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DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

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  #11  
Old 12-19-2016, 12:38 PM
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ultralight01 ultralight01 is offline
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Default Re: 212cc 2-speed Schwinn rebuild

I love this bike, it's another inspiration for my build. Although I'd like to keep the pull start on. I wonder if it's possible to add your own sprocket to the flywheel and make a homemade electric start? Because it definitely takes a good 2-3" out of the width of the engine.
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  #12  
Old 12-19-2016, 06:29 PM
dogcatcher dogcatcher is offline
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Default Re: 212cc 2-speed Schwinn rebuild

This one could easily become a dream of mine. I really like the looks of it,
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  #13  
Old 12-19-2016, 06:52 PM
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scratchbuilder scratchbuilder is offline
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Default Re: 212cc 2-speed Schwinn rebuild

I like what you have done. Especially the shape of the rear triangle, the way the chain stays sweep down low. You mentioned ridin single speed for now. Can you cruise at 30 with low rpm's??
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  #14  
Old 12-20-2016, 04:00 PM
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Default Re: 212cc 2-speed Schwinn rebuild

Quote:
Originally Posted by dogcatcher View Post
This one could easily become a dream of mine. I really like the looks of it,
Thanks for the comments guys!!

Scratch yeah I can cruise low rpms down to around 25. Right now the clutch and shoes are worn so it's engaging and disengaging a bit higher at 30ish. But you know even with the 2-speed I could cruise at 25 in high gear. Cause on heavy acceleration it could shift at 35, but then with light loads and keeping light power on it I could keep the top gear engaged almost down to 25ish but it would start slipping. 30mph top gear cruise was the best.

I think I'm gonna swap the high gear box and primary chains to #35. This will fix my 2-speed and hopefully reduce the amount of maintenance it needs while I work on other 2-speed designs. I'll be starting this other build soon probably with a Briggs 5hp and will use it to test new designs. I wanna create a 2-speed jackshaft for motorized bikes, because the ones available are for minibikes and don't have the right ratios, adjustability or shift speed.

81 Schwinn by Tony K

This bike was stretched to look like mine! The chainstays are straight though.
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MxTrq clutch tuning | 212cc 2spd | CVT tuning

Last edited by Tony01; 12-20-2016 at 04:10 PM.
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  #15  
Old 12-20-2016, 08:19 PM
msrfan msrfan is offline
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Default Re: 212cc 2-speed Schwinn rebuild

Yeah Tony, I always wanted to make a high quality 2 speed with good go kart clutches, but it wasn't very cost effective. I've even thought of a 3D Motorsports hand clutch for low gear and a good go kart centrifugal clutch for high gear override. Maybe use half-link chain for more adjustability. You could even start with a cent. clutch for low and engage the hand clutch for high. I have lots of weird thoughts, but it may give someone ideas. A planetary would be the most compact.
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  #16  
Old 12-20-2016, 08:30 PM
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Default Re: 212cc 2-speed Schwinn rebuild

Awlright, 01 building again! From the looks of your parts, with an igh one shift not done in sync would fubar the mech with a 212. Looking forward to your trans plans.
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  #17  
Old 12-26-2016, 07:58 PM
Absorbed Absorbed is offline
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Default Re: 212cc 2-speed Schwinn rebuild

Hey I'm currently doing a 212cc Hf build myself. Having a problem finding a good enough bike frame to put it in.... any suggestions on what frame would fit, in a decent price range....
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  #18  
Old 12-26-2016, 10:00 PM
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malatious malatious is offline
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Default Re: 212cc 2-speed Schwinn rebuild

When I was a teenager, I scavenge a 2 speed gear box off of an old Cushman my uncle had laying around and put it on my mini bike. It had one chain from the clutch and one down to the rear sprocket. It had a suicide type shift lever. That gear box was bullet proof and really worked good. I don't remember it being any bigger than some of the Jack shaft setups I've seen. I would love to find something like that to use on one of these bikes, but hav'nt really seen anything like it since. With a 5 HP Briggs, in low I could get up any hill I wanted, and in high, my mini bike went around 35 mph, that was with 16" tires, and have no idea what the actual gear ratio was.
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  #19  
Old 01-25-2017, 06:29 AM
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Tony01 Tony01 is offline
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Default Re: 212cc 2-speed Schwinn rebuild

Quote:
Originally Posted by Absorbed View Post
Hey I'm currently doing a 212cc Hf build myself. Having a problem finding a good enough bike frame to put it in.... any suggestions on what frame would fit, in a decent price range....
Old schwinn works great long as you don't modify the frame with any stretching.. which is what caused both of my frame cracks I'm sure. Stretch it and it needs bracing. Also good, newer American cruiser frames with thicker frame tubes and dropouts are great too. Steel only (magnet sticks).




Well the noise under the valve cover got to be really bad and I decided to open it up and see. Also, since I am removing the motor, I'll be modifying my engine mount to drop the engine down approx 1" so that I can remove the valve cover without removing the engine in the frame. I'll be replacing the hex head bolts with flathead allen bolts so that I can bolt the blocks and mount plate to frame, then slide the motor right over them and bolt it in.

Untitled by Tony K, on Flickr

I took the motor out and found that my valve lash had worn out to at least .010" on both valves. So I was losing a very large amount of duration and probably wearing the cam too.

I was pleased to find the cylinder bore in perfect shape even after at least 100 hours of runtime. These engines might be cheap, but they are awesome!

Specs: This predator is a non-hemi with an RTC-9 head. People say anything RTC-6 to 9 and you're golden. Well it's true. This thing comes stock with smooth ports and 27/25mm valves. I looked at another 212 I have with an RTC-2 head and that one only has 25/24mm valves and comes stock with a .045" fire ring gasket, whereas this one comes with the .010" gasket.

This head also has automotive style split keepers on the valve retainers. I'm impressed!

I figured while I had it apart, I had better port/polish it and shave it down... I took out the large bumps that ramp up to the valve guides, and even took the valve guides down some, and radiused the crap out of the inside corner on both sides, which had a huge sharp edge/burr.

Before

IMG_2969 by Tony K, on Flickr

IMG_2970 by Tony K, on Flickr

After

IMG_2974 by Tony K, on Flickr

IMG_2975 by Tony K, on Flickr
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MxTrq clutch tuning | 212cc 2spd | CVT tuning
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  #20  
Old 01-25-2017, 06:42 AM
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Tony01 Tony01 is offline
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Default Re: 212cc 2-speed Schwinn rebuild

Took the gas tank mounts off.

IMG_2968 by Tony K, on Flickr

Love the rain riding...

IMG_2896 by Tony K, on Flickr

Hopefully be riding this thing with high compression tomorrow...
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I don't always listen to Alice in Chains..... but when I do, SO DO THE NEIGHBORS
MxTrq clutch tuning | 212cc 2spd | CVT tuning

Last edited by Tony01; 01-28-2017 at 08:18 PM.
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