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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 02-26-2016, 07:26 PM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Nice, the carburetor you have with that elbow makes it fit in the frame as is!

Same engine or very similar Briggs. I have 80202 0430 3hp. Another am not yet figured how I may use is a 3.5 Briggs. I was going to swap it into the build I already have but the cranks shaft size and length has me doing some creative thinking if it will ever happen.

The cranks opening on my bike I never bothered doing anything as nice as the way you used the pedal crank part of the frame. I just covered it over with weld metal plate to keep dry. I have a California Off Highway registration. No pedals are OK for it. Not for on the streets though, trails where allowed by Fed, State, County and Private Lands.

Last edited by MEASURE TWICE; 02-26-2016 at 07:28 PM.
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  #12  
Old 02-26-2016, 07:57 PM
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cannonball2 cannonball2 is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

MT

The first motorized bicycle I built probably 30yrs back was very similar to this. It reduced through the bottom bracket but was belt on the primary side and chain on the other. It was powered by a 3hp Tecumseh. Was a good ride. Ga dropped the pedal requirement to allow the 50cc
scooters on the road.
The cops down here are pretty cool and generally if you are behaving pretty much ignore home built two wheelers. Used to see a guy all over town right in the middle of traffic on an old mini bike.
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  #13  
Old 02-26-2016, 08:13 PM
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cannonball2 cannonball2 is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Quote:
Originally Posted by scratchbuilder View Post
Your engine looks like mine did in the beginning!! I like your creative thinking. If its layin around...its like umm if I do this, I can use that. Hey I've read some of your elec. build threads, and was wondering if you know how useful are unite motors. I clean a guys shed out was there was a 500w razor, so I thinking of using it, on my cargo bike. Dang you already got your tires! Gonna be a mover!!
I assume the motor you are referring to is a brushed chain drive unit?
Whats the voltage? If it is chain drive I see no reason it wouldn't work with the right ratios. PM me or start a thread in the Ebike section.
We could use some activity down there.

Got the rear brake worked out. I like it there. Main reason its there in that position it will allow a fender to pass thru. Wouldn't at the top. I am going to run fenders on this one to make it a "proper" little Motorbikecycle. The cable will travel nicely under the engine. Will be running the super sticky clear BMX pads. Man do those things stop! Hope they are kind to the powder coated rims. The calipers just clear the tires!
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Last edited by cannonball2; 02-26-2016 at 08:16 PM.
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  #14  
Old 02-27-2016, 06:00 PM
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Nice, that bracket won't snap off under heavy braking?

What is the mod you did to the engine for the airflow?

Your info and pics got me convinced to use the CST tires on my next 4c build. I want to go with wider rims though, maybe 2.5" or 3"

Briggs builds just look right... can't wait to do another.. I'm stuck with my first 2-stroke right now..
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  #15  
Old 02-27-2016, 09:20 PM
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cannonball2 cannonball2 is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

That's a valid concern about the bracket.

When the bike comes off the stand and is dismantled for paint I have a gusset already fabbed to weld to the bottom of the bracket and the frame. That should be overkill.

The engine originally had a flat probably 2"x3" plate cast into the front of the cylinder which directed the blower forced air across the front and around the cylinder to assure adequate cooling in a stationary situation. Before removing the plate the engine looked like it was in a box with the front of the cylinder invisible. The cylinder is now out in the open.

Not all B&S engines were like that.

I'm impressed with the tires. The sides walls seem very flexible which I believe will make for a good ride. Nice on a rigid bike. The Hookworms are excellent riders.

Very nice bike in the pic! Love the stretch. Very well thought out. Pulley is killer to!

Last edited by cannonball2; 02-27-2016 at 09:23 PM.
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  #16  
Old 02-29-2016, 10:30 AM
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cannonball2 cannonball2 is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Only had this am to work on the build before I have to leave town for a bit.

Got the fuel tank mounts fabbed and welded and the bike off the stand and on two wheels.

Toying with the idea of adding pedals behind the bottom bracket. There is a coaster sprocket in the chain in the right side pic, gives the idea. Might just work with an SBP freewheel adapter, a freewheel and some fabbing. More later.
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  #17  
Old 02-29-2016, 11:38 AM
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silverbear silverbear is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

That's going to be a sweet rider. I love what you did with the bottom bracket.
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  #18  
Old 02-29-2016, 02:40 PM
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Lookin good, like the slight tilt of the engine.
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  #19  
Old 03-01-2016, 06:48 AM
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cannonball2 cannonball2 is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

Thanks Yall!

The tilt is to clear the fuel petcock/head bolt interference. Was as low as the engine could be placed. When I made the tank mounts I raised the tank a fraction and all is good now.

In order to get the engine that low had to saw the engine drain plugs off flush. Will remove, drill and tap the side cover for a drain, or possibly cross drill the lowest side cover bolt to drain when removed. Which ever is easier.
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  #20  
Old 03-01-2016, 08:05 AM
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Ludwig II Ludwig II is offline
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Default Re: Cannonball Builds a Briggs and Scrap Iron

What about a plug like this?

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