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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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Just do rings??
I rebuilt my 2014 ec300 last fall (Wossner Piston Kit), and are approaching 100 hours, so getting ready to do a freshen up this fall.
Since I bought the expensive forged piston kit last year, could I get away with just new rings? The piston looks fine to me, don't want to spend the money if I don't have to, BUT on the other hand don't want to make an expensive mistake by being cheap either. |
#2
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I have never done just rings but, thats just my preference. I suggest getting out your calipers and taking some measurements. Also may want to check the wrist pin for wear while you have it apart. Then you can make a decision based on condition of the parts in question.
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#3
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Pistons are relatively cheap. I wouldn't and never have done just rings
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Matt 1999 GG EC 250 Six Days 1999 Cagiva Gran Canyon 2001 Aprilia Falco 2001 Triumph Speed Triple for my 20 year old 2000 GG XC250 for my 20 year old 2003 Honda Rancher 350 for the wife |
#4
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Measure the piston to bore tolerance at the widest part of the skirt, that'll tell you. Look for signs of stress and heat underneath the piston too. Cracks etc...
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450 |
#5
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That and, I tend to do piston and rings one year, rings the next. Repeat.
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450 |
#6
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This is what I am thinking. I bought an expensive Wossner forged piston last year and it is in perfect shape. A new Wossner kit is upwards of $280, where as the rings are like $30.
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#7
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I measured mine after 2 years of abuse, 0.1mm down on the skirt, still ran fine but it's end of season now so finally getting it replated. Certain it could have ran a while longer
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2006 EC300 Enduro - Ignitech CDI - 38/NECW#2/165 FMF gnarly, FMF shorty, .50 front 5.7 rear 2016 RM-Z450 |
#8
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I have done "just rings" rebuilds @ low hours, but normally don't.
I would check for loss of diameter in the skirt zone, and any gap developing in the ring lands if your determined to do so. Piston fatigue is rarely visible by eye until it lets go lol
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2021 Beta 300RR 2014 Gasgas XC300R 2019 850 Pro RMK |
#9
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...At which point it becomes visible by ear!
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2013 ec200r |
#10
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What are the measurements and tolerances supposed to be for piston and bore? I have a 2013, assuming they are the same as the 2014? Thanks.
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