Vmax 500 hot seizing

Got the 500 apart. Spent a few hours on the carbs as they were really quite dirty. Oddly the fuel screws were at 2 out on one and a bit farther on the other. The cylinder that did not have the problem had a nearly completely plugged pilot jet. even the passage from the pilot jet to the hole under the slide was blocked partially.

So looking at the cylinder. The PTO one is perfect besides a bit more blow-by than a 2000 mile sled should have. The Mag side has the same blow-by stains and also has a multipoint seizure markings. The exhaust side of the piston below the rings is torn up as a bit on the 2 corners of the intake side. Much less damage on the intake side. I can supply pictures if there is interest.

The Cylinder is good above the ports. Below the ports there is some grooving. I will see what the local shop says. If it were my sled and I had an extra $200 laying around I think I would replace the jug.
 
Yea if she's got the $ should do it wright wile it's apart.

Hmmm....wonder why so much blow by,shitty oil, oil pump not set right?

Post some pics. if your board.:)
 
Got a few pics but real busy getting ready for a trip and my 7 month old keeps grabbing my keyboard.

Blow-by is the gasses the excape past both rings. Some is normal.


DSCN1692e.jpg

DSCN1693e.jpg

DSCN1694e.jpg
 
Here is one of my 600's pistons at 6100 miles. This is the good one. It is the original piston with the pin locater flaw. I'll shoot more of it next to the 500 piston when I clear off my work bench. You'll notice your looking at the intake side and it is washed clean.

600at6100miles.jpg
 
Just an update and an example of what good care can do.

The owner of this sled took it on a trip last weekend in the Boyne area for 2 day's of great riding. Even though the temps were a bit cold the sled "Ran better than it ever has" "Infact I don't remember it this responsive"

We replaced both the pistons with OEM style. Had the bad cylinder acid washed nad both cylinders hard honed (not ball honed). Used all new gaskets including the $10 each exhaust manifold to cylinder o-ring style gaskets. I went thru the carbs completely. Checked every port, jets, passages, lines, screws and float. I repalced plugged up pilot jets and used half a can of carb cleaner on cleaning up the pilot circuits. I set the fuel screws to 1 3/4 turns from seated. Finally made sure the oil pump setting was correct.

I was impressed that the 500 was nearly as good in the power band as my 600 was thru 6000 RPM. I did not rev it past that.

I don't know what the milage it got but I expect that it was normal or better than normal.

It just goes to show you that thourough maintenence goes a long way. I can't wait to get a ride on this 500SX sometime.
 
FuzzButt said:
Just an update and an example of what good care can do.

The owner of this sled took it on a trip last weekend in the Boyne area for 2 day's of great riding. Even though the temps were a bit cold the sled "Ran better than it ever has" "Infact I don't remember it this responsive"

We replaced both the pistons with OEM style. Had the bad cylinder acid washed nad both cylinders hard honed (not ball honed). Used all new gaskets including the $10 each exhaust manifold to cylinder o-ring style gaskets. I went thru the carbs completely. Checked every port, jets, passages, lines, screws and float. I repalced plugged up pilot jets and used half a can of carb cleaner on cleaning up the pilot circuits. I set the fuel screws to 1 3/4 turns from seated. Finally made sure the oil pump setting was correct.

I was impressed that the 500 was nearly as good in the power band as my 600 was thru 6000 RPM. I did not rev it past that.

I don't know what the milage it got but I expect that it was normal or better than normal.

It just goes to show you that thourough maintenence goes a long way. I can't wait to get a ride on this 500SX sometime.
Click to expand...

Keep us updated on the sled FB..

What kinda honeing is hard honed,,better than ball honeing???
 
I was not there to see it but I think they used a stone of some sort. When I did my motor 2 years ago mine was simply ball honed.

If it were not for my marking the cylinders with a sharpie I could not tell which one had the damage.

Forgot to mention that was $310 to get it running again. Most likely the plugged pilot circuit (not the jet but the passage past the jet to the under side of the slide where the fuel comes into the venturi) and a plugged pilot jet in the other carb. Added to fuel screws being way to far out and not even set the same. The air horns were both gummed up with dirt and greasy debris. The air box was even covered in the greasy debris.
 
Ok i've never heard of hard honeing just ball,,do you remember the coarsness of the ball hone that you used??
 
When you "ball" hone the cylinder appears to clean up quite quickly which it does. Ball hones are great when "re-freshing" an engine thats not had a failure. The only issues with a ball hone is they wont fix anything past glazing or very small deposits of aluminum. They will not "straighten" out a cylinder. If theres a ridge at the top the best thing to do short of having it bored and going oversize is to use a hone that has long, ridged stones. These will help correct any taper, ridge or "low spot" issues you may have. They do a much better job of "straightening" up a cylinder than a ball home but require a lot more care, skill and patience to do a proper job. People that preffer, require much more precise specs use this type of cylinder hone........

As stated by FB, maintance is very much an important part of owner responsibility to ensure a long, trouble free life of there sleds engine, what ever make you may own!
 
I paid Tech Care in Waterford, MI to do the honing and acid work. They have done work for us in the past that I can't or did not have the time to do (read work on the Family's Polaris Sleds)

I think it was $45. $10 for the Acid and $15-20 per to hone. Beats buying the tools for one time use or dealing with muratic acid disposal. I figured it was safer for the pro's to do it. Besides my fingers are still healing from the 2 can's of carb cleaner and the the can of engine bright it too to clean the sled up.
 
An update.

Think we found the cause of the burn down. It seems to be getting real good oil milage. Less than an ounce in 350 miles.

Sled runs real good on straight gasoline for a short while. Running pre-mix in it right now. Looking into the $136 replacement pump
 
FuzzButt said:
An update.

Think we found the cause of the burn down. It seems to be getting real good oil milage. Less than an ounce in 350 miles.

Sled runs real good on straight gasoline for a short while. Running pre-mix in it right now. Looking into the $136 replacement pump
Click to expand...

Fuzz im shure her pump is lined up????
 
Let me throw this at you, that oil pump isn't gonna fail, its mechanical, however you did think that it got hot at the begining, since the water pump and the oil pump is belt driven, did ya check the water pump belt? I boned a 500 out not too long ago I'll see if I kept that housing, take a shim out of the belt pulley..................
 
It does not pump any oil at all. Belt seems to be within spec. I mentioned to her that this might be an over summer fix. Running premix if she was to go out again is no real big deal.
 
did you make sure the oil is feeding the pump? I had a guy blew his up twice, oil both times, he put a pump on the thing after the first failure, he brought it over, I fixed it, when checking the oil output there was none, you know when you take a quart of oil and cut that silver seal off the top and then dump the oil in your tank? I found one of those in the bottom of the tank..................
 
daman said:
Yup..I'm not trashing my sled over thes su*ky conditions..she'll sit right
there till we get somthing ,or ther's next year!!!!!!
Click to expand...
Amen brother, its not costing me any money to sit there. My buddies machines are being eaten up and mine is in great shape!!!! But they have soooooooo many miles. hahahaha The most expensive miles I have seen.
 
You must log in or register to reply here.


Back
Top