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Old 12-04-2019, 01:41 AM   #1 (permalink)
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Default Freshn up motor

I have a 2003 summit 550f. It has 5645 kms. I noticed the psi on the cylinders are getting low around 105 psi. I would like to freshn it up. So being new I would like to know how would i go about installing new pistons/rings. How would I go about making sure the cylinders are good. And would I need to bore it out. Thanks
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Old 12-04-2019, 01:42 AM   #2 (permalink)
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Sorry forgot to mention, it's all stock.
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Old 12-04-2019, 12:29 PM   #3 (permalink)
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Current Sled(s): 2018 Back Country
Previous Sled(s): 2009 Apex, 1980 Polaris Star
Location: Lakes Region NH
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If it has not blown up it is pretty easy. Just go slow and easy with disassembly laying everything out. Buy a hone for a drill and do a simple hole unless the holes are scored, then you will have to bore, but in your case youre probably good to go.

Its a simple pin to put new pistons in. Use assembly lube so you don't scratch anything. Throw it back together and run it for break in. I always check plugs at 1000 rpm differences on a lake to make sure it is running right. I've had too many clogged oil lines or failed oil pumps over the years.
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Old 12-04-2019, 12:51 PM   #4 (permalink)
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Current Sled(s): 2003 Yamaha RX-1 2003 Ski Doo REV 800
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You should not have to hone the cylinders if they have nikasil coating on them and they are in good shape My wifes 2003 REV did all I did was put new pistons and rings in


Make sure you check the ring gap before installing
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Old 12-05-2019, 05:35 AM   #5 (permalink)
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Ok thanks for the info. Very much appreciated.
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Old 12-05-2019, 07:53 AM   #6 (permalink)
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Current Sled(s): 2018 Back Country
Previous Sled(s): 2009 Apex, 1980 Polaris Star
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Even better Brian. less work.
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