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making a weedeater bike? Answered

the link below is a clamp that holds the engine on a weedeater bike. the good thing about this clamp is that you dont have to permanantly keep the motor fixed on the rear tire. you can cycle on flat roads and when nearing uphill, you can engage the motor with just one push of the clamp handle.    can someone with a mechanical knowledge make a video on how to make this clamp

https://www.youtube.com/watch?v=dZCfYu7e730

Tags:bikes

Discussions

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petercd

Best Answer 3 years ago

If you stop the video at 21 seconds you can pretty much see the entire mechanism. The portion closest to the motor bracket is threaded for ease of adjustment.

Why he had to go and wreck the entire plot with a hex socket drive is beyond me, 1 of those back axle foot pegs one sees on the bmx bikes would have functioned well.

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rickharris

3 years ago

Video now updated with more details

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modtrend

3 years ago

iceng...would be nice if you posted pics. but a metal shaft with like pic... would the friction hold better on the rough part?

shaft.jpg
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icengmodtrend

Answer 3 years ago

45 yrs ago pictures were made with negative cellulose film, had to be developed, projected on to Kodak paper and paid-for even the bad shots. I didn't own a camera then.

BTW your guy never lifted up the bike and even spun the wheel.

See the Solex Rickharris points out.

SolexBike1.jpgSolexBike2.jpg
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modtrendiceng

Answer 3 years ago

the solex is great... but the idea behind my story... is that i want to cycle on flat roads... but only engage the motor when coming to a hill. we have some mean climbs here in durban. from my home in westville to hillcrest is around 25 km. from around 10 km mark... the uphill starts. very beautiful countryside towns. that is why i like the design. but ill try and make that clamp or even look at a bmx clamp also

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icengiceng

Answer 3 years ago

My machine would lift up, then I would pedal and let the motor drop and friction drive would engage the drive wheel and self start on its own weight.

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modtrend

3 years ago

ill look into the bike stand... but works with a spring...

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Downunder35m

3 years ago

Apart from being highly illegal all you need is already in the video you linked.
Simply take some scren shots and make your ow measurements.
Otherwise ask the guy that made it as it would be the most obvious person to try.

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modtrendDownunder35m

Answer 3 years ago

ive been asking the guy for months... no reply from him. yup... it is illegal... but for use on private property.

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Downunder35mmodtrend

Answer 3 years ago

Well, in that case...
It is a simple lever mechanism as you can find it on any manual press.
But I would not go his way of desgin anyway.
I would mount the motor in a fixed position with it's metal frame so that the entire engine tilts down on the wheel.
With a long lever like he used it is very hard to keep the friction up.
Down here a lot of people use engines on their push bikes and the good one mount a second sprocket with free wheeling mechanism on the back wheel.
This way all is small and in a fixed position.

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rickharris

3 years ago

Solex have been doing this for years in France.

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iceng

3 years ago

Hey, I used to have manufactured gas engine on my bike with a front wheel drop down centered engine 45 yrs ago, never needed to replace the tire .

The big difference was it worked up-hill instead of revving a metal wheel that will spin heat destroy a tire in a minute.

Notice he didn't even manage to spin his wheel in place ! ! !

My friction drive wheel was a concrete casting with the shaft through the center and with a 20% larger diameter.