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General Discussions & Announcements General Announcements, General Questions, e.g. What bike do I buy?, etc.


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  #11  
Old 05-09-2023, 02:35 PM
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Anders Anders is offline
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I run my 200cc approx 100 hours per piston. That is with an old, slow guy in the dirt.

For an unrestricted 125cc on the road I would run less than 100 hours, but only experience can tell. Type of riding, type of oil, mixing ratio etc are all factors in the equation. My advice would be tonopen it up at, say 70 hours and inspect.

For a restricted 125? Hard to tell. How resticted is it? 15 HP?

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  #12  
Old 05-09-2023, 04:29 PM
Noobi06 Noobi06 is offline
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Around 12hp restricted
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  #13  
Old 05-10-2023, 04:45 AM
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Quote:
Originally Posted by Noobi06 View Post
Around 12hp restricted
In that case I would expect a significantly longer piston life.
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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
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  #14  
Old 05-10-2023, 02:21 PM
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The thing about restriction of a race cylinder, is unlike a low hp cylinder where the ports are small, a race cylinder you have the same piston running over the same large ports at the same revs (unless a different cdi) just with less force pushing it down as the inlet or exhaust has been flow reduced.
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  #15  
Old 05-10-2023, 03:10 PM
Noobi06 Noobi06 is offline
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1. So theres basically no point in restricting it?
2. When Im driving on road, should I be in high or low rpms? Some say low rpms means longer lifetime for the piston etc. Also lower fuel consumption. Some others say 2 strokes should be at high revs. Which one should i be at? Or in middle?
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  #16  
Old 05-10-2023, 08:05 PM
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It's a 125, you won't have too much choice you have to cane it. Depends on your riding but you don't want it geared too low that you are needing to change into 7th when there isn't one as that would mean super high revs.

TBH I wouldn't want to go any faster than I'd trust skinny tyres and tiny brakes. Dirtbikes on the road are a wide compromise.
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  #17  
Old 05-11-2023, 04:13 PM
Noobi06 Noobi06 is offline
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Im having supermoto rims and tyres with better breaks.
Im thinking of having it geared so im riding around 6k rpm
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  #18  
Old 05-14-2023, 03:47 PM
Noobi06 Noobi06 is offline
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Today, when installing crank bearing, obviously, it didnt go smooth. After some punching on the outer rim, it went in all the way. Now, when I first spun it, it was sometimes getting stuck or binding. The more I spun, the less it happend. I also installed the crank just to see if the same thing would happen. After that, it doesnt get stuck anymore. Should I replace it or is it good to go?
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  #19  
Old 05-14-2023, 04:08 PM
swazi_matt swazi_matt is offline
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it is always going to worry you. easier to replace now than when it is back together or breaks, and bearing are pretty cheap
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  #20  
Old 05-15-2023, 03:00 AM
Noobi06 Noobi06 is offline
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The crank bearing is 70 fuc*** dollars. I really dont want to buy 1 more as I already broke one.
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