06 rmk 900 seized

[BIGGDAWG]

Check the ring locators, they are on the wrong side. The pistons werte installed backwards and the ring hooked the exhaust port.

BANG !!! IT WAS OVER!!!!!!

good catch dan i didn't see that the first time.


i would just use the stock pistons don't think you can get much better. that is all the most of us use.

 

[Danbot]

I feel for ya dude.... looks alot like the aftermath of my first 900 explosion.
Glad to see you have all the parts, get that bad boy assembled and broke in before the snow gets deep!

 

[bustamove]

Check the ring locators, they are on the wrong side. The pistons werte installed backwards and the ring hooked the exhaust port.

BANG !!! IT WAS OVER!!!!!!

ring locators. do you mean where the ring gap is.. and i just checked the pistons where the gaps are pointing towards exhaust ports.. look like they defiantly caught somethings.. also whats does AUS with an arrow mean on the top of the piston?

edit: wait there is little ball/pin in the piston gaps where the ring goes.. im guessing that keeps the rings from spinning... just checked the piston out and guess what... for one indydan is a genius, second they installed the piston in backwards.. those locater pins were pointing towards the exhaust

 

[bustamove]

also is there any manual that is a little more specific then the deep snow manual for these engines?

 

[indydan]

Look close

Not a genius by any stretch, but thanks.

You guys will see this from a mile away once you take a good look.


Easy to spot If you look really close at your good cylinder by the exhaust you can see where the ring openings have been lightly clicking on the top and bottom....also you can see on the broken piston that the rear boost port opening is pointing frontwards right where the break is. Plus the wrist pin clip opening has the relief pointing forward and they are suppose to point rearward where the ring openings go.

1500k.............not a bad run for rookie move, To bad its things like this that give a very powerful motor a bad name.

Best big twin polairs has ever made.

Dan

 

[bustamove]

i just had a look at those pistons if you point the pins on the pistons towards i guess back of the motor. the gaps line up between the intake ports. also just looked really close at the "good side" it has chips near the exhaust port aswell.. i think they both were installed wrong.

in the manual is says to fill the cross shaft with break in fluid.. does the 2 stroke oil feed into there.. or does it have its own special fluid

also to seal the case together. what do you use? polaris special 3 bond stuff or just RTV sealant? which colour?

 

[Danbot]

i just had a look at those pistons if you point the pins on the pistons towards i guess back of the motor. the gaps line up between the intake ports. also just looked really close at the "good side" it has chips near the exhaust port aswell.. i think they both were installed wrong.

in the manual is says to fill the cross shaft with break in fluid.. does the 2 stroke oil feed into there.. or does it have its own special fluid

also to seal the case together. what do you use? polaris special 3 bond stuff or just RTV sealant? which colour?

The cross shaft does get lubed by 2 stroke oil... fed by the hose that attaches about 1/2 way down the oil bottle, so it only gets fed lube when the level is above that point on the bottle. I liberally apply white engine assembly grease to the cross shaft.

Use 3bond 1194 or equivalent, never use silicone to seal case halves.