06 800 Blowing white smoke

[M5-]

First off I gotta say I pretty much know dick about Doo's but I have a chance to buy a 06 151 X that is blowing white smoke. So obviously I'm looking at at least O-rings (I was told they don't have head gaskets or am I wrong about that) up top but is this motor likely going to need a total rebuild. My understanding was that the 06's were pretty much bomb proof. The sled has 2500kms on it. Should I take a pass and if not what's it worth?\


Thx M5

 

[byeatts]

First off I gotta say I pretty much know dick about Doo's but I have a chance to buy a 06 151 X that is blowing white smoke. So obviously I'm looking at at least O-rings (I was told they don't have head gaskets or am I wrong about that) up top but is this motor likely going to need a total rebuild. My understanding was that the 06's were pretty much bomb proof. The sled has 2500kms on it. Should I take a pass and if not what's it worth?\


Thx M5

buy it cheap and at least pull down the motor and check it out. Could just be head O ring,or base gasket or ect.. Try to find out how and when it started this, Overheat at all?The history would be helpful

 

[jacmmaxwell]

How much smoke? and was this stated by the seller from the last season or was this when you looked at it? My sleds leave a pretty thick cloud of smoke down here at sea leval on a warmish day... get them above 3,000 and you don't see the smoke other than the smell from it ( but I kinda like that )

Just something to think about that's all.

 

[M5-]

The story is he was going in on the trail and it started to sputter and then blow white smoke. He tried to limp it out but couldn't so they ended up towing it so I'm pretty sure it must have over heated.

M5

 

[HiMark Racing]

I would be interested to hear what it is..When we hear white smoke we thing water in the piston area..but on a 2-stroke, shoot it could just be 2-stroke smoke..If you have an 06' I believe the coolant is all up top..the lower end isn't cooled like the 800R...question is what caused it to get hot..stuck thermostat (I've never seen mine), low coolant?? Maybe one of the (2) heads cracked. The heads come off easy..I would pull them off and look at them (suck or drain the coolant first)..check to see if the rubber O ring that goes around them isn't broke or pinched (replace them). Look at the pistons..do you see coolant in there?? Clean everything up and put it back together..If you were able to get most of the coolant drained..fire it up before you put the coolant back in..let it run for a few minutes...any smoke. Stop motor, put coolant back in..fire up again..smoke?

So that's the easy stuff to check with basic tools and knowledge..You can look at the heated carbs..make sure those are off..who knows maybe those are leaking inside and shooting coolant into the carbs (Very rare I would guess).


Good luck!

 

[dougrides]

Big white smoke

I am in the top end of my 06 800 151" rev as we speak. Late last spring I ended a trip 18 K. short of trailhead with great gasping of white smoke. Pretty easily identified as head gasket blown from sputtering etc. With heads off I'll get a peek at the cylinders for scoring. It's actually O rings that keep the water jacket from leaking into cylinder. Ohh that's not good! A look revealed that a piston has grenaded and I will be getting much deeper into this than first thought. My question; Does anyone know the torque setting for the head bolts? Won't need that answer right away now.

 

[HiMark Racing]

I am in the top end of my 06 800 151" rev as we speak. Late last spring I ended a trip 18 K. short of trailhead with great gasping of white smoke. Pretty easily identified as head gasket blown from sputtering etc. With heads off I'll get a peek at the cylinders for scoring. It's actually O rings that keep the water jacket from leaking into cylinder. Ohh that's not good! A look revealed that a piston has grenaded and I will be getting much deeper into this than first thought. My question; Does anyone know the torque setting for the head bolts? Won't need that answer right away now.

I seem to remember something like 35-45lbs.

 

[JedInUtah]

Only 21 lbs on an 05. I would think 06 should be close to the same.

 

[FNG]

My manual for the 06 800 HO states 21 Ft/Lbs for the head covers, remember to clean under the screw head and put just a dab of lubricant of some kind on the flat surface of the bolt that will mate with the cylinder head cover, this will ensure a more proper touque setting.

I think it's 29 Ft/Lbs for the cylinder bolts and 21 Ft/Lbs for the covers.

There is a gasket at the base of the cylinders and a rubber seal at the top of the cylinders under the head cover.

Have you checked compression? should be above mid 130's and less than about 8 lbs difference cylinder to cylinder or you will at least be needing new rings, a nice tight engine will be high 140's or more..

If you do find some problems and rest of the sled is clean and you are up for some wrenching then low ball them a bit and plan on rebuilding the engine yourself, it's time consumeing and kind of picky but very doable for the average joe with basic mechanical and wrenching skills and a reasonable tool kit,. The cost will be about $1800 to $2000 to rebuild the motor top to bottom so subtract a bit more than that from low blue book and give it a go.

Just rings pistons and gaskets, what, $350 + - $50 ?

At 2500 KM the sled is probably due for rings anyway and would be coming up on time for an engine rebuild in the next season or two so if you really like this sled then just do it now and then you will have confidence in it (and know your sled allot better).


Best of luck

FNG (die hard tinkerer)