72 CT70 Lifan Build

Discussion in 'Projects/Builds' started by wsurf4me, Feb 5, 2020.

  1. wsurf4me

    wsurf4me New Member

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    So I came across this on CL and couldn't pass it up, CT70 with Lifan motor, owner bought the parts but never put it together. From what I can see it's a 72 CT70HK1, the Lifan motor appears to be an older 125cc but I'm not 100% sure. Current plan is to put it together with the Lifan and have some fun. I will save all the original parts in case I want to do a restoration in the future. Been doing a lot of reading but any advice or guidance on the Lifan conversion would be appreciated. I've been looking for a guide but so far haven't found it. I can always wing it but like to see what others have done.

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  3. cjpayne

    cjpayne Well-Known Member

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    That original paint looks savable.
     
  4. OLD CT

    OLD CT Well-Known Member

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    Time to buy a trailbuddy or webllc wire harness, that's a place to start. The bike should have the front end cleaned and rebuilt, oil tuned with some good updated rear shocks and a bigger bore exhaust.
    Shelf that ''puny'' carb also. It's too small for a 125cc.
     
  5. wsurf4me

    wsurf4me New Member

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    Yes the paint is overall pretty good, planning on breaking it down and polishing it up - should clean up just fine.
     
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  6. wsurf4me

    wsurf4me New Member

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    Thanks, yes I saw a couple of places have harnesses, sounds like the best way to go. I'm thinking about an aftermarket front end and rear shocks. Also have a carb with the 125 but no idea what size it is, I'll take a closer look. Any suggestions for the exhaust?
     
  7. airblazer

    airblazer Active Member

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    Trail Buddy makes the Thumper 2, which is a pretty nice one that should work with that motor if you’re interested in retaining a semi-stock look. But I just checked their site and it shows out of stock. It might be available elsewhere though...
     
  8. wsurf4me

    wsurf4me New Member

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    So I did tear down today, as usual a few surprises -

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    All I can say is wtf?

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    Pliers were inside the frame, sitting below the gas tank on the engine. Maybe used to crank that sheet metal screw into the engine.

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    Ready for sandblast

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    Will finish breakdown tomorrow and give her a little shineup.
     
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  9. racerx

    racerx Administrator
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    Bad as that motor looks, from the outside, it's still an H-motor and worth holding onto. That brutalized intake bolt hole probably just needs a helicoil, or Timesert. The K0 muffler is a bit suspect but, if that's the original motor, you've snagged an amazingly complete...largely unmolested...HK1. I agree, the paint should cleanup pretty well. Use a mild abrasive and proceed slowly. It's very easy to remove lacquer and, since this was 2-stage (base/candy) it's also easy to change the color, i.e. create light spots. I'd start with carwash soap, followed by cleaner wax, in paste form. That may be all it takes, with some elbow grease. Detail clay may be helpful, if you have it. If more aggressive rubbing compound is needed, machine-compound containing a diminishing abrasive (used by hand) or swirl mark remover are your best bets. Old-fashioned/old-school rubbing compound will burn through lacquer like a propane torch through toilet paper.

    As for the front end upgrade you mentioned, this fork works better than you might think possible...with a fresh rebuild (cleanout + new seals) and "oil tuning"...better than the cheap Chinese inverted forks that seem to be on every "custom build" lately. The stock drum brakes do leave a bit to be desired, vs hydraulic disc. That said, properly adjusted, cleaned and wearing fresh shoes, they are quite adequate up to about 50-55mph. That's about as fast as this L125 can take you. Above 50mph, compression braking scrubs-off mph very effectively; a little bit of riding technique and you're fine.

    This engine really can't use more than a 20mm carburetor. 18mm is likely enough to keep it fed. If the supplied carb came with the engine, as part of a "kit", may as well give it a try...doesn't cost anything. If you do want to go bigger, I recommend a Mikuni VM20...you'll have to jet that for yourself, from scratch.
     

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