Help me please!!!!!

[mcomptonjr]

Hey to all you fellow slednecks!!!! I'm new to this site and hoping to find some help here. I have an 02 Edge 800. A few years ago I stripped a water pump belt and well, you can imagine the rest. After a messy divorce, I am back in the game, or so I thought.

I spent the last several months buying and re-building, and just fired her off for the first time today. After running for about 90 seconds, I heard a hammering and immediately shut it down. After looking for several minutes, I pulled the exhaust valves, and looked in to the piston, and got a shock. Somehow, the valve demolished the top of the piston all the way to the top ring groove. WHAT THE **** HAPPENED???? I mixed the fuel 50:1 so as not to burn down the crank and bearings on the first firing. I pulled the valves and nothing was out if place or loose.... I did however notice that the old piston out of the same side had some signs if valve damage when I took it apart. Does anyone know what causes this??? I have the updated valves, no tears in the bellow, and the knife cap was still on tight... ANY insight into this issue would be GREATLY appreciated!!!

 

[mjkaliszak]

Not big on an 800 POO motors but I believe that those ex valves have shoulders on them to prevent them from falling in ? Is the shoulder damaged ? Is the cylinder damaged ? I'm guessing here but something allowed it to travel farther than it's supposed to. Not trying to be a smart arse. was it the wrong piston ? I'm not sure you can put the exhaust V's in the wrong way ? only on 1 side ????

 

[trailshredder]

They hit if you put them in upside down.

 

[mcomptonjr]

Hey, thanks for the response. You are correct about putting them in wrong, they will only go in ONE way. As far as the piston, both were OEM pistons from my local dealer, and both were mic'd before installing.... Can spring pressure cause this??? The spring was stretched about 1/4 of an inch past stock length.

 

[jimfsr]

best guess is they were upside down. The caps will fit one way, but I believe the valves can be installed upsidedown in the caps. The valve should be stamped "up" or "top" somewhere on it. There should also be a raised portion on the valves to keep them from going in too far, make sure that is not broken off . As far as the spring pressure, no that wouldn't cause them to go into the cyl too far. It will however cause the valves to open at a different pressure/rpm. Make sure you have the oem springs at the correct length, unless the motor is modified to have the valves open at a non-standard pressure.

 

[raceinsnow]

The valves can't be put in the wrong way they won't fit.The valves won't hit the pistons anyways.Did you put the pistons in the right way?There should be a mark or arrow pointing to the exhaust side of the cylinders.If the pistons were put in the wrong way the rings will catch the ports and break off.

 

[trailshredder]

The valves can't be put in the wrong way they won't fit.The valves won't hit the pistons anyways.Did you put the pistons in the right way?There should be a mark or arrow pointing to the exhaust side of the cylinders.If the pistons were put in the wrong way the rings will catch the ports and break off.

Yes they can. I did this to my 02 XCSP 800. Learned an expensive lesson. The dealer told me I had put the power valves back in up side down and they made contact with the pistons.

 

[polarisrider1]

They hit if you put them in upside down.

You can not, I repeat CAN NOT put them in wrong. Your VES has stops and are made to go in one way. Some if not most of the early year valves are made of aluminum. Yes dumb move for a part that gets that type of heat. Anyways I suspect a ring breaking over a Valve issue. I had a 03 RMK 700 that the bolt on the bellows end broke off and valve just barely scuffed the piston as it melted. I put in Titanium valves and all ways well. You also can get stainless valves. We need Pics.

 

[polarisrider1]

Yes they can. I did this to my 02 XCSP 800. Learned an expensive lesson. The dealer told me I had put the power valves back in up side down and they made contact with the pistons.

Hey good bud, I totally disagree. I have had 01, 02, 03 ,04 ,05 ,06 (times were good) in 600, 700 and 800 liberty's and none of the valves can go in wrong. they just can't.

 

[trailshredder]

Hey good bud, I totally disagree. I have had 01, 02, 03 ,04 ,05 ,06 (times were good) in 600, 700 and 800 liberty's and none of the valves can go in wrong. they just can't.

Then maybe back then I took it to a crooked dealer. Just quoting what I was told. And it cost me dearly. So ever since I have paid attention to making sure it didn't happen again.

 

[polarisrider1]

Then maybe back then I took it to a crooked dealer. Just quoting what I was told. And it cost me dearly. So ever since I have paid attention to making sure it didn't happen again.

I truly suspect that is what happened. I do my own valves and live and breath Poo. I would never steer you wrong. I have had bellows with holes, the nut work loose that is above the spring and aluminum blade melt a bit on the points of it, but never could get them in backwards or to drop past the solid stops in the block.

 

[polarisrider1]

Hey to all you fellow slednecks!!!! I'm new to this site and hoping to find some help here. I have an 02 Edge 800. A few years ago I stripped a water pump belt and well, you can imagine the rest. After a messy divorce, I am back in the game, or so I thought.

I spent the last several months buying and re-building, and just fired her off for the first time today. After running for about 90 seconds, I heard a hammering and immediately shut it down. After looking for several minutes, I pulled the exhaust valves, and looked in to the piston, and got a shock. Somehow, the valve demolished the top of the piston all the way to the top ring groove. WHAT THE **** HAPPENED???? I mixed the fuel 50:1 so as not to burn down the crank and bearings on the first firing. I pulled the valves and nothing was out if place or loose.... I did however notice that the old piston out of the same side had some signs if valve damage when I took it apart. Does anyone know what causes this??? I have the updated valves, no tears in the bellow, and the knife cap was still on tight... ANY insight into this issue would be GREATLY appreciated!!!

Lets see pictures! Are you sure that a dry rotted carb boot didn't lean out the sled and that is ring your looking at? need pics. Pull the head and take a pic of top of piston, top of head and the valve.

 

[indy_500]

Well, you can put them in backwards, and once you start tightening the bolts, realize that the valve body is a half inch away from the cylinders LOL. Unless you are cavemen, you'd realize something does not look right if you put them in upside down... So basically, PR1 is right, it's impossible.

 

[mcomptonjr]

WOW!! All the info and insight have been really helpful. THANK YOU ALL!!! I did get it pulled down, and snapped some pics. I think after reading, I may have found my problem.

My dad would do odd and end things to try and help me out while I was at work, and after reading these, I looked at the piston. He installed them, and got one backwards. Just so happens to be the piston that got rocked!!! So good news is, he is replacing the cylinder and piston, bad news is now I have to wait another 2 weeks before I can get back up and running. NOTE TO SELF: keep motor in truck while at work!!!

 

[caged_beagle]

Too bad, Wayne that you're not a politician

I truly suspect that is what happened. I do my own valves and (I live and breath Poo.) I would never steer you wrong. I have had bellows with holes, the nut work loose that is above the spring and aluminum blade melt a bit on the points of it, but never could get them in backwards or to drop past the solid stops in the block.

because this statement would be loads of fun to take out of context!

As far as the OP's problem, I agree with PR1 (for once, HAHA). I had an '02 XCSP 800 and seeing as those valves needed cleaning almost as often as I filled up with gas I can attest that they only fit one way. But as racinsnow stated the pistons do have to be put in the correct way too tho.

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[1flatlander2]

how do you tell which way the piston goes

 

[trailshredder]

Ring gap on intake side

 

[wilson]

you're blameing dad for that...i'd blame maybe a helpfull neighbor or a buddy, but never dear ol' dad!!! lol

 

[fredster]

I think most pistons have a small arow stamped on them indicating "front" as in front of engine, too.......

 

[mjkaliszak]

because this statement would be loads of fun to take out of context!

As far as the OP's problem, I agree with PR1 (for once, HAHA). I had an '02 XCSP 800 and seeing as those valves needed cleaning almost as often as I filled up with gas I can attest that they only fit one way. But as racinsnow stated the pistons do have to be put in the correct way too tho.


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View attachment 29019

Good One.... LOL
PR1 , that's ok, I been walking around with " foot in mouth " for years....