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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 07-14-2016, 12:54 AM
FFV8 FFV8 is offline
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Join Date: Oct 2013
Location: Spring Valley NV
Posts: 552
Default Re: 79cc Sportsman Flyer build

Any of the PZ19 clones will fit that flange.

If you search for an XR75 carb on e-bay you will find some under 20 bucks.

Jetting on those is usually close out of the box. we have used several of them.
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  #12  
Old 07-14-2016, 07:46 PM
Tom from Rubicon Tom from Rubicon is offline
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Join Date: Apr 2016
Location: Rubicon, Wisconsin
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Default Re: 79cc Sportsman Flyer build

Thanks FFV8,
Looking foreword to a three day weekend because we do a 4 day 40.
I appreciate the advice. Thanks again.
Tom from Rubicon, WI
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  #13  
Old 07-15-2016, 09:45 AM
Tom from Rubicon Tom from Rubicon is offline
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Location: Rubicon, Wisconsin
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Default Re: 79cc Sportsman Flyer build

Purchased a PZ19 + air filter and fuel filter, $21.00 shipping included. Rainy day here, so the Flyer will get my full attention.
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  #14  
Old 08-07-2016, 10:59 AM
Tom from Rubicon Tom from Rubicon is offline
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Location: Rubicon, Wisconsin
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Default Re: 79cc Sportsman Flyer build

I got in touch with Pat Dolan of Sportsman Flyer this week and had him invoice me for his excellent 79cc Predator Engine Mount System. I also ordered his tank graphics.
The engine mount will get this build going. With the engine mounted it will allow me to set up the rest of the drive train and hope I get no surprises.
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  #15  
Old 08-12-2016, 10:44 PM
Tom from Rubicon Tom from Rubicon is offline
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Join Date: Apr 2016
Location: Rubicon, Wisconsin
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Default Re: 79cc Sportsman Flyer build

Another "What the heck " today. After pulling 6 hrs overtime came home, tapped out the head bearing cups in the Worksman Drop loop frame and intended to install the Monark supplied bearing cups. Nope. Monark bearing cups are 1/32" or .75mm smaller on the OD ( 1.312 VS 1.281 ) than presses into the head. I knew from the start that challenges would arise.
But this is stupid. It seems my only logical recourse is to machine custom bearing cups that accept Monark bearing and press fit into the Worksman frame head. Producing a tubular shim for the Monark bearing cups even though my machinery could do it. I don't have the steel which would have to be 4140 pre hard to withstand the turning forces 1.312" min. OD 1.281 Max. ID. There are enough challenges in this build.
I told my wife " This is the year to string Christmas lights on the bike tree.
Give you one guess how that went over.
All for now stay busy.
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  #16  
Old 08-12-2016, 11:06 PM
Tom from Rubicon Tom from Rubicon is offline
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Location: Rubicon, Wisconsin
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Default Re: 79cc Sportsman Flyer build

Here is another thing, Be careful what you want. Do not exceed your capability's unless you have a good machine shop accessible. I own one and a good one at that.
Having performed work in trade for goods with CostomMotoredBicycles.com I was offered a laced free wheel with disc brake threaded mounting holes which was a return. ( Broken Screw ).
Today I made a setup in the Bridgeport, the rim supported by blocks on either side of the mill vise. I had the freewheel sprocket against the mill vise jaw so it would not change position. Setup complete, all six holes redrilled and rethreaded
1/4=28 NF thread which for it's size I think superior to 6mm x 1.
There is more to this story, but I have been up since 3 AM. I'm running out of gas.
Tom from Rubicon
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  #17  
Old 08-18-2016, 02:07 PM
Springfieldscooter's Avatar
Springfieldscooter Springfieldscooter is offline
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Join Date: Aug 2011
Location: Springfield IL.
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Default Re: 79cc Sportsman Flyer build

Keep us posted Tom!
Photos would be great!
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  #18  
Old 09-08-2016, 07:31 PM
Tom from Rubicon Tom from Rubicon is offline
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Default Re: 79cc Sportsman Flyer build

A package from Sportsman Flyer arrived today. The engine mount system, full head bearing set for the Worksman frame, and a set of tank logos in gold and black.
Springfield, I apologize for the lack of photos. I have been on this forum for a while and have yet to master photo additions. There is more to share, as making a adapter plate for a free wheel dick brake hole pattern to mount a 56 tooth drive sprocket. Hang in there.
This build is about to get into gear.
Tom from Rubicon
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  #19  
Old 09-09-2016, 08:19 PM
Tom from Rubicon Tom from Rubicon is offline
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Default Re: 79cc Sportsman Flyer build

Sent to Pat today.
Dear Pat,
Your package arrived Thursday.
Better than Christmas, I got what I wanted.
The quality of the Engine Mount System exceeds my expectations.
Came home from work today and installed the system in my frame in 10 min..
Only thing I did extra was brake and polish the inside corners of the clamp straps.
No scratches.
The top engine mount….first class engineering and execution!
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  #20  
Old 09-11-2016, 12:44 PM
Tom from Rubicon Tom from Rubicon is offline
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Default Re: 79cc Sportsman Flyer build

Mounting the engine is super simple,
1. Unbolt engine bracket from cradle.
2. Screw 4, 8mm bolts thru bracket into engine block
3. Replace engine bracket in cradle and refasten.
Done.

DSCN0683.JPG

Last edited by Tom from Rubicon; 09-11-2016 at 12:50 PM. Reason: wrong link
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