help im about to burn my sled

[powderpusher]

so last year I bought a 01 artic cat 1m800 seemed to run fine but only took a short ride do to not much snow .later in the season when we got snow I went riding and the sled kept fouling and burnin maneto side plug so I tore jug off to find a piston with no skirt don't know how this sled even ran as previous owner mustve had it apart and cleaned all the broken skirt pieces out of block and put it back together.so long story short I bought new piston and put it all back together and it fired up on second pull and ran strong but after 5 minues of riding the motor locked up and seized tight after sitting and cooling down for 10 mins and new plug on magneto side again it pulled over fired up and I drove it home so today I fired it up with new plugs and five minutes it seized up again would love to know if anyone could give me anyideas on what may be causing this issue as id love to rde this darn thing this year.is it quite possible that I have a antifreeze leak into the magneto side cylinder causing it to burn up the plug and seizing up till it cools down?or could it be other issues getting so frusterated with this sled a gallon of gas and a match is starting o look like a easy fix any help would be greatly appreciated

 

[Lund]

so last year I bought a 01 artic cat 1m800 seemed to run fine but only took a short ride do to not much snow .later in the season when we got snow I went riding and the sled kept fouling and burnin maneto side plug so I tore jug off to find a piston with no skirt don't know how this sled even ran as previous owner mustve had it apart and cleaned all the broken skirt pieces out of block and put it back together.so long story short I bought new piston and put it all back together and it fired up on second pull and ran strong but after 5 minues of riding the motor locked up and seized tight after sitting and cooling down for 10 mins and new plug on magneto side again it pulled over fired up and I drove it home so today I fired it up with new plugs and five minutes it seized up again would love to know if anyone could give me anyideas on what may be causing this issue as id love to rde this darn thing this year.is it quite possible that I have a antifreeze leak into the magneto side cylinder causing it to burn up the plug and seizing up till it cools down?or could it be other issues getting so frusterated with this sled a gallon of gas and a match is starting o look like a easy fix any help would be greatly appreciated

Its great you did your own, but have you ever done one before?
Be willing to bet its a tolerance issue, did you size up the piston and gap the rings before putting together?

 

[X-rated]

save urself the aggravation and just light it on fire!!

 

[Mach1]

save urself the aggravation and just light it on fire!!

Shhhhhhhhhh lol

 

[brian h]

need to figure out if its a clearence issue or lubrication issue,ive never been a artic cat guy so cannot be alot of help with easy checks or problem with that engine.but with seizing up when warm will be a engine tear down to repair but repairing problem will continue if cause of failure is not fixed.alot of people fixed failed components and not what caused failure

 

[Riverjet]

Find someone that knows what they are doing to repair it. Don't look here, it will cost you money.

so last year I bought a 01 artic cat 1m800 seemed to run fine but only took a short ride do to not much snow .later in the season when we got snow I went riding and the sled kept fouling and burnin maneto side plug so I tore jug off to find a piston with no skirt don't know how this sled even ran as previous owner mustve had it apart and cleaned all the broken skirt pieces out of block and put it back together.so long story short I bought new piston and put it all back together and it fired up on second pull and ran strong but after 5 minues of riding the motor locked up and seized tight after sitting and cooling down for 10 mins and new plug on magneto side again it pulled over fired up and I drove it home so today I fired it up with new plugs and five minutes it seized up again would love to know if anyone could give me anyideas on what may be causing this issue as id love to rde this darn thing this year.is it quite possible that I have a antifreeze leak into the magneto side cylinder causing it to burn up the plug and seizing up till it cools down?or could it be other issues getting so frusterated with this sled a gallon of gas and a match is starting o look like a easy fix any help would be greatly appreciated

 

[JMCX]

Is this EFI or carbed? What do you mean by fouled and burned plug? Put up a picture of the spark plug. It wounds like the bad cylinder is running lean.

 

[CatMan16]

Is this EFI or carbed? What do you mean by fouled and burned plug? Put up a picture of the spark plug. It wounds like the bad cylinder is running lean.

2001 were all carbureted.


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[pano-dude]

If its seizing its damaging the nikasil on the cylinders.
Overheating it will damage the head o rings and they will leak.
You sure you got the air out of coolng system? Those sleds need to have front end elevated to burp air bubble out of engine after coolant is drained.
Piston in the right way?
Something sounds really wrong, needs a full teardown and inspection.

 

[Clode]

I would be questioning whether or not the previous owner properly cleaned the piston out of the bottom end, the broken skirt gets everywhere and it is impossible to get it all out without splitting the cases. It ends up in the bearings and can damage the rolling element cages.