Shift kits

Discussion in 'Performance Mods' started by avery schroeder, Jul 1, 2016.

  1. avery schroeder

    avery schroeder New Member

    What is up with everybody and these useless cheap shift kits? You people know you don't need them To go fast whatsoever. A stock Skyhawk does 43 with 28t sprocket and 200 lb rider. I'm doing 56 on my Skyhawk ported jug and cut piston and no reed. No dumb shift kit here

  2. avery schroeder

    avery schroeder New Member

  3. AutOtaku

    AutOtaku Member

    Your $0.02 is greatly appreciated. Let people do whatever the f**k they want with their builds.
    Timbone and Steve Best like this.
  4. jaguar

    jaguar Well-Known Member

    The shift kit may come in handy when the engine is low-power un-modified and they are heavy and need to climb hills.
    Timbone, Steve Best and AutOtaku like this.
  5. bakaneko

    bakaneko Active Member

    And, some people like the fun of shifting gears. It mimics the knowledge needed to ride a motorcycle well. I don't have a shift kit but I think it will be damn more fun with shifting gears for different situations. Nice looking bikes too. :p
    AutOtaku likes this.
  6. KCvale

    KCvale Motorized Bicycle Vendor

    Cool if most of your riding is down low tucked in wide open in a straight line.
    A 24t sprocket can't be any fun from a dead stop, especially in traffic.

    Shift kits aren't about how fast you can make it go.

    They are a way to add a transmission using your bikes gears.
    It's all about changing the gearing to meet the power limits of you engine on the fly so you can keep RPM's in the 'sweet spot' all the time like most every other monetized vehicle.

    Not so dumb bud, shifting revolutionized motorized biking.
    AutOtaku likes this.
  7. Arty

    Arty Active Member

    I agree with KC. A shift kit might not make you faster, but it sure helps to keep it in the sweet spot, and helps to keep you from thrashing the engine at high rpm all the time.
    Having said that, they do add a lot of complexity, and require more up-keep on the drive train itself.
    AutOtaku likes this.
  8. Frankfort MB's

    Frankfort MB's Well-Known Member

    I have to call BS on that.... A stock skyhawk barely has enough power to turn a 44 tooth let alone a 28 tooth, I've run a 32 on one before and it was maxing out at about 25mph because of overgearing..... And second thing, where are you finding 28 tooth sprockets???? Lol I've never seen one that small:D :p
  9. butre

    butre Well-Known Member

    I've seen them smaller.

    I agree that a shift kit is a waste of time compared to a good pipe and a good port job, but I don't agree that a stock skyhawk does 43 with a 28t. you'd be lucky to even get it off the line with that gearing, let alone get any speed out of it. overgearing is a thing.
  10. avery schroeder

    avery schroeder New Member

    Call what you want but a stock Skyhawk does 43 I have tested and proven all I did was port the jug and skirt the piston and it does 56 now
  11. avery schroeder

    avery schroeder New Member

    I'm telling you what I did with my brand new Skyhawk. Why don't you buy one and test it
  12. avery schroeder

    avery schroeder New Member

    Mzpartsmiami on eBay store has a lot of motorbike stuff other websites do not
  13. Steve Best

    Steve Best Well-Known Member

    Once you have a pipe, porting, aftermarket head and carb, it is getting hard to call it "stock".

    I believe you. My stock Skyhawk did high 30s with no mods at all. Was easy to get to 45 kph with very little work.
    I don't even have a tuned pipe on it (like you show in your picture) and I am over 60 kph now, with the stock 44t sprocket.

    Problem with a 28t sprocket is starting away, or making it up a steep hill or slow speed trail riding in sand. Even the 44t has trouble in deep sand.

    Nice bikes Avery, what are you using for pipes?

  14. Ttt

    Ttt Guest

    I'm talking in mph Steve, and your right I did forget to mention it did not have a stock carb or pipe but that is all that was not stock. I litterly took it out of the box and put the carb on and put a banana pipe on it. And I'm using a cr125 pipe a kx85 and kx 65. I didn't have the head or anything on when I did the "stock" runs. But I assure you it was the same jug and piston that came from the factory and a 28 tooth sprocket and got 40+Mph every time
  15. KCvale

    KCvale Motorized Bicycle Vendor

    Actually they do go faster, the upper gears are overdrive.

    That is true for 2-stroke shift kits, they are finicky and hard to install, and yet another reason I have moved to 4-strokes and electrics.
    My 4-stroke shifting system is more reliable and easy to maintain than most any direct drive.


    Welded on engine base with attached adjustable bearing tensioner wheel.
    Imagine, no tensioner issues ;-}
    Quality SBP freewheel crank assembly.
    Internal 5-speed SA disc hub in perfect alignment with it's pedal sprocket.
    Nice & quite #410 HD Z-chain for both chains.

    A 50cc engine doesn't put out much power compared to a tuned 66cc 2-stroke, but I can run with them, and in city driving getting from point A to point B the fastest because of gears!

    When you can get to 20mph from a dead stop in like 3 seconds and up-shift to change the 'sweet spot' it's a glorious feeling ;-}
  16. Steve Best

    Steve Best Well-Known Member

    Hey, just completed my first shifter!
    48cc Grubee motor, and a very rough jackshaft setup with a freewheel on the pedal.
    I am getting the "kick" of "lift the rear wheel by the seat" starting. Takes some getting used too.
    Using a lever cable shift as a thumb throttle.
    Tried a dual cable brake, not enough leverage, back to dual levers.
    Bike is a test bed. Steel jackshaft, 41 chain and frame are heavy. Version II will be aluminum and 1/8th chain.

    More testing to come. Motor is completely stock.

    Other news, I have a cast iron 49cc reed fed cylinder off a motoscooter that will fit on the larger China Motor.
    Ports are larger and I suspect double the HP should be possible. Cost is about $100. Have not tested yet. Riding!

  17. KCvale

    KCvale Motorized Bicycle Vendor

    Cool Steve ;-}
  18. HeadSmess

    HeadSmess Well-Known Member

    *twiddles thumbs and waits for a video, filmed from a moving car with speedo shots as well as GPS shots whilst holding steady alongside*

    56mph. just shy of 100km/h?

    good one :D
  19. Andy Birch

    Andy Birch New Member

    Are those expansion chambers off a CR80 motocross bike?
  20. CrazyDan

    CrazyDan Active Member

    If you read everything he did say it was a cr125 pipe.