I have a 900 which I think has a 05 piston on 1 side and a 06 on the other. Assuming I do, when I replace the 05 piston what should I do with the 06 piston? Do nothing, change rings, change piston and rings. I haven't checked compression on it yet.
900 with 05 & 06 piston
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ONLY use the same year pistons with each other...
I doubt that you have 2 mis matched pistons.
I doubt that you have 2 mis matched pistons.
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The reason I think I have mismatched pistons is that I have 2 900's. I lost a piston in my Switchback and over the weekend I thought I would repair it. So I bought 2 06 pistons. I was shocked to find a damaged 05 piston on 1 side and a perfectly fine 06 on the other. The same Polaris tech. has replaced 1 piston on my RMK. I'm assuming now that I have a 06 piston on 1 side already with about 1500 to 2000 mi. on it. So going back to my original question what should I buy? Since I don't know for sure I will probably buy 2 pistons, but for future reference when would just rings be replaced and when would a piston also be thrown in?
The difference between the cost of the rings versus the piston is like $50.00. I would put 2 new pistons in it and then you know what you got.
What Dave said ^^^
I have a 900 which I think has a 05 piston on 1 side and a 06 on the other.
It's not a "sales gimmic" Replace both pistons with the same year.
In fact, you can NO LONGER even get an 05 piston from a dealer unless they have old stock on the shelves from 3 yrs ago.
Assuming I do, when I replace the 05 piston what should I do with the 06 piston?
IMO, Change both pistons at the same time... run both with the same age of piston.
Do nothing, change rings, change piston and rings. I haven't checked compression on it yet.
Change both piston kits... which come with new rings... only use factory Polaris pistons.
Check your crank runout at the same time and phasing of the crank(if the piston strokes are 180 degrees seperated) which could be off now that you have run different mass pistons.
The same Polaris tech. has replaced 1 piston on my RMK.
He obviously cannot read the TSB's that Polaris has sent out and I'd have to wonder if he is a good choice to have working on your sled.
I'm assuming now that I have a 06 piston....
Do you know for sure?? I still find it hard to believe that you have a mis-match situation and the sled ran ok.
but for future reference when would just rings be replaced and when would a piston also be thrown in?
Replace both pistons when you are servicing them, always, IMO.
For reliability and the effort involved... I replace the pistons whenever the rings are worn beyond use... most of the time the cyl is beyond spec as well.
You will need to re hone the cyl for new rings (or new pistons with new rings)... (diamond hone)
On a higher mileage motor... you also need to inspect and measure the cylinders. If the nicasil is worn you will need have the cylinders reconditioned...
If there is Taper in the cylinder... it must be sent in for reconditioning.
Sometimes they are beyond repair and must be replaced
If there is damage or scratching to the cylinder in excess of .007" then the cyl will need to be welded.
There are NO oversized pistons available for these motors (other than big bore kits).
The pistons can often wear out before the rings, especially on motors with long stroke and high rod angularity like on the 900's
IF you need cyl reconditioning... I like Millenium Tech..
http://www.mt-llc.com
BTW... How many total miles on the engine and have you had any crank or case work done or warranty engine parts replacement?
I have a 900 which I think has a 05 piston on 1 side and a 06 on the other.
It's not a "sales gimmic" Replace both pistons with the same year.
In fact, you can NO LONGER even get an 05 piston from a dealer unless they have old stock on the shelves from 3 yrs ago.
Assuming I do, when I replace the 05 piston what should I do with the 06 piston?
IMO, Change both pistons at the same time... run both with the same age of piston.
Do nothing, change rings, change piston and rings. I haven't checked compression on it yet.
Change both piston kits... which come with new rings... only use factory Polaris pistons.
Check your crank runout at the same time and phasing of the crank(if the piston strokes are 180 degrees seperated) which could be off now that you have run different mass pistons.
The same Polaris tech. has replaced 1 piston on my RMK.
He obviously cannot read the TSB's that Polaris has sent out and I'd have to wonder if he is a good choice to have working on your sled.
I'm assuming now that I have a 06 piston....
Do you know for sure?? I still find it hard to believe that you have a mis-match situation and the sled ran ok.
but for future reference when would just rings be replaced and when would a piston also be thrown in?
Replace both pistons when you are servicing them, always, IMO.
For reliability and the effort involved... I replace the pistons whenever the rings are worn beyond use... most of the time the cyl is beyond spec as well.
You will need to re hone the cyl for new rings (or new pistons with new rings)... (diamond hone)
On a higher mileage motor... you also need to inspect and measure the cylinders. If the nicasil is worn you will need have the cylinders reconditioned...
If there is Taper in the cylinder... it must be sent in for reconditioning.
Sometimes they are beyond repair and must be replaced
If there is damage or scratching to the cylinder in excess of .007" then the cyl will need to be welded.
There are NO oversized pistons available for these motors (other than big bore kits).
The pistons can often wear out before the rings, especially on motors with long stroke and high rod angularity like on the 900's
IF you need cyl reconditioning... I like Millenium Tech..
http://www.mt-llc.com
BTW... How many total miles on the engine and have you had any crank or case work done or warranty engine parts replacement?
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NOTE:
Honing a Nickasil cylinder is beyond the abilities of most people... special tools must be used and extreme care must be taken so that the nickasil is not damaged.
On 2-cycle engines... DO NOT use a ball hone for any reason as you will round the ports on the trailing edge of the hone process and probably damage the plating.
Honing a Nickasil cylinder is beyond the abilities of most people... special tools must be used and extreme care must be taken so that the nickasil is not damaged.
On 2-cycle engines... DO NOT use a ball hone for any reason as you will round the ports on the trailing edge of the hone process and probably damage the plating.
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Total miles is 2800 mi.and only warranty work was the 1 piston replaced.
My switchback would have had close to 2000mi. with the mismatch.
