5hp briggs bike

[briggsandstratton]

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?

 

[Dan]

Howdy Briggs, welcome.

There are some great builds and builders who used your engine. A ton of information.

http://www.google.com/cse?cx=partne...ef=&ss=#gsc.tab=0&gsc.q=5hp briggs&gsc.page=1

Post lots of pics!

 

[briggsandstratton]

thanks for the link

 

[msrfan]

My favorite motor to install on a bicycle.

 

[briggsandstratton]

wow those are some nice bikes
-briggsandstratton

 

[A Future Pilot]

I LIKE those bikes! What engine is it exactly?

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

 

[msrfan]

wow those are some nice bikes
-briggsandstratton

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

 

[msrfan]

I LIKE those bikes! What engine is it exactly?

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

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

 

[66cc]

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

How big is the motor 250cc?

 

[porkchop]

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!

 

[briggsandstratton]

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

 

[msrfan]

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.

 

[msrfan]

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.

 

[briggsandstratton]

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

how fast are those bikes?
-briggsandstratton

 

[msrfan]

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.

 

[A Future Pilot]

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

Thanks!

 

[msrfan]

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.

 

[[email protected]]

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!

 

[curtisfox]

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!

View attachment 84464

View 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

 

[[email protected]]

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?