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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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2002 xc125 trouble
Hey guys I haven?t been on in a while being wide open coaching ball. I am hoping you guys can help me out. Last weekend we went on a pretty good ride. Bike ran great until we were almost back to truck. Kinda choked out and went to crank and had very little compression. Figured I may have broke a ring so I pushed it back to trailer. Tore into it this weekend and found the left side power valve broken and it did break a ring. That brings me to this..... the cheapest place I can find a valve is $110. The cylinder wall looks fine and mics out to about 53.85mm so I don?t think it?s ever been touched. The piston looks very good except for one tiny place in the top edge. So I have a few questions.
1. You guys have any better advice on fixing the valve. Cheaper?? 2. You guys think I need to change piston. ? 3. Last big question is when I left it last night with head off apparently the coolant hose slipped down from where I had it pinched off and filled the crank and rod cavity full of coolant. How do I drain this? Please don?t tell me I have to split the case Any help or info will be greatly appreciated |
#2
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Quote:
Look for a hexagon head (17mm?) at the underside of the crankcases.
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Anders "So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie) 2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper 2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper 1998 Bimota Supermono 1986 Duc Mille S2 1975 Guzzi sidecar hack 1961 Morini Corsaro 125 etc |
#3
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You can use yz125 power valves in the (non-TM) GG 125 engines. I think there were at least two different versions with different diameter top slide shafts so you need to verify you get the ones that cross over. The Yamihaha versions are a little cheaper new or you can find some good used ones on ebay if your budget so requires.
These pistons are the same as YZ125 pistons which are cheap so I would replace it. I would flush the crank and bottom end bearings with WD40 a couple times and blow it out with compressed air. I would then pour some extra premix oil into the crank area including down the oiling holes in the cases. |
#4
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Quote:
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#5
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The very early Gasgas bikes used TM engines.
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Anders "So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie) 2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper 2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper 1998 Bimota Supermono 1986 Duc Mille S2 1975 Guzzi sidecar hack 1961 Morini Corsaro 125 etc |
#6
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How about these?
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#7
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I am not sure if those Athena valves will work for a stock cylinder.
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#8
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They fit like a glove
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#9
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Great News!!! Are they aluminum or steel?
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#10
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Aluminum. Using The yz cross reference i will have a a new top end, power valves with new springs and gaskets for around $200
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