Are there any 49/50cc engines out there with a right-sided crank?

Discussion in '2-Stroke Engines' started by NssOne, Jan 23, 2009.

  1. NssOne

    NssOne New Member

    OK, I don't know if the title was the best description, but I'm looking for a small motor that has the crank on the right side of the engine instead of the left. I'm trying to find something I can just replace the crank with on a small bike. I'm going to completely remove the crank and run strictly on the engine's power obviously. Thanks for any help, I'm just having a hard time finding the right engine I would like to use.
     

  2. ibdennyak

    ibdennyak Guest

    You could run some two strokes and with the right carb turn it upside down...............
     
  3. srdavo

    srdavo Active Member

    Like this?

    ScooterGuy.jpg
     
  4. skyl4rk

    skyl4rk Guest

    Here are some ideas on how you could achieve motor drive on the right hand sprocket:

    Motor direction: Motors that I have seen all turn counterclockwise from the perspective of looking at the drive shaft. There may be clockwise motors that I am not aware of. You can "reverse" the motor turn direction from the perspective of the wheel by turning the motor to have the driveshaft on the left or right side of the rider. The motor is still turning counterclockwise when you look at the drive shaft but it is reversed from the point of view of the bicycle and wheel.

    Belt or Chain: When using a chain or belt system, there is no change in direction of turn. Motors typically turn counterclockwise from the perspective of looking at the driveshaft. The direction that the motor turns has to be the same as the direction that the wheel turns. So when you look at the bike from the right side (drivers perspective), and the bike is going forward, the wheel is turning clockwise. When you walk around to the left side of the bike, the wheel turns counterclockwise. So if the motor is a counterclockwise motor, and it uses only belt and/or chain drive, it will have to drive a sprocket on the left side of the wheel.

    Gear: Whenever gears meet, direction of turn is reversed. With two gears there is one point where they meet, so direction is reversed. With three gears, there are two points where they meet, so direction is the same as the motor direction. If you have a counterclockwise motor and a gear system with an even number of gears it will have a clockwise output and would connect to the right side of the wheel.

    Jackshaft: a jackshaft does not change the direction of turn but it can shift the power take off from one side of the wheel to the other. As long as the gearing system is set up to drive the jackshaft in the same rotation as the wheel, you can choose to drive either side of the wheel.

    One way to power the wheel from the right side is to use a motor with a jackshaft, such as the Dax Titan. The jackshaft output sprocket can be moved to either side of the wheel. The Titan also has enough power that you would not need to pedal, which is necessary since you would be removing the pedal drive chain.

    This is theory since I have not worked on a Titan yet: You might be able to change the gear ratio to accomodate a typical rear wheel sprocket by changing out the jackshaft input sprocket. The current jackshaft input sprocket is a 10t sprocket and is set up to drive a 44t wheel sprocket. A single speed cruiser style bike typically has about an 18t sprocket (more or less). If you replace the 10t jackshaft input sprocket with a 22t sprocket, you should get enough reduction to allow powering the bike through the right side sprocket that was originally set up for pedaling.

    I hope this isn't too confusing.
     
  5. srdavo

    srdavo Active Member

    In the pic I posted below, thescooterguy's engine uses a planetary gearbox, (2 gears) which reverse the engine direction at the gearbox output shaft.
     
  6. cooltoy

    cooltoy Member

    I wonder if anyone has ever mounted a Chinagirl backwards in the frame, I dont see why that could not be done. I've also thought about rack mounting one of these kits.
     
  7. NssOne

    NssOne New Member

    Yeah, most of those solutions are too complicated. I'm looking for something with a clockwise crank. It's bad how there's no way to do this because it's not like you can just flip the rear wheel to have the sprocket on the left side. Hrm, I'll have to keep searching.
     
  8. cooltoy

    cooltoy Member

    I don't understand what your issue is. Is it money?
    How can we get you going and why don't you just go with a kit?
    Explain please
     
  9. NssOne

    NssOne New Member

    Well, I did find this nice small bike for about $80 I could use as my next project. I'm just looking into ways of simplifying the project by basically not having to mess with the rear sprockets, just using what's there. I'm going to be removing the pedals and probably the installed crank from the bike. But I was just thinking about it and I think I might do the jack shaft idea but through the bearings used for the pedals. I don't know, I'll see how it works out later.
     
  10. cooltoy

    cooltoy Member

    The kits come with everything needed including the rear sprocket. It takes about an hour to install the sprocket and you will never have to mess with it again.

    Go to You Tube , there is a guy that did what you are talking about and there may be more
    http://www.youtube.com/watch?v=uruaRsCHvk4
     
  11. srdavo

    srdavo Active Member

    Thescooterguy sells a kit to power your bike,the way you are describing. Contact him...
    http://www.motoredbikes.com/member.php?u=5522

    If you don't want answers....don't ask. :tt2:

    nothing really simple about home-built.

    you want simple....buy a friction drive kit.
    Installs in 30 minutes (give or take)... add fuel & go. :devilish:
     
  12. alex

    alex Guest

  13. duivendyk

    duivendyk Guest

    I seem to vaguely remember that the 50 cc Tecumseh engine ran CW.In any case if you want to power the bike via the crank you need at least a 20:1 reduction from engine crankshaft to crank (more if the transmission ratio crank to rear is more than 1:1).This cannot be accomplished with a single reduction, you need an built-in gear reduction in the engine itself also,as was shown in the picture shown.
     
    Last edited by a moderator: Jan 24, 2009
  14. thescooterguy

    thescooterguy Member

    on tanaka motors you can reverse the head and it will spin the other way .
     
  15. duivendyk

    duivendyk Guest

    Are you serious?,I thought that the problem is with the timing, which would be late if you reverse the direction of rotation. (after TDC).What the orientation of the head has to do with it is a complete mystery to me.
     
  16. thescooterguy

    thescooterguy Member

    its the the ignition coil normally if you turn the head around the flywheel with the magnet on it h its the coil from neg to pos, its supposed to gouthe other way . but with the tanaka's you can turn the coil also , so timing stays the same , love those tanaka's but for 300 bucks compared to 150.oo for a Mitsubishi ,that's too much money for just a balanced motor ,
     
  17. stude13

    stude13 Active Member

    ez-go golf carts change engine rotation with a shift lever. i would like to know how it works.
     
  18. thescooterguy

    thescooterguy Member

    arnt those electric ? just reverse the poles. negative and positive
     
  19. stude13

    stude13 Active Member

    no-2stroke single cylender
     
  20. duivendyk

    duivendyk Guest

    Frankly, I'm still in the dark as far as turning the head is concerned,may be I'm dense.Are we talking about a true cylinder head,or everything above the crankcase.Is there something special about Tanakas to justify such a price disparity?.The Mitsu.TLE 43 is a nice little 2 stroke, with that neat stratified scavenging system cutting down the HC pollution.
     
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