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  #11  
Old 07-14-2012, 09:51 AM
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briggsandstratton briggsandstratton is offline
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Join Date: Jul 2012
Location: new york
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Default Re: 5hp briggs bike

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Originally Posted by porkchop View Post
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!
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
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  #12  
Old 07-14-2012, 11:58 AM
msrfan msrfan is offline
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Default Re: 5hp briggs bike

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Originally Posted by 66cc View Post
Those Bikes look amazing! The vintage frames look phenomenal!!

How big is the motor 250cc?
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  
Old 07-14-2012, 12:04 PM
msrfan msrfan is offline
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Default Re: 5hp briggs bike

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Originally Posted by briggsandstratton View Post
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
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  
Old 07-16-2012, 06:56 PM
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briggsandstratton briggsandstratton is offline
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Default Re: 5hp briggs bike

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Originally Posted by msrfan View Post
Thanks, I have a lot of fun with them. Here we are at the races.


how fast are those bikes?
-briggsandstratton
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  #15  
Old 07-16-2012, 08:09 PM
msrfan msrfan is offline
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Default Re: 5hp briggs bike

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  
Old 07-16-2012, 09:00 PM
A Future Pilot A Future Pilot is offline
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Location: Jackson, TN
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Default Re: 5hp briggs bike

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

Thanks!
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  #17  
Old 07-17-2012, 12:21 AM
msrfan msrfan is offline
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Default Re: 5hp briggs bike

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Originally Posted by A Future Pilot View Post
What exactly do you mean by "13 series"? Is that the raptor engine?

Thanks!
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  
Old 12-23-2016, 11:43 AM
dan@adelsigns.com dan@adelsigns.com is offline
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Join Date: Oct 2013
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Default Re: 5hp briggs bike

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!

IMG_1429.JPG

IMG_1430.JPG
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File Type: jpg blue harley small.jpg (795.8 KB, 18 views)

Last edited by dan@adelsigns.com; 12-23-2016 at 11:49 AM.
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  #19  
Old 12-24-2016, 09:04 AM
curtisfox curtisfox is offline
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Default Re: 5hp briggs bike

Quote:
Originally Posted by dan@adelsigns.com View Post
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!

Attachment 84464

Attachment 84465
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
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  #20  
Old 12-26-2016, 09:16 AM
dan@adelsigns.com dan@adelsigns.com is offline
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Default Re: 5hp briggs bike

Quote:
Originally Posted by msrfan View Post
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.



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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