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Quad
The Day Starts With OZATV !
Joined: 22 Oct 2006
Posts: 2773
Location: UP FRONT
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 Posted: Thu Oct 15, 2009 11:01 am Post subject: yfz 450 piston in 1/2 |
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just asking has any other people had this .
trying to race and motor stopped .
found that the piston was in 2 ,clean brake throught the pin.
is this normal for a cp piston. for about 10hours or less. |
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Sponsor
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Thu Oct 15, 2009 1:36 pm Post subject: |
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show us!
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2002 SE Banshee |
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YFZ 450 White bros
90cc 2 stroke / 110 4 stroke
Joined: 10 Nov 2008
Posts: 91
Location: Katherine N.T
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| Posted: Fri Oct 16, 2009 10:33 am Post subject: |
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i split my standard piston... just came into a corner, low revs, and she stop running, ended up having to get a new barrel.
was very different, i have heard from it happening on the yfz's a couple times too.
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the stuf on the 04 yfz... lonestar axle(thanks jono), protaper bars ,2+stem, Pro armour, jetted ,custom airbox (thanks to huskygoat),unifilter,Gibson LT a arms, Fox float x evol, 08 swingarm (thanks Quad), stroked( thanks quad squad) |
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Quad
The Day Starts With OZATV !
Joined: 22 Oct 2006
Posts: 2773
Location: UP FRONT
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| Posted: Fri Oct 16, 2009 5:27 pm Post subject: |
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| Yes common on the JE pistons as well this one 96mm |
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JONO
Roostin Away
Joined: 27 Sep 2007
Posts: 530
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| Posted: Sat Oct 17, 2009 6:17 pm Post subject: |
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| Quad wrote: | | Yes common on the JE pistons |
Thats a bit of a generalization, i wouldn't have thought splitting JE pistons in half would be a common problem otherwise they'd realize they were doing something wrong and change it. |
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PeteW
Moderator
Joined: 09 Feb 2006
Posts: 1877
Location: Doreen, Vic
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| Posted: Tue Oct 27, 2009 8:46 pm Post subject: |
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I have seen a fair few break but only on the older motors (up to 06) both JE and CP's cracked right through, usually 13:1 pistons that go (GYTR used to do the same)
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www.thumbpump.com
www.dirtcomp.com.au |
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4stroker
Joined: 15 Jan 2007
Posts: 1420
Location: North Queensland
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| Posted: Wed Oct 28, 2009 9:49 am Post subject: |
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if they all do it then it mustnt matter what they are made out of or how they are made, it must be to do with the skirt length or something? or rod ratio on the older motors?
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2002 SE Banshee |
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gazman
Big Bore, Stroked & Bling +
Joined: 08 Jul 2007
Posts: 346
Location: gold coast
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| Posted: Thu Oct 29, 2009 3:30 pm Post subject: pitons |
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| pistons don't usually just "break in half".The pistons in most modern bikes have very little below the pin to stop any slap. 13:1 comp sounds like a lot for unleaded,let alone leaded fuel and it is a biggish bore also.(they are prone more to detonation.)R u sure the engine is not detonating(pinging)? |
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DON450
50cc nipper
Joined: 21 Jul 2008
Posts: 41
Location: IN A DITCH
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| Posted: Sat Nov 28, 2009 6:44 pm Post subject: |
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| my je did the same!!! |
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