how can i compensate for lost load on a lawn mower shaft so it will start without a blade?

i am trying to build a friction drive bike with a vertical shaft lawn mower engine but i invented a type of clutch that has the shaft free but it wont start free so i need a way to compensate for no load of the blade but take the load of when i engage the shaft to the wheel to make it go-go. some thing like a brake system. help is very appreciated. thx!!

Comments

3 Responses to “how can i compensate for lost load on a lawn mower shaft so it will start without a blade?”
  1. Poor one says:
    May 28, 2009 at 5:25 pm

    Its not friction you are short of, its inertia. The blade on a mower helps as a flywheel. A single cylinder engine requires a decent flywheel since much of the revolution provides no power.

  2. linlyons says:
    May 28, 2009 at 5:25 pm

    i suspect you're lucky it didn't start.
    if it had, with no load at all, it might have ruined the engine.
    if you'd been lucky, all the parts would have stayed inside, and not exploded and hurt you.
    engines need to have either a fuel control, or a load.
    you could probably just put a pulley wheel on the shaft.

    out of curiosity, how are you getting the power to the bike wheel?

  3. kerry k says:
    May 28, 2009 at 5:25 pm

    Poor One is right, the other guy is dead wrong. You need some kind of a flywheel. Check out the lawn mower shops, and see if any of them can help you with your problem. That would be the quickest way I know of finding what you need to make your engine run properly.


 
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