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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #1  
Old 06-17-2018, 06:15 PM
Cball917 Cball917 is offline
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Default 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


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Old 06-18-2018, 05:07 AM
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Quote:
Originally Posted by Cball917 View Post
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
I don't know about the 125, but on my 200, and 250, 300cc there is a drain plug in the bottom of the crankcases. Comes in handy when you need to drain the motor after filling it with water for various reasons.
Look for a hexagon head (17mm?) at the underside of the crankcases.
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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
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1986 Duc Mille S2
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Old 06-18-2018, 12:05 PM
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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.
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Old 06-18-2018, 09:59 PM
Cball917 Cball917 is offline
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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.
That sounds promising! I am not sure what you mean by non-tm though. Do i just mic the shaft to find out size?
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Old 06-19-2018, 02:04 AM
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I am not sure what you mean by non-tm though.
The very early Gasgas bikes used TM engines.
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"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
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Old 06-19-2018, 01:20 PM
Cball917 Cball917 is offline
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That sounds promising! I am not sure what you mean by non-tm though. Do i just mic the shaft to find out size?
How about these?
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Old 06-19-2018, 10:04 PM
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I am not sure if those Athena valves will work for a stock cylinder.
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Old 06-21-2018, 09:37 PM
Cball917 Cball917 is offline
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I am not sure if those Athena valves will work for a stock cylinder.
They fit like a glove
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Old 06-21-2018, 10:37 PM
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Great News!!! Are they aluminum or steel?
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Old 06-21-2018, 11:45 PM
Cball917 Cball917 is offline
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Quote:
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Great News!!! Are they aluminum or steel?
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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