Is it still a bicycle?

Discussion in 'Motorized Bicycle General Discussion' started by UncleKudzu, May 26, 2008.

  1. UncleKudzu

    UncleKudzu New Member

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    how bikable is a motorized bike? if the clutch were disengaged on one of the 70cc 2-stroke set-ups could a body still pedal without turning the engine?

    i'm wondering if i should motorize my decent old MB or build a dedicated motored bike. my old bike has a diamond frame which i've read is good for conversion, but i don't want totally get out of pedaling.

    the newb thanks you in advance.
     
  2. Dave31

    Dave31 Moderator
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    Yes you can still use it as a pedal bike but it is a little more dificult. You are turning alot more parts and have added weight to the bicycle. I have a single speed which I think makes it alot harder, with a multi-speed it should be much easier.
    I still like to shut the motor off and pedal sometimes but only on flat land or going down hill. But like I said I have a single speed and never have gone up a hill with motor off. Somebody who rides alot and is in good shape should have no problem just using the pedal's. :ride2:
     
  3. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Yes, you can still pedal the bike, but it will have a little drag & be about 20 lbs heavier.
    I would personally not put a engine on a bike that I planned on only pedalling for long distances. (build a dedicated bike for your motorbike.)
     
  4. UncleKudzu

    UncleKudzu New Member

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    thanks for the timely feedback, guys!

    well, that ain't me - i'm certainly not a long distance cyclist, so maybe i'll start with what i already own. my old bike has a sturdy double-butted steel frame with what looks to be plenty of room for an engine. it's pretty angular, though; i do wish it was more curvelicious like some of the bikes i've seen here :)

    when my Economic Stimulus Check hits i think i'll go ahead and order a kit. meanwhile i'll cast about for possible options in a different (cheap-o) bike.
     
  5. deacon

    deacon minor bike philosopher

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    Try the local thrift shops too....
     
  6. cruiser66

    cruiser66 New Member

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    Welcome,

    I built my motorbike around a 15 year old MB. It sounds like yours might be similiar to mine. I used a 4 stroke frame mount kit which bolted on with no problems or modifications. I had to use the wide crankset with a single chainring (came with the kit) so I have the seven lowest speeds for pedaling. With a 2 stroke kit, you can use the original crankset so you will still pedal with all the original speeds. Using a rack mount kit will also allow you to keep all the original speeds. The older MB is nice to start with because of compatibility with kits, good brakes, and multi speeds for pedaling. I would get my feet wet with the MB first and then maybe switch the kit over to a bike more to your lliking. Maybe even have two motorbikes. One 2 stroke and one 4 stroke.(^)

    66
     
  7. Egor

    Egor New Member

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    That is the best use for the Gov check I have heard of. You can say it is an economic boost for the economy and savings at the gas pump, and it is fun too. You will like the diamond frame, and they still look good. If you have enough room you can use a hanging tank. Have fun, Dave
     

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  8. cruiser66

    cruiser66 New Member

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    Here is my diamond frame with a 4 stroke kit.

    66
     

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  9. UncleKudzu

    UncleKudzu New Member

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    very similar, apparently - it's a fifteen year-old MB. i'm leaning 2-stroke right now, but who knows - i just discovered these possibilities a coupla days ago :)

    thanks for the photo! that does look sharp with the hanging tank. i've thought that the little teardrop tank that the kits seem to include might look odd sitting on a long, straight upper frame. is that tank a custom job, or could something like it be easily found?
     
  10. UncleKudzu

    UncleKudzu New Member

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    well, your diamond frame 4-stroke looks pretty darned cool, 66. that is very similar (down to the color, even) to my old bike.

    is the 4-stroke pull-start?
     
  11. cruiser66

    cruiser66 New Member

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    Yes it is a pull start. Has about the same resistance as a chain saw or weed wacker. As far as I know, all 4 strokes are pull start because of their centrifigul clutches. People generally start the 2 strokes by pedalling until the engine starts. You can get a pull start for 2 strokes, but then you will need a wider crankset to clear the starter. I use a center stand when starting mine so I can rev the engine to make sure it's warmed up OK before riding away. 2 strokes have a clutch handle which will disengage the engine once you start it. The GruBee gearboxes have a disengage lever which will disconnect the power to the final output sprocket. I have the old JL Hoot gearbox which has no disengager. I have had good luck with it so far..... A lot of different bits of info here, but as you are a newbie I'm sure you will be asking a lot more questions. Have fun!!!

    66
     
  12. stude13

    stude13 New Member

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    if you ride a bike with 70cc it is not a motor assisted bike. it is a moped. it needs turn signals, brake lights, hi-lo beam---get it?
     
  13. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Who's gonna know what it is?
    You WILL lie to that cop!
     

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