What motoredbikers really need

Discussion in 'General Questions' started by RedGreen, Apr 14, 2008.

  1. RedGreen

    RedGreen Member

    Is a 4 stroke engine that has a clutch system like the two strokers and can be frame mounted. I like using my clutch to drag down the bike from speed. It also gives me I think a little more control.

  2. Definitely A hand clutch is awesome even for just the clutch starts. Beats having to pull a rope.
    Would a hand clutch need to be a bit more beefy in a 4 stroke seeing it has some compression to deal with..maybe a bit more than a 2 stroke..maybe I'm babbling?
  3. RedGreen

    RedGreen Member

    I don't know why it hasn't been done before. It seems so obvious to me. There are bunches of small motorcycles out there. I don't know if would be that much heavier pull. I picked the 2 stroke for that very reason though. If there had been a 4 stroke I would have gone that way.
  4. Zev0

    Zev0 Member

    Large, pulling a rope beats peddling your butt off.
  5. sparky

    sparky Active Member

    I agree... I can easily start my pull start by reaching around me & pulling... not too difficult at all. I hear too many problems with happy times not starting & riding in circles just to figure out something's wrong.
  6. SirJakesus

    SirJakesus Guest

    I like the lack of drag while pedaling a freewheeled centrifugal clutch setup. It keeps your bike a bike if needed (albeit a heavy one). Having a freewheel or centrifugal clutch also eliminates the need to clutch while going downhill to kill that annoying engine grab. The fact that you can just pedal off and start up the bike with the pop of the clutch is still kinda neat though, I just think the system isn't well engineered.
  7. Yea but when your on the bike trail and you're shutting it down every time you pass someone there has to be some type of shoulder problem you may have to deal with later if you're killing it then reaching around to start while moving constantly,although you could just keep the revs down as your passing for I hear these engines are quiet.
    My Happy Time is pretty loud which is why I shut her down when passing.
    I'll know by next week. 8 more days till Titan!
  8. BSA

    BSA Guest

    The problem with auto clutch is that you can stall the engine if you; by force of habit, rev up the engine to warm up. It would be quite funny if someone revved up the engine high and the bike shot off on it's own.
  9. RedGreen

    RedGreen Member

    One of these I will have to try a CVT trannied bike. Good points. I figured the CVTs had just as much drag on the bike as a clutch engine.
  10. I already have it in my mind when I get my Titan some kind of mechanical way to disengage the centrifugal clutch by way of lever so I can lock the lever down whenever I don''t want the centrifugal clutch shoes to grab the drum.
    Examples would be when your going down a steep hill or your simply warming up the engine.
    Now I know you can just get a freewheel sprocket but if I could rig a clutch lever and some stuff from Lowes it would ultimately be cheaper overall I would think.
    The device I have in my mind would stiffen the clutch springs when you pull the lever making it near impossible for the clutch to grab.
    I'll have to take a look when I have it.
  11. HoughMade

    HoughMade Guest

    On the Grubee 4 stroke, the gearbox can be disengaged using a standard clutch lever. It is more of an on-off switch rather than a clutch.
  12. sparky

    sparky Active Member

    No more shoulder problems than scratching your left butt cheek. I can tickle, pull the rope, & unchoke without looking around... it's really not difficult at all. Most of the time I just pedal a block or so away, then crank it up while I'm riding since I have this free left hand to do whatever I want. I've carried a 12-pack of Budweiser on my leg 3 or 4 times.

    I never rev up the engine unless I'm on it. Pedal away... crank engine... let it warm up at idle speeds... gradually give the throttle a couple pumps while I'm pedaling... then let 'er rip all the way.

    The clutch shoes won't grab the drum if the throttle's not engaged, right? Doesn't make sense that a solid sprocket turning the engine's driveshaft would affect the clutch... but I dunno.

    Really... if you've got a centrifugal clutch, you'd want the double freewheel hub. They're not that expensive (but prolly would be after you paid someone to lace the hub for you). So many benefits, like when you're hauling tail & the engine decides to seize... the freewheel will save your face. And the free hand is pretty nice, too.
  13. Alaskavan

    Alaskavan Guest

    Gee. My trike is 4-stroke, CVT (no clutch), freewheel, electric start, technically frame mount? What's not to like? Oh, I can't use compression to slow down. I'll learn to live with that.
  14. graucho

    graucho Active Member

    Ive been banging my head against the wall trying to figure out how to bring the mini chopper engine/tranny set up into the bike forum. We started a prototype on an old schwinn but there just to darn narrow. Even going with the wide crank. Mini choppers have 10-13" width to play with. My ideal set up would be a v frame, electric start, 4 stroke 49cc honda, centrifical clutch to a 2 speed jackshaft, then belt drive from the jackshaft to a belt style cycle sprocket. Smooth, quiet, fast, dependable. With pedals of course. Man, clean out the shop. Id better get busy.:cool:
  15. Alaskavan

    Alaskavan Guest

    It seems to me that the problem is the conflict between the crank/pedals and the width of the engine. The practical argument for a frame mount is the center of gravity issue. The easiest solution (as far as I can see) is to move one or the other. The addition of an engine makes pedaling efficiency somewhat irrelevant. I would suggest moving the crank/pedals and routing the chain past the engine.
  16. HoughMade

    HoughMade Guest

    How about a short crank? I had the Grubee wide crank on my bike, but over the weekend, I replaced it with the crank off of a kids 16" bike- the crank is just as strong and has the correct size bearing. Use of a smaller sprocket will return the mechanical advantage lost with the shorter lever...but you would have to pedal faster to go the same speed. That is not a problem for me since I pedal this beast just to start from a standing stop. the crank does not go on either side of the gearbox, but is now under it. The pedals are plenty wide enough to pedal, but is more width is needed, a means of makink the pedals themselves wider could be devised.

    You can just barely see where the pedal is inthis picture- I will get a better picture when I can.

    Attached Files:

  17. RedGreen

    RedGreen Member

    Perhaps you could set the crank further back like the old motorcycles. That might get it out of the way.
  18. Alaskavan

    Alaskavan Guest

    Hough, They make pedal extensions for use on recumbents (I think). Some loss of pedal speed from a smaller crank sprocket could be made up at the back of the bike. Anyway, all this is just speculation on my part, as I don't feel that the advantages of a frame mount on a conventional bike outweigh the disadvantages. I'm not looking to own a mini chopper. And I 'm not trying to go back to the future.
  19. highrider

    highrider Guest

    Freewheel sprocket that dont rotate when the wheels turn and the engine is not running and choke knob/dial on the handlebars so you dont need to bend down to adjust it.