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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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  #21  
Old 08-11-2011, 12:05 AM
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culvercityclassic culvercityclassic is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Very nice, you are doing a great job on the bike. What motor is that???
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  #22  
Old 08-11-2011, 12:17 AM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Hey ccc. It's a 4MIX STihl. Dry sump pushrod motor with their unique oiling system. That's right, a four stroke that uses mixed fuel. Lots of torque and runs great. Headless top end, plastic one-lobe cam and adjustable rockers.
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  #23  
Old 08-11-2011, 07:54 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I had to make a special front sprocket, spaced out a little to line up with the wider rear moped brake hub freewheel. Sprockets came from an old 12 speed with a one piece pedal crank, and the hardware and spacers came from McMasterCarr. I used stainless button head bolts with nylock jamb nuts and plated steel spacers. After drilling the rivets out of the sprocket set, I used the center of one and the outer ring of another. I shortened the kickstand today but still too long. I'll try again tomorrow.



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  #24  
Old 08-11-2011, 08:39 PM
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culvercityclassic culvercityclassic is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I see you are very creative. Looks nice.
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  #25  
Old 08-12-2011, 08:38 AM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Thanks ccc. I just hope the little motor will pull the Comet. If not, I'll make a regular jackshaft and save the torque-a-verter for a larger engine.
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  #26  
Old 08-23-2011, 09:44 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I got my clamps made and on the bike. They will hold the motor by sandwiching it between two plates of aluminum that will be carved out according to the shape of the engine and bolted to the clamps.









Also worked on the gas tank clamps. Almost rteady to mount it to the frame.






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  #27  
Old 09-07-2011, 10:10 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

My computor is down for another week, so I'll try to post some photos using my wife's laptop.

I finally finished the motor mounts and put them on the bike with the engine attached.







Still have to install the carb and make an exhaust pipe.








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  #28  
Old 09-07-2011, 10:19 PM
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culvercityclassic culvercityclassic is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

That is crazy...I need to know if you designed and machined those because if you have that kind of ability we need to know. That looks so nice...tell us how you came up with that design.

CCC
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  #29  
Old 09-07-2011, 10:19 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

I bought some 24'' Kiniptions






Im real close to a test ride.




I'm going to need a shield to keep my leg out of the driven pulley.



Been watching Scotto and Jeff's race bikes. Very impressive.

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  #30  
Old 09-07-2011, 10:26 PM
msrfan msrfan is offline
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Default Re: 54 Schwinn 24'' DX My Next Race Bike

Thanks, ccc. Yes, It was a brainstorm I had because I needed a creative way to attach the motor sturdy enough to support the drive system. I hand cut and filed a lot of it and had a buddy with a mill rough out some more so I could hand finish them. A lot of work but achieved the look I was after.
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