Polaris Discussions about Polaris ATVs.

installing new piston

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Old Mar 20, 2009 | 09:06 PM
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thedoc's Avatar
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Default installing new piston

I will soon be putting engine back together with rebored cylinder and new piston and I am wondering best way to do it

of course to take apart I slid cylinder off first and removed piston

if I do in reverse I am thinking it will be hard to get rings in properly [and a ring compressor is $17.50] but I am wodering if it may be possible to install piston/cylinder on bench [which is easy] and lower the lot over the crank and locate the gudgeon pin and clips
 
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Old Mar 20, 2009 | 09:31 PM
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Default installing new piston

ya u can do it that way, that is the easy way actually, thats how u have to install the pistons on the twins
 
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Old Mar 20, 2009 | 10:56 PM
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Default installing new piston

yes, I don't think I would be confident of getting the rings seated exactly right unless I was able to move the piston up and down on the bench without con rod connected, and actually observe the end gap
 
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Old Mar 21, 2009 | 12:00 AM
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Default installing new piston

its actually really easy. if you look at the bottom of the cylinder, youll notice that the base of the cylinder opening is tapered. this way you can compress the rings with your fingers, and using a little oil, the rings will go into the cylinder.

X
 
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