4 stroke engines

Discussion in '4 Stroke Bicycle Engines & Kits' started by Fuzzy79, Jan 29, 2012.

  1. Fuzzy79

    Fuzzy79 New Member

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    So I live in cali and I was wondering if the 49cc engines would be able to push me around my city at a decent clip. I am no small guy I am 6'4" and over 250lbs. I would like ro cruise at around 35mph. Can it be done without breaking the bank
     
  2. The_Aleman

    The_Aleman New Member

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    Greetings! I'm in Cali as well, just under 6'4" and 235, I have a 49cc Huasheng. It has adequate power for me, but I typically cruise 20-29. My bike's top speed on the flats is 34-36MPH, it wouldn't be able to hold that speed with any headwind tho. It's not so much the weight as it is the aerodynamics that hold me back.

    A GXH50 and a Q-matic might get you a cruising speed of 35, but again, probably not with any headwind. You'll either have to drop your expectations to a 30MPH cruise or use a more powerful engine, like a Predator 99cc.
     
  3. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    The 99cc Predator would be the ticket for your target cruising as TheAleman has suggested, providing you can get one from outta state. You can just about do it with a 49cc, but only if ya do break the bank, at least a little bit.

    dnut
     
  4. Fuzzy79

    Fuzzy79 New Member

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    Yeah I would like to run bigger, cause bigger is always better, but having to get my m1 or m2 id somethimg I dont really want to do right now so 49cc is wherr I am at. But even 20-26 would still be scary enough as it is. Now I was reading in another thread, could either of those motors run a shifter kit, or any engine out there?
     
  5. The_Aleman

    The_Aleman New Member

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    I have a shifter kit on mine. It doesn't affect top speed, only acceleration from a stop or uphill.
    A shift kit takes some decent mechanical aptitude to install and maintain.
     
  6. Fuzzy79

    Fuzzy79 New Member

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    Ok so the shifter kit, where would be a good place to look for them?
     
  7. The_Aleman

    The_Aleman New Member

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    Only SickBikeParts and Staton carry shift kits for 4-strokes that I know of. SBP's is the most popular here, it's in-frame only.

    Staton has a few different setups, but none of their in-frame kits are as compact as SBP's.
     
  8. Fuzzy79

    Fuzzy79 New Member

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    So do the shift kits work like multi speed shifts on bikes, or like a dirt bike/quad, or even a suicide shifter
     
  9. The_Aleman

    The_Aleman New Member

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    Well, the shift kits route the gearbox output through the bicycle's gears, so you shift it much the same as you would normally on a bicycle.
    Let off on power, shift, get back on power - like a semi-auto. You can "power-shift" if you want, but it's not very good for components.

    My SBP kit drives my 3-speed internal hub, and I'm very happy with how it works. It can take full-throttle shifts, but I don't do it anymore.

    [​IMG]
     
    #9 The_Aleman, Jan 29, 2012
    Last edited: Jan 29, 2012
  10. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    #98 Nashmoto's 50cc 4 stroke running a modified shift kit won the
    50 cc 4 stroke race last Oct 22nd at Grange.
    Also he came in 5th out of all the 66 cc Chinese kit bikes as
    the 2 classes were run together.

    Nashmoto is shifting through a NuVinci hub.

    PS: He won a 4 Stroke shift kit from Sick Bike Parts as the first place prize
    and the winner of the 2 stroke class got a shift kit too.

    [​IMG]

    [​IMG]
     
    #10 MotorBicycleRacing, Jan 29, 2012
    Last edited: Jan 29, 2012
  11. Fuzzy79

    Fuzzy79 New Member

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    Ok so a shift kit wouldnt matter on my single speed murry then
     
  12. The_Aleman

    The_Aleman New Member

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    No, not unless you replace that single-speed hub with an internally geared hub. Also, you lose the ability to use a coaster brake with a shift kit.
     
  13. Fuzzy79

    Fuzzy79 New Member

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    So that wouldnt bother me cause I wanted to switch to atleast a 3 speed rear anyways, and switch from the coaster brake to disks fromt and rear.
     
  14. Fuzzy79

    Fuzzy79 New Member

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    So I have been looking into the honda gxh50, and huasheng 50 kits bit cant find kits in stock for less then $500, does anybody make kits for less?
     
  15. GearNut

    GearNut New Member

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    The price tag of $500 is average. I highly recommend spending a little more and getting the EZM kit if you want to go the 49cc Huasheng rout. Just judging by what you expect out of it though you would be better off with the 99cc Predator though (or larger). They can run an EZM system with a little bit of easy modding. If overall width is not an issue for you, go with an AGK CVT system. For the record, I am building a 49cc Huasheng/ EZM kit right now. Legality was my final point on deciding.

    As for needing an M1 or M2 endorsement on your license for legalities, you will need one of those no matter what size gasoline engine you choose to run, 2 stroke, 4 stroke or whatever. Electric is the mode of power that lets you skirt around that requirement.
    I recommend going for the M1. It is just as much work to get as an M2 but it allows you to ride any MB, scooter, moped or motorcycle of any displacement.
     
  16. Ibedayank

    Ibedayank New Member

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    AGK does NOT sell a cvt system for the 99cc pred motor they sell centrifical jackshaft kit that uses a chain

    Jackshaft Assembly for 79cc HF & 99cc Predator
    [​IMG]

    CVT on a motorized bicycle
    [​IMG]
    pic shamelessly borrowed from Scotto
     
  17. Fuzzy79

    Fuzzy79 New Member

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    Agk is affordable go karts right?
     
  18. Fuzzy79

    Fuzzy79 New Member

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    Has anybody put some a 125 shifter kart motor and trans in a bike, or would that be to wide
     

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