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


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Old 06-06-2017, 05:07 PM
welsh.Z.S. welsh.Z.S. is offline
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Default 125 Vs 200

Hi guys is there much difference between an ec125 and an ec200 ? What's the most I could bore my 125 to whilst keeping the reliability ?


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Old 06-06-2017, 05:32 PM
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Zman Zman is offline
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I have owned both and still have a 125 as a spare bike. They both make similar peak power but the 200 has a lot more low end and midrange. The 125 weighs between 15 and 20lbs less than the 200 and you can feel that.

If you already own a 125 there are things you can do including a big bore kit to make more power. On my 125, I changed from the 38mm carb to a 35mm PWK carb (from an older kx125) and that helped the throttle response and it still revs to the moon. I cut the head to fix the squish and to increased the compression and that made a big difference in the bottom end and mid range. Even after those two changes the 200 still has more midrange and bottom end. I weigh 250lbs so I am not a typical 125 rider ;-)
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Old 06-07-2017, 06:31 AM
motopsycho87 motopsycho87 is offline
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All the local enduro races here tend to be won by 125's and 150's... But they're also ridden by spring chickens!
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Old 06-07-2017, 08:13 AM
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Anders Anders is offline
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Quote:
Originally Posted by welsh.Z.S. View Post
What's the most I could bore my 125 to whilst keeping the reliability ?
People here have bored out to 144cc. That's a quite common mod to many 125cc motors and I would assume quite well proven. Above that is unknown territory.
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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
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