S
snowboatboy
New member
I posted this over in the polaris iq section, but i thought i would put it here to.
So last winter, about the end of december, I was riding my 2007 600HO rmk and completely grenaded the motor, about the end of december, I seized a rod bearing on the crank, as well as messing the pistons and cylinders pretty good. As I started to get going on the rebuild process learned that this is a slightly common occurrence with this sled as the crank bearing aren't as good as they could be.
About a month later I was completely rebuilt and ready for the first fire up. I ran it through a heat cycle and let it cool like i was told to then i fired it up just because who wouldn't with a freshly rebuilt machine. When i started it i let it warm up then gave it some throttle to spin the track and it would rev up.
So i tried to figure that out and eventually got a compression tester on it and found it had about 60 psi i thought that cant be good than tried to figure out the next thing to do.
Skip forward through summer to September I pull the head off and cylinders off and find that the new piston have scuffed my new cylinders and screwed everything up pretty good. So i called the outfit that i got the cylinders and pistons from, Millenium Technologies, and started to ask questions, they told me to send them back to them and they would check them for irregularities. They ended up honing the aluminum out of the cylinders and sending them back to me. I ordered a new set of pistons put it all back together to try again.
Same thing happens again
. Except this time I've only got 40psi. At this point I am getting discouraged and wondering what am i doing wrong. Plus I'm not super motivated to work on the mystery machine as I've got a kx500 snowbike that i picked up in the summer, but i pulled the top end apart again and found this. I've had guy i know who has quite a bit of engine experience come look at it, and he was wondering if there is supposed to be that much clearance between the top of the cylinder and the piston at tdc. And as you can see, the piston is worn, as well as one of the edges of the power valve. Any thoughts on this would be greatly appreciated, Thanks for looking.
Oh yeah if anyone wants to buy a rolling chassis with quite a few upgrade give me a shout.
So last winter, about the end of december, I was riding my 2007 600HO rmk and completely grenaded the motor, about the end of december, I seized a rod bearing on the crank, as well as messing the pistons and cylinders pretty good. As I started to get going on the rebuild process learned that this is a slightly common occurrence with this sled as the crank bearing aren't as good as they could be.
About a month later I was completely rebuilt and ready for the first fire up. I ran it through a heat cycle and let it cool like i was told to then i fired it up just because who wouldn't with a freshly rebuilt machine. When i started it i let it warm up then gave it some throttle to spin the track and it would rev up.
So i tried to figure that out and eventually got a compression tester on it and found it had about 60 psi i thought that cant be good than tried to figure out the next thing to do.
Skip forward through summer to September I pull the head off and cylinders off and find that the new piston have scuffed my new cylinders and screwed everything up pretty good. So i called the outfit that i got the cylinders and pistons from, Millenium Technologies, and started to ask questions, they told me to send them back to them and they would check them for irregularities. They ended up honing the aluminum out of the cylinders and sending them back to me. I ordered a new set of pistons put it all back together to try again.
Same thing happens again
. Except this time I've only got 40psi. At this point I am getting discouraged and wondering what am i doing wrong. Plus I'm not super motivated to work on the mystery machine as I've got a kx500 snowbike that i picked up in the summer, but i pulled the top end apart again and found this. I've had guy i know who has quite a bit of engine experience come look at it, and he was wondering if there is supposed to be that much clearance between the top of the cylinder and the piston at tdc. And as you can see, the piston is worn, as well as one of the edges of the power valve. Any thoughts on this would be greatly appreciated, Thanks for looking.Oh yeah if anyone wants to buy a rolling chassis with quite a few upgrade give me a shout.
.
, but it was only $250 so it seemed like a good idea at the time. And yes it most definitely is an upside actually knowing what is wrong. Anybody know if I can just get new rods put on the crank i got, seems like an easy fix since the stroke is right.
