5hp briggs bike

Discussion in 'Introduce Yourself' started by briggsandstratton, Jul 11, 2012.

  1. briggsandstratton

    briggsandstratton New Member

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    i have a 5 hp briggs off roto tiller on a bike
    the motor cant rev up its geared to low? does alot of bogging and doesn't have enough torque with this gear setup? 10 to 10 to 10 to 50 with a jack-shaft
    was thinking 10 to 20 to 10 to 50?
     
    #1 briggsandstratton, Jul 11, 2012
    Last edited: Jul 11, 2012
  2. Dan

    Dan Staff
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  3. briggsandstratton

    briggsandstratton New Member

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    thanks for the link
     
  4. msrfan

    msrfan Active Member

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    My favorite motor to install on a bicycle.


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  5. briggsandstratton

    briggsandstratton New Member

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    wow those are some nice bikes
    -briggsandstratton
     
  6. A Future Pilot

    A Future Pilot New Member

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    I LIKE those bikes! What engine is it exactly?

    And are those custom built or does a company sell them?
     
  7. msrfan

    msrfan Active Member

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    Thanks, I have a lot of fun with them. Here we are at the races.


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  8. msrfan

    msrfan Active Member

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    They're all hand made on vintage Schwinn frames. Here's Briggsbiker's kick start bike.

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  9. 66cc

    66cc New Member

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    Those Bikes look amazing! The vintage frames look phenomenal!!

    How big is the motor 250cc?
     
  10. porkchop

    porkchop New Member

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    welcome briggsandstratton,a few things..do you have a clutch?you probably need to peddle to get bike up to speed,then slowly let the clutch out.there are different kinds of clutches to use.try on a slight downhill to get up to speed.one thing i have found out is having to try different ways of operating these machines.kind of have to see what it likes/wants....that 5hp should sling you down the road pretty good.
    keep us posted,good luck & have fun!
    :-||
     
  11. briggsandstratton

    briggsandstratton New Member

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    its got a centrifugal clutch and the pedals are gone to fit the motor but I'm going to try a 10t to 20t to 10t to 44 tooth gear setup
    -briggsandstratton
    .duh.
     
  12. msrfan

    msrfan Active Member

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    Thanks 66cc. The motors are the 13 series, which is 13 cubic inches. Here's one with an 8hp Briggs I made a about 15 years ago.


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  13. msrfan

    msrfan Active Member

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    You on the right track now with 8.8:1 ratio. I retained the pedals by tilting the motor forward, adding a compression release, belt drive and using a clutch with a one-way bearing. That allows for real easy pedal starts.

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  14. briggsandstratton

    briggsandstratton New Member

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    how fast are those bikes?
    -briggsandstratton
     
  15. msrfan

    msrfan Active Member

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    We've got them geared for around 40mph. They can go faster, but not on the tracks we race on. Some of the other racers go faster, but they spend a ton of money to do it. My crew are just budget racers having fun.

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  16. A Future Pilot

    A Future Pilot New Member

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    What exactly do you mean by "13 series"? Is that the raptor engine?

    Thanks!
     
  17. msrfan

    msrfan Active Member

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    No, it's just the two first characters of the serial number and designates the displacement as 13 cubic inches. These are just run of the mill motors we saved from the junk pile. Most are aluminum bore with bushing cranks, but they run pretty good. By the time we clean up the ports and up the compression a little, it adds some power.


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  18. dan@adelsigns.com

    dan@adelsigns.com New Member

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    I've built a couple of these and found a belt drive not only looks cool but works amazingly! You just need to have a rear wheel sheave or pulley from a whizzer for the right gearing. After running 5hp Tecumsehs and Briggs, you'll never go back!

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    #18 dan@adelsigns.com, Dec 23, 2016
    Last edited: Dec 23, 2016
  19. curtisfox

    curtisfox Active Member

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    AMEN! I had a factory made monark when i was a kid, and got hooked on belt drive, doing one now with a small Lauson motor.

    Nice builds you have, like them ..............Curt
     
  20. dan@adelsigns.com

    dan@adelsigns.com New Member

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    I have been building bikes for about three years now, a couple with tecumsehs and belt drives, but with a lever operated tensioner pulley for the front drive belt. Could you shoot me some info on that clutch setup and that flywheel that you are running?
     

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