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DIY Home Built Motorized Bicycle (non kit) Post all about your home built rides here. Weedwacker motors, lawn mower engines ect. This area is for non kit builds

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  #11  
Old 06-22-2015, 10:57 AM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

The clutch was made for '99 and later Whizzers. I use them on Briggs bikes because the spacing is correct. They're belt to belt with a sprag bearing, along with my compression release, lets you pedal start the engine.
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  #12  
Old 06-22-2015, 06:54 PM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Chris's Briggs And Stratton Bike Build

I'd think maybe out there is a type that may not need the pedal starting feature of the clutch that could be cheaper than Ebay 175 plus shipping from Taiwan, but use a static jackshaft? I'll look around. Thanks!
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  #13  
Old 07-03-2015, 02:07 PM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Greg and I cut and welded in the gussets, engine mounts, steering stop, tank mounts, and rear brake arm button.



















Engine assembly coming soon. That leaves intake tube, exhaust pipe, cables and clamps, pedal chain, pedal crank bending, carburetor and a host of small things that should go fairly quickly.
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  #14  
Old 07-04-2015, 06:11 PM
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scratchbuilder scratchbuilder is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Hey guys i've seen racing karts with the slanted briggs before, what is gained by the slant? I'm looking for a old briggs 2.5 or 3. hp. I've got a 79 pred but the thing is sooo noisey i cant appreciate it. Looking forward to new pics. Thx.
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  #15  
Old 07-04-2015, 09:15 PM
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maniac57 maniac57 is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Mounting concerns or possibly better oiling on the cam (I'm not convinced it does diddly but that's the answer I got from a couple racers)
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  #16  
Old 07-05-2015, 08:48 AM
curtisfox curtisfox is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Man this is looking good, sure don't take you long when you have built a couple before.LOL.........Curt
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  #17  
Old 07-05-2015, 09:59 AM
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silverbear silverbear is offline
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Default Re: Chris's Briggs And Stratton Bike Build

That's going to be a great bike!
SB
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  #18  
Old 07-05-2015, 10:47 AM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Quote:
Originally Posted by scratchbuilder View Post
Hey guys i've seen racing karts with the slanted briggs before, what is gained by the slant? I'm looking for a old briggs 2.5 or 3. hp. I've got a 79 pred but the thing is sooo noisey i cant appreciate it. Looking forward to new pics. Thx.
25 years or so ago when I built my first Briggs bike the 5hp motor wouldn't fit upright without modifying the frame. Besides, I was making a Whizzer copy and liked the look of the tilted cylinder. It provided a snug mounting with room in the rear for intake and exhaust tubes as well as double pulley assembly pivot. Building it on a bet with my friends, I expected it to over heat and seize up with lack of cooling shrouds, flywheel fan, shaved cylinder and oil. Then I was going to scrap it and get back to real Whizzers.
Instead, it ran nice and cool with plenty of oil splash and more power.
Briggs engineered their motors with overkill fins and oiling. They knew the neglect they had to endure with the owners never cleaning the grass and mud from the cooling fins or ever changing the oil. So half the fin cooling area and plenty of oil and they last a long time.


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  #19  
Old 07-05-2015, 11:06 AM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

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Originally Posted by curtisfox View Post
Man this is looking good, sure don't take you long when you have built a couple before.LOL.........Curt
Thanks Curt. I've built 6 or 7 of this type over the years so subtle changes come fairly easy. I may change my design for an older look on some future projects, but I have at leas 3 more like this to complete first.













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  #20  
Old 07-05-2015, 11:09 AM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Quote:
Originally Posted by MEASURE TWICE View Post
I'd think maybe out there is a type that may not need the pedal starting feature of the clutch that could be cheaper than Ebay 175 plus shipping from Taiwan, but use a static jackshaft? I'll look around. Thanks!
To me, after riding Whizzers, the pedal start feature was a major requirement. I don't like the look of a recoil starter or carrying a rope.
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