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High Performance Bicycle Engine Tips and Motorized Race Bicycles We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  #11  
Old 07-31-2011, 10:32 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I know what you're saying, but wouldn't it depend on my overall drive ratio? I'm starting with 12:1 which it may pull fairly easily. Also, I guess it depends on what rpm the motor builds power. Okay, I'll do some experimenting. Thanks.
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  #12  
Old 07-31-2011, 10:38 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Quote:
Originally Posted by msrfan View Post
I haven't got that far yet. I'm not sure of the motor specs. Have to check it out. I would like to have a Comet Torque-a-verter on this one but don't know if it has enough power to pull it.

Looks like I'll have to run with the AGK guys in the 100cc class. It's a little over 50cc. Should be fun.
How much over 50 cc?
It doesn't look like a very large or powerful motor.
What was it off?
Side valve or overhead valve?
What kind of rpm's?
I really doubt if it has enough power to run a Comet Torque-a-verter.

It looks like it could run in the 50 cc 4 Stroke Class......

Is your 5 hp Briggs race bike so hotted up now that you are in the
<11 hp Class?
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  #13  
Old 08-01-2011, 07:44 AM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

It's a 66cc pushrod motor. Got it in a bunch of stuff a friend gave me. I'll have to check the rpms when I get it going. I don't have a clue the exact hp of my Briggs bike. With the milled head and porting I may have gained a couple. All the internals are totally stock so far.
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  #14  
Old 08-05-2011, 10:22 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I got it up on wheels today, thanks to my machinist buddy, Dan. He cut and threaded the spokes I needed for the rear.







He also made head tube extensions so the longer neck forkes will fit. Then he made me special nuts for the rear axle so I can put it on my stand to tune it before riding.




Got my Comet 20 driver in today. It's almost as big as my motor.






Tomorrow I'll work on the kickstand and front sprocket.
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  #15  
Old 08-08-2011, 09:32 PM
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Don P Don P is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

HI msrfan
nice build i like very much. i got a 1957 tornado i picked up last week. could you tell me about the hubs you are using what they came from, how many spoked ect thanks.
Don P
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  #16  
Old 08-08-2011, 09:51 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Thanks Don. The brake hubs are from old mopeds. I collected them 25 years or so ago, so I can't tell what bike they're from. I was afraid they were going to go to waste because all my other bikes use 36 spoke wheels. Then I got an idea for a 24'' motorbike and most of them had 28 spokes. So I got a nice Schwinn DX frame down from the rafters, where it hung for 15 years, and fitted the hubs and wheels to it. The front forks are also from an unknown moped, as is the fuel tank. I still have lots of work to do, but I think it has some real nice lines. Is your tornado a 24''? Lot's of options for a DIYer out there.
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  #17  
Old 08-08-2011, 10:00 PM
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Don P Don P is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

msrfan no its a 26" but hay it can be lol.
Don P
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  #18  
Old 08-08-2011, 10:41 PM
kevinkrg6 kevinkrg6 is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Something about bikes like these just look cool....

Is it the straight fork?

And is the frame smaller than what those wheels are meant for?

Can't be just the yellow paint job.....
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  #19  
Old 08-09-2011, 06:54 AM
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The_Aleman The_Aleman is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Can't wait to see this awesome-looking bike done!
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Meh.
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  #20  
Old 08-10-2011, 09:56 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Today I fitted my Comet to motor adapter to my crankshaft.





It fit perfect.




Got my front brake hub to properly fit the forks.



Installed the rear sprocket onto the rear brake hub.




Then I found some stainless acorn nuts for the fork tops.




Going to work on a side stand tomorrow as well as the front pedal sprocket spacing. I'll try to have more photos soon.
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