Are the HT kits suddenly... faster?

Discussion in 'Motorized Bicycle General Discussion' started by ultralight01, Jan 29, 2017.

  1. ultralight01

    ultralight01 New Member

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    I've done some research on this forum and some people claim that their HT bikes randomly kick into "turbo" mode and give them a super-boost while riding. One guy claimed he hit 40mph.

    I hit 40mph on my bike, that wasn't even fully broken in, on flat ground. It has 29" wheels, but I may honestly thinking that the engines they make recently are a little bit better than the first kits. Now that it's broken in it still does 40-45 on 25:1 gas mix, no upgrades.

    I've also had zero problems with that engine. I just don't like the manual clutch, the sprocket adapter, my Walmart bike... that build I did with an HT was really just a $200 experiment to tell me "Hey, this is really fun and addicting. And legal if you build it right".

    So now I'm selling that bike and building a custom 79cc predator bike. But I did notice on my sketchy rides of this bike that it was much faster than most I heard about on this forum.

    I used three methods to test speed. A gps, a bicycle speedo, and a car following behind.
     
  2. crassius

    crassius Well-Known Member

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    3 years ago, I started getting motors a bit faster and with shorter run-in times - now, I'm also getting a bit more low end torque

    on ebay, there may still be some older motors that might still have old tech back to even the unbalanced cranks - try to shop carefully there as someone with old kits still wants to get them sold
     
  3. StevenMain

    StevenMain New Member

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    Wow I must be messing up somewhere then I had to work my ass off to get 42 MPH and now with a shift kit 44mph.

    ported cylinder, YZ85 pipe, stuffed crank case, Reed valve, PZ20 Carb

    I've never been over 34 stock and it had no balls at all.
     
  4. ultralight01

    ultralight01 New Member

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    Well mine is different. It's an "upgraded" kit, with a lot of torque on 29ers! It also hits 45. So... maybe I just got some kind of fantastic engine, but it was still a cheap kit from eBay.
     
  5. crassius

    crassius Well-Known Member

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    I'm finding that the 40mm stroke on a 38mm rod works well - no mods.
     
  6. StevenMain

    StevenMain New Member

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    Ultralight if you have a dial caliper measure port roof heights I'm interested in the timing
     
  7. ultralight01

    ultralight01 New Member

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    Sadly I don't.
     

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