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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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  #1  
Old 06-15-2015, 05:22 PM
msrfan msrfan is offline
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Default Chris's Briggs And Stratton Bike Build

My grandson and I started building this bike a while back and it got stalled a little. I sold his friend Chris (who owns an off road shop in La Habra) a Schwinn cruiser I found for him at the LB swap. Then he bought a motor and moped fuel tank from me. We kind of put it aside until Chris came up with a large compressor to trade me for the finished bike. Now we're full speed ahead.











When I say "finished" what i mean is he'll get a running pre-assembly ready for him to paint and detail to his own taste. Of course they usually get ridden for a year or so before that.
As you can see, it's pretty much my standard design with some different engineered things. Like the clutch holder is a lot more substantial.
The cutaway side cover is to aid in the installation of the compression release.
It has a dirt bike front drum brake in moped forks and a moped rear drum and Whizzer pulley. I made a top tripple tree plate to accomodate double bar clamps.
I made the laid back seat like I did on Bill's Whizzer. It's a standard Messinger vinyl with adjustable springs.

That's what I have for now. More to follow soon.
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Old 06-16-2015, 03:21 PM
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Tony01 Tony01 is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Nice! Is that a Chicago Schwinn? Has the flowing connections from the headtube.

Hey I have a question for you. Are all these Schwinn cruisers the same size? If I redo my motor mount will I be able to fit a 5hp as well? The way mine is right now, I have to really massage it in there to get it in with the spark plug boot on. And taking the boot/plug off is difficult with those seat stays near the head.

And where do you find these great moped forks? Do they all have a 1" steer tube? Everything that is dual crown suspension type out there for downhill MTBs is very expensive, and I'm trying to find some front suspension that looks good for less than $100.. and not having the lateral flex of a Schwinn springer.
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Old 06-16-2015, 10:26 PM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Yes, it's a 70's Chicago Schwinn middleweight. As far as I know, all the cantilever frames of that era are the same dimensions. The later frames with the welded neck may be different. We've got Myron's Mopeds here in Fullerton for forks. I've found most have a 1'' or 25mm posts. With careful cup, cone and bearing combinations you can make them fit nicely. Placing the 5hp motor in the frame is critical so you have enough room for the spark plug. Which also leaves enough room for the drain plug. May have to offset it to the right more than you originally planned.
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Old 06-17-2015, 02:42 AM
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silverbear silverbear is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Signing on to this thread. I remember the first of your Briggs builds here on the forum. For me it was love at first sight and the use of moped parts (forks and drums) has become standard for me thanks to you. After seeing examples of your Briggs builds and ones by others who were much influenced by your work I wanted to do my own. The "kindalikeawhizzer" build is as close as I will come even though the engine is Tecumseh rather than Briggs... close enough though in size, displacement (199CC) and horsepower (also 5 hsp) to be a close relative. Many thanks to you for sharing your creative energy with the rest of us.

Chris's bike is already a winner even without detailing and paint. I bet he's happy...

SB
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  #5  
Old 06-17-2015, 06:25 PM
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Gbrebes Gbrebes is offline
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Default Re: Chris's Briggs And Stratton Bike Build

Cool bike. Very nice looking compressor, should have all the capacity you would ever need.
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Old 06-17-2015, 09:37 PM
dtv5403 dtv5403 is offline
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Default Re: Chris's Briggs And Stratton Bike Build

my wheel and fork combo is very similar to yours, dirt bike drum in front and moped hub in rear, but I'm running k10 forks and 24" rims with 11g spokes. What size spokes are you running?
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Old 06-19-2015, 11:03 PM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

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Originally Posted by Gbrebes View Post
Cool bike. Very nice looking compressor, should have all the capacity you would ever need.
Thanks Gilbert. I hope to get a blast cabinet soon.
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  #8  
Old 06-19-2015, 11:07 PM
msrfan msrfan is offline
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Default Re: Chris's Briggs And Stratton Bike Build

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Originally Posted by dtv5403 View Post
my wheel and fork combo is very similar to yours, dirt bike drum in front and moped hub in rear, but I'm running k10 forks and 24" rims with 11g spokes. What size spokes are you running?
They're 12 ga.
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  #9  
Old 06-22-2015, 01:23 AM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Chris's Briggs And Stratton Bike Build

The clutch that does not go on the engine crankshaft I am curious about. I can see alignment is solved with the jackshaft/clutch arrangement if you call it that, but one question I have to ask.

My bike I got another engine that is newer an 1/2 hp more to swap in, but I have a problem. I was thinking of possibly using a different engine that has too short a crankshaft for the belt clutch I have. I have looked to buy used crankshaft to fit, but very difficult to find cheap and get all the right spec to match.

So the other route was to look sort of like what you have. The pulley on the engine crank uses the 1.3 inch length no problem. So here is what I thought I'd try. I put the belt clutch on the jackshaft. Then I realized that the type of clutch uses a live (moving) crankshaft or in this case live jackshaft.

I could do this, but finding room to place another pulley on the jackshaft and also the belt clutch too, I would have to change stuff around to make room.

How is this clutch you use have all in one; a way for pulley as input and pulley as output? Is it on a static (non-moving) jackshaft?

Oh and yea looks like a powerful beast your and friends build!

https://vimeo.com/130158715 My time before last outing with the 3hp Briggs Bike (maybe to be 3.5).

Last edited by MEASURE TWICE; 06-22-2015 at 01:34 AM.
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  #10  
Old 06-22-2015, 05:22 AM
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Ludwig II Ludwig II is offline
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Default Re: Chris's Briggs And Stratton Bike Build

That really looks like vintage motorcycling, with a soft and low revving engine rding down a dirt road.
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