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xs650 > > High Performance Modifications > > Top End Work > > New Pistons N Rings |
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Everything_To_Xs Full Member
Joined: Apr 01, 2008 Posts: 148 Location: Wolverhampton england
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Posted: July 13, 2009, 4:13 pm Post subject: New Pistons N Rings |
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Just got myself a brand new set of Rings for my 78 XS 650 Chop.
Thing is i took it apart because of a horrible scraping noise coming from the pots, i knew straight away what it was.
These are the resulting symptoms.
You think these are still in useable condition or is time for the bin?
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Jack Full Member
Joined: Mar 15, 2005 Posts: 411
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Posted: July 13, 2009, 5:04 pm Post subject: Re: New Pistons N Rings |
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Those skirts look severely scored and no doubt the liners are in the same condition.
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Everything_To_Xs Full Member
Joined: Apr 01, 2008 Posts: 148 Location: Wolverhampton england
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Posted: July 13, 2009, 7:26 pm Post subject: Re: New Pistons N Rings |
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Well ive re honed the cylnders so they are ok now. and i have new rings but i do not have the oney for new Pistons so all i need to know is will these pass?>
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Jack Full Member
Joined: Mar 15, 2005 Posts: 411
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Posted: July 13, 2009, 7:48 pm Post subject: Re: New Pistons N Rings |
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You need to mic liner and piston to assure proper piston skirt to liner tolerances are within specs cuz piston slap,poor ring seal and oil consumption could occur if out of tolerance
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xs1961 650Rider Supporter
Joined: Apr 23, 2007 Posts: 1808 Location: uk
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Posted: July 14, 2009, 2:21 am Post subject: Re: New Pistons N Rings |
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Thats right, so long as the piston to liner measurement is within tolerence then a few scrapes wont harm the piston performance(might even hold some extra lube!)If they're as rough as a badgers arse then rub em down with wet n dry if you're worried
_________________ 1 running 650
2.5 bikes in bits,
no time,
gradually losing intrest... God help me... |
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Everything_To_Xs Full Member
Joined: Apr 01, 2008 Posts: 148 Location: Wolverhampton england
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Posted: July 14, 2009, 6:21 am Post subject: Re: New Pistons N Rings |
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I wouldnt know i cant really say that i have Rubbed many Badgers arses. they are within tolerance anyway, just about
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dpmphoto Full Member
Joined: Apr 18, 2007 Posts: 485 Location: syracuse NY
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Posted: September 11, 2009, 12:13 pm Post subject: Re: New Pistons N Rings |
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there's a problem there somewhere i would correct that before continuing work
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xsjohn Full Member
Joined: Jul 30, 2006 Posts: 5857 Location: North Carolina USSA
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Posted: September 11, 2009, 12:26 pm Post subject: Re: New Pistons N Rings |
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Dimpled my piston skirts front and back 50 thousand mile ago for oil retention..... been doing that for 40 years..........
Also getting the sharp edge off the 2 compression rings with some light paper only makes since......did that 50 thou ago and still great compression at 74 thousand.........getting them to run cooler will also help......
Even lowered the compression to 8-1 at 60K......runs percect with 135-140 compression....and very smoothly.....was 150 at 8.7-1....at 60k.......
xsjohn
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