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Old 16 February 2013, 07:15   #1
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Yamaha 5hp 5BS Piston Rings

Hi, so I have purchased some new Yamaha genuine piston rings for my Yamaha 5hp 5BS air cooled engine but I don't know which is which. One of the rings is green on the outer edge - is this the top ring or the bottom ring? I guess one is specifically for oil wiping?
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Old 18 February 2013, 08:56   #2
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Hi are they the same thickness?
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Old 18 February 2013, 09:00   #3
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They do look to be. It was only the colour/coating that I could see was different.
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Old 18 February 2013, 09:01   #4
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Yes I think so it was only the colour/coating that seems to differ -
Apologies double posted!
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Old 18 February 2013, 09:46   #5
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I wouldnt have thought it matters, being a 2 stroke and 100/1 they wont have a lot of oil to scrape.
Steve
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Old 18 February 2013, 09:51   #6
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Ok thanks. Is it worth getting it honed too prior to fitting? I can't see any physical wear though! I'm just hoping the problem was the rings! Problem was similar to that of a failed reed valve but it doesn't have one as its a three port design! Apparently exhaust coming out of air intake!
The old rings seem really loose around the piston.
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Old 18 February 2013, 10:03   #7
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I personally wouldnt. Your technically removing a little more of the cylinder. I would put them in rebuild it and run in at a minimum of 50/1. I think its absolutely suicidal running motors at 100/1 even though the manufacturer says its ok. You wont see a difference much of a difference between running 50/1 and 100/1
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Old 18 February 2013, 10:15   #8
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Ok thanks, I shall give it a shot - fingers crossed. Thanks for the help.
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Old 18 February 2013, 11:44   #9
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Some rings have t1 and t2 writing on them.

T1 = 1 and facing upwards
T2 = 2 and facing upwards
Hope this helps
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Old 19 February 2013, 04:49   #10
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1N and 2N are printed on my rings (good spot, thanks). The 1N is green whilst the 2N is the black ring. Any ideas?
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