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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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  #11  
Old 10-13-2016, 11:52 AM
mat_man mat_man is offline
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Join Date: Jan 2011
Location: athens ga
Posts: 222
Default Re: Hurricane Mathew Build

New Suntour 8.8.8. Multiple Free Wheel 5 Speed 14.18.22.28.34. for 1/2 x 3/32
http://www.ebay.com/itm/New-Suntour-...-/400622986470

This is what I would use. High Quality.
You may be able to rebuild this freewheel and get larger than 34 teeth.
You may need to space the frame wider and add spacers. This has been done before on OCC's and may be documented.

Bicycle Scooter Sprocket Metal Wheel 3 Speed Freewheel
http://www.ebay.com/itm/Bicycle-Scoo...3D381730185526

Made in China. I would replace balls with grade 25 and pack with grease.
You may not have spacing issues. You may be able to rebuild this freewheel and get more teeth.


This might work:

Home built disc brake on motorized Schwinn Stingray
https://www.youtube.com/watch?v=BDpS0yzpWus

Last edited by mat_man; 10-13-2016 at 11:56 AM.
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  #12  
Old 10-14-2016, 11:32 AM
wrenching4fun wrenching4fun is offline
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Join Date: Jun 2016
Location: North Carolina
Posts: 10
Default Re: Hurricane Mathew Build

Thanks for the tips, Mat Man. The bike came with Shimano hardware (except for shifter which was a Sram MRX-7), but am open to Sun products if they're better. Took it out for a spin and broke the master link on the 415 main drive chain. Might have miss-installed due to excitement over getting finished. Replaced it and took another test drive. I think I'll ride as a single speed for a while and tweak everything. The frame has already been widened quite a bit to accommodate the OCC wheel. Don't know if I can squeeze any more space for freewheel without throwing everything out of whack or compromising the frame. Took a section of exhaust out to shorten pipe. Looks much better. The bike has plenty of power with the 79, a 212 would be overkill at this point unless I wanted to race( been there, done that, over it). After all, it is a motorized bicycle.
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  #13  
Old 10-17-2016, 05:05 PM
mat_man mat_man is offline
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Join Date: Jan 2011
Location: athens ga
Posts: 222
Default Re: Hurricane Mathew Build

The Suntour freewheel is 30 years old, not going to do 7 speed SIS index shifting.
(Cogs and spacers too wide). But quality is as good as Shimano.

LBS trash many 7 speed wheels. Cheaper to replace than labor to fix.
Chop off outer 3 cogs and weld it up. Free wheeling function not required.
Freewheel must safety wired to prevent it being unscrewed.

Exploded 7 speed freewheel:
http://forums.mtbr.com/singlespeed/h...ml#post7289205
Homemade SS Freewheels - step-by-step photo guide


Specialized Fatboy 20" has 4" tires, disk brake and 9 speed on 170mm spacing,
(same spacing as OCC ?) :
https://www.specialized.com/us/en/bi...atboy20/106643
Specialized Hub 170, Hi Hi disc, alloy, QR, 32h

Sub $200 Mongoose Fatboys might be the same.

Last edited by mat_man; 10-18-2016 at 01:22 AM.
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  #14  
Old 10-19-2016, 06:22 AM
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Tony01 Tony01 is offline
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Join Date: Nov 2012
Location: San Jose, CA
Posts: 741
Default Re: Hurricane Mathew Build

The 79cc will only take you to 40. You'll need to do some major mods to it of you wanna go faster. If you wanna do 50 better to go with a 212cc as it will do 55 easy as stock with governor removed. And you'll need a gear ratio of approx 8:1 on a 26" tire to do it. I dunno the size of that rear but if it's a 24 or 22ish an 6:1 will do. Your current gearing of around 14 will top out at maybe 25-30mph.

I have my 212cc setup with a 6.4:1 top gear on 26".
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  #15  
Old 10-19-2016, 03:48 PM
langolier langolier is offline
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Join Date: Jul 2015
Location: Wisconsin
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Default Re: Hurricane Mathew Build

Good looking build. You may hit 45 or 50 but with that kind of gearing you may have a hard time with hilly terrain. Like previously stated perhaps a 212 would be a better fit. I recognize that gas tank, I used to own a 1976 Harley SX-250 dirt bike.
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  #16  
Old 10-25-2016, 01:26 AM
wrenching4fun wrenching4fun is offline
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Join Date: Jun 2016
Location: North Carolina
Posts: 10
Default Re: Hurricane Mathew Build

Thanks, Langolier. I think these tanks came on 250 and 350 Sprints. Got mine on Ebay for $25 already cleaned, lined with a petcock and new cap. It fit the frame, so I threw it on. No worry with hills here on the coast. My house is only 14 feet above sea level. I thought about a 212 but I'm afraid it would attract the wrong kind of attention. It would fit and would be an easy swap. I think I'll try a multi-speed cassette first. Need to spec out the clearance. My other motorized bicycle has a Huasheng hooked up to a Shimano 3-speed. It's a blast to ride, but the Phantom pipe makes it sound like a Cushman scooter!
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  #17  
Old 10-28-2016, 10:59 AM
wrenching4fun wrenching4fun is offline
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Join Date: Jun 2016
Location: North Carolina
Posts: 10
Default Re: Hurricane Mathew Build

Swapped out my plain jackshaft for a threaded one with double nuts on both ends. No more problems with chain. Will be experimenting with freewheel and derailer next. Not much room to play with. Thanks for input on choices.
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