in the airbox, just clean it out and refill the oil to middle of SAFE area on stick.

I would take it out and run it at normal speeds and see what happens.
Make sure it is the recommended weight oil. Sometimes that 0w-40 can be too thin as the engine warms. A thin oil can be pushed out breathers way more easily than a good 10W-?. It can be pushed out the breather and into the airbox if too much pressure builds in the crankcase. Its just how these systems work. 0W oil works great for engines with an oil reservoir or a larger crankcase. I ended up using 5W-40 in my sportsman 800 as the factory oil is 0W-50 but it was drinking it pretty good since new! I always break my stuff in correctly.
Blow-by is more serious as compression is bypassing the rings causing excessive amounts of pressure in the crankcase and can really push oil into the airbox.

You can also check the compression if you have a tester. I don't know what they are looking for, but I'd be guessing around 160 psi.

And 10 mph? Hope you were all in low. Not only will high do heat damage to your belt, but high can also lug an engine(too low of RPM for vehicle speed) that can burn valves, score the cylinder walls and can even burn a hole in the piston! When in doubt, switch to low!

I am assuming it is fuel injected.

bring it over and I'll take a look...


Edited by Wildhorse800 (07/03/13 02:34 PM)

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#34269 - 07/03/13 02:38 PM Re: Grizzly smoking badly... [Re: dirtfan07]
DirtyDeed Offline
addict

Registered: 10/16/12
Posts: 522
Loc: Wind Gap, PA
What kind of oil are you using? Dino or synthetic? Synthetics CAN have a tendency to sneak by the rings in SOME machines.
_________________________
2012 Brute Force 750 EPS (stock)
2012 Grizzly 550 EPS Camo and gun racks (wife's ride)

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#34271 - 07/03/13 02:53 PM Re: Grizzly smoking badly... [Re: DirtyDeed]
Wildhorse800 Offline


Registered: 11/04/10
Posts: 1344
Loc: Between Bedford and Canada
Synthetic or dino should have no bearing on it. Its the weight of the oil. 10 weight syn and dino are the same thickness and will flow the same. The problem is that people are using a 0W-40 instead of 10W-40 in the machines because it is "acceptable" for protection of the engine.
The problem is that it has to get hot enough for the molecules to squeeze tighter together thus resulting in thickening up to the posted weight, being 40 weight in this instance. So that 0 weight is too thin for an engine with clearances designed to start lubrication with a 10 weight. Your oil will bypass rings and seals much more easily. Trial and error can work, but you need to check the level before, during and after the ride to see if it is having any problems. This is just for the oil end of the discussion.

I stopped using my 5W-40 synthetic in my Teryx because it started using oil. Switched back to 10W-40 Amsoil and haven't used a drop in the last 3 months.

Of course, it comes down to the engine in question. There are many outcomes for each engine design, so it's more suggestion than definite answers.

Hope this helps!

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#34277 - 07/03/13 03:43 PM Re: Grizzly smoking badly... [Re: dirtfan07]
DirtyDeed Offline
addict

Registered: 10/16/12
Posts: 522
Loc: Wind Gap, PA


Regarding compression:

Standard compression pressure (at sea level) 480 kPa (4.8 kgf/cm², 68.3 psi)
(Minimum–maximum 420–540 kPa (4.2–5.4 kgf/cm², 59.7–76.8 psi)

dirtfan, let me know if you want that manual.
_________________________
2012 Brute Force 750 EPS (stock)
2012 Grizzly 550 EPS Camo and gun racks (wife's ride)

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#34278 - 07/03/13 04:00 PM Re: Grizzly smoking badly... [Re: dirtfan07]
dirtfan07 Offline
enthusiast

Registered: 10/19/12
Posts: 297
Loc: NE Pennsylvania
I took it to a local repair shop on my lunch break today. They are going to run a compression test and leak down but even he said it didn't look good after I started it up. He also said he found quite a few others having simular problems. Most are rings or pistons but a few a cracking the cylinders. It hasn't lost any water so I'm hoping it not as serious as the cylinders.

Honestly, when I bought it, the lady (yeah, I think I got suckered) said it had just been serviced. The oil looked clean so I never changed it. Up until the last ride, it never used any. I've put about 900 miles on it in 9 months I've owned it. I am guilty of riding too slow in high range and I was in high climbing the hill. This is the first auto atv I've ever owned; I thought it was better to error high to keep engine rpm's down?
_________________________
Proud 4th generation military. Thank you to all who have served

I've earned the names "Treefan" and "Deerfan"...

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#34279 - 07/03/13 04:08 PM Re: Grizzly smoking badly... [Re: dirtfan07]
DirtyDeed Offline
addict

Registered: 10/16/12
Posts: 522
Loc: Wind Gap, PA
which machine? I suppose there is no Yamaha Extended Service (YES) warranty? I thought yam used a ceramic sleeve in the 550, not sure when that started.

I wish ya luck.
_________________________
2012 Brute Force 750 EPS (stock)
2012 Grizzly 550 EPS Camo and gun racks (wife's ride)

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#34286 - 07/03/13 06:08 PM Re: Grizzly smoking badly... [Re: dirtfan07]
jays375 Offline
member

Registered: 10/16/11
Posts: 188
Loc: Northeastern Pa.
What year is it?The 02 and up till fuel injected had terrible air filters.Compression test will tell all.Tough buying a used machine.You really need to look them over hard.

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#34289 - 07/04/13 10:19 AM Re: Grizzly smoking badly... [Re: dirtfan07]
dirtfan07 Offline
enthusiast

Registered: 10/19/12
Posts: 297
Loc: NE Pennsylvania
It's mine, the 10 model that's having the problems. Clearly, this is something I did to it cause it didn't have a problem for 900 miles. Prob lugging it in high gear, working it hard with no air going through it, on a hot day, then shutting it right off with no cool down? This is also the first liquid-cooled machine I've owned and I never thought about it getting hot. Their is no mud or anything obstructing the radiator. Could it be a bad water pump? Again though, the idiot light never came on. What concerns me most is not knowing what caused it, therefore, I don't know how to prevent it again. Going to Hatfield in a month and its gonna be a lot hotter and steeper trails there.
_________________________
Proud 4th generation military. Thank you to all who have served

I've earned the names "Treefan" and "Deerfan"...

Top
#34291 - 07/04/13 12:40 PM Re: Grizzly smoking badly... [Re: dirtfan07]
jays375 Offline
member

Registered: 10/16/11
Posts: 188
Loc: Northeastern Pa.
Normal trail riding does not make a motor go bad.How many miles on machine?

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