49cc's on a Schwinn

Discussion in 'Motorized Cruiser Bicycles' started by FOG, Mar 3, 2019.

  1. FOG

    FOG Well-Known Member

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    Finished my front caliper mount and as usual got irritated at the appearance of my mig welds. They're absolutely functional. Nothing wrong with them at all. Back in my stockcar days I used to test them on concrete walls! I just don't like the way they look and until I get a tig welder AND learn how to use it I ain't gonna be happy. A well executed tig weld is my kinda jewelry.

    So I broke out with the bondo and now it looks too big again!

    DSCF0772.JPG

    Whatever. I'm over it. We're movin' on.
     
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  2. Greg58

    Greg58 Well-Known Member

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    Looks good to me.
     
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  3. curtisfox

    curtisfox Well-Known Member

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    Yes it does, nice job..........Curt
     
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  4. FOG

    FOG Well-Known Member

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    Progress. Back on one wheel and it grew a hydraulic disc along the way. Bench testing seems fine. Like Greg58 suggested all you have to do align it is leave the mounting crews slightly loose, pull the lever, and then tighten the screws. Easy money.

    DSCF0777.JPG DSCF0774.JPG DSCF0775.JPG DSCF0776.JPG
     
  5. indian22

    indian22 Well-Known Member

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    Coming along famously!

    Rick C.
     
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  6. FOG

    FOG Well-Known Member

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    I've got a chunk of aluminum up on the lathe for a rear hub and I'm needing some advice on what to use for a rear sprocket before I can finish it. What I like are made by JT Sprockets for small motorcycles. C49 high carbon steel and a very reasonable price are 2 of the reasons why. Something like this;

    https://www.ebay.com/itm/JT-Sprocke...881037?hash=item2ceb65d74d:g:R-gAAOSwP01c6IbW

    Only problem is they don't make anything smaller than a 1/4" wide 420 pitch, which seems like a bit of overkill for a 49cc Chinese tool motor. Altho we shouldn't pretend I haven't done that before ...

    With a lathe and the ability to make an accurate bolt circle I can use just about anything. Any suggestions?
     
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  7. Greg58

    Greg58 Well-Known Member

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    Fog a 41 chain is 1/4 between the side plates, that will work. I've run 41 for 8 years with zero problems.
     
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  8. curtisfox

    curtisfox Well-Known Member

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    Yep! And is cheep at farm stores, I am thinking 36 tooth is to high gear for 49 cc, don’t really know as don’t have one, just going by what I have read through the years. Hate to see you got through all theat work then have to change. .......Curt
     
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  9. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

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    Here's a thought... Maybe you could make a jack shaft on the seat post tube to help align the sprockets & also give you easier options for gear reduction?

    Go kart sprockets might also be a option?
     
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  10. indian22

    indian22 Well-Known Member

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    Curt & Norms advice is worth listening to, they've been doing this a long time.

    I just changed to a 36 tooth on my 66cc motor but it's been modified and produces double the output of a stock kit motor. If you have a lot of hills prepare to pedal a lot and from dead stops as well. If your commuting & can hold your speed most of the time then 36 tooth might be worth some pedal assist. So it's up to you & what you need or just want to experiment with FOG....have fun!

    Rick C.
     
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  11. FOG

    FOG Well-Known Member

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    Thanx guys and that's good enough advice for me! JT Sprockets and a #41 chain it is.

    Need to check size availability vs the various mounting patterns 1st but like VMB suggested I'll be needin' a jackshaft which'll give me a lotta gearing options anyway.

    Unlike a China Girl this little tool motor I'm using doesn't have any internal gear reduction. I'm working right off the end of the crankshaft mounted clutch which means I get to confuse myself with 2 ratios!

    FWIW, I was finally able to get up close and personal with a CG at the bike races and found they have 20 teeth on the crank gear and 82 on the clutch gear for a 4.1 internal reduction at the countershaft. Assuming a 10T countershaft gear and a 40T rear that's 4.1 for an overall ratio of 16.4 to 1. I'll be looking to start somewhere in that neighborhood and confuse myself until I get to what works best.

    Thanx again.
     
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  12. curtisfox

    curtisfox Well-Known Member

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    Good start, don’t go any smaller on crank, as it gets hard on chain going around to small of circle, 11 or 12 would be better. Good luck, I like home made stuff ...........Curt
     
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  13. FOG

    FOG Well-Known Member

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    Been cruisin' around the JT Sprockets catalog checking the availability of different sizes when I ran across their 801 series. Tooth counts range from 26 to 54 in 27 different flavors!

    http://www.jtsprockets.com/catalogue/sprocket/JTR801/

    That oughta be enough.
     
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  14. FOG

    FOG Well-Known Member

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    2nd hub for the back wheel is done and I didn't make no scrap. :) I'm learnin'.

    DSCF0801.JPG
     
  15. Greg58

    Greg58 Well-Known Member

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  16. indian22

    indian22 Well-Known Member

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    Nice hub!!

    Rick C.
     
  17. Tom from Rubicon

    Tom from Rubicon Well-Known Member

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    What Rick said.
    Tom
     
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  18. FOG

    FOG Well-Known Member

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    A necessary spacer to go between the bearings. It started life as a piece of stainless 7/8" barstock.

    DSCF0806.JPG

    It's all about overkill.

    Next up is another piece of stainless to thread on the end of the hub and mount a brake rotor. Keeps me busy ...
     
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  19. curtisfox

    curtisfox Well-Known Member

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    LOL! All for the better, or maybe forever....Looks good.......Curt
     
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  20. Greg58

    Greg58 Well-Known Member

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    Fog I wish I had equal to half your talent and patience, then I'd be three time as good as I am now.
     
    #60 Greg58, Jul 30, 2019
    Last edited: Jul 30, 2019
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