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  1. #11

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    Light weight flywheel
    Depends in what you mean there, the inner rotor kits are rather hit and miss from China, and can leave your crank unbalanced, which leads to very nasty snapped cranks. The lifan 150 adjustable stator or the zongshen 160ho stator are lighter than a stock 125 stator, but I'm not sure if they fit or not (never really played much with the lifan 125)
    Lighter flywheel does equal better response, and higher rpm, but at the cost of torque, hence the flywheel weights you can get for 2 strokes, a naturally low on torque engine.
    Engine swap
    Unsure on the exact frame your using, but I squeezed a 160ho into a crf50 based motovert frame no worries at all.
    Another option for engine is the gpx125 that dhz sell, hi comp square engine that revs to the moon and has an amazing punch for a 125, with the advantage of running a stronger bottom end than most other 125s. I've owned one, and apart from not having as much torque as the 160s its a pretty close comparison to them. In a light bike, it's the perfect engine IMO.

    Sent from my ALCATEL_4034A using Tapatalk

  2. #12
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    rotn50 is offline Master Spanner Spinning Moderator
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    Quote Originally Posted by hannesd View Post
    i've got a lighter flywheel laying around on another engine i bought for pieces.
    is a lighter flywheel better or worse for overall performance on these engines.
    this thumpstar 125 has significantly more power/torque than my other lifan 125 engine...

    too bad that other engine's too much damaged, con rod bent, cilinderhead prettymuch destroyed from a broken off valve. it's a yx 140, rest of the bottom end should be fine.

    i might get a yx 160 of all else is upto spec (suspension-wise)
    Lightened fly wheels (irk) aren't worth it. And on a start in neutral only bike (clutch on the crank) I have seen them destroy the clutch into thousands of pieces and also destroy the clutch case.

    Sent from my SM-G930F using Tapatalk

    IF IT AIN'T BROKE, BREAK IT

  3. #13

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    nt an IRK but half the weight flywheel. don't want to loose too much torque.
    don't like the fact that the crank spins unbalanced without any FWW.

  4. #14

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    might aswell continue in this topic since it's my own on this genuine thumpstar :-p
    i was wondering what tyres to fit on these 12" front and 10" rear wheels.
    i plan on riding all kinds of soil,including some gravel maybe, so hard knobbies will apply.
    please add size of the tyres too so i'll know exactly what to look for.
    current tyres are no good anyway for what i do.
    the back tyre will need to be wider.
    front i want sharp knobbies to grip in grass, mud...
    and while i'm at it :-D what sprocket setup is advised for offroad? don''t know what current is, but all is stock.

    this is the bike i'll be fitting them to.
    later on i might be upgrading the engine with a yx 160 or whatever is advised/available in the same price range...
    Last edited by hannesd; 16-10-2017 at 06:56 AM.

  5. #15

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    I built a motovert frame (same size as yours) with a 160ho, was an animal
    Kenda washagual are the chunkiest 10 inch you can get i think, I ran a kenda milliville front, but can't remember the sizes sorry.

    Sent from my ALCATEL_4034A using Tapatalk

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