RUPP TT500 INSPIRED MOTORBIKE

[msrfan]

I built this bike about 11 years ago to race on the go kart tracks at Willow Springs, Apple Valley, Adams and Apex raceways with other motorbikes. I read about the Rupp 2 speed minibikes and wanted to duplicate the setup. I also wanted to make it a stand alone transmission that could be installed behind any engine that had the room. So I made a housing that held both keyed shafts, clutches, chains and bearings. Then I made a housing that it slips into and can be welded into whatever frame you choose. I cut the center out of my Schwinn seat post down tube and welded it onto the bike. I had to add one more chain and sprocket set to make it pedal start. When I was done it started easily and shifted nice. Sounded like a Powerglide when it shifted.

 

[msrfan]

I'm now in the process of re-doing the bike and changing the primary and final drive to belts and pulleys for less maintenance, wear and noise.

 

[Mark Brooks]

Wow the magnitude of knowledge here is incomprehensible Thank You all for allowing me to be part of this wonderful community I am truly honored to help support this site!

 

[Lizardking]

Cool beans!!! You have any video of it in action? What was your top speed and what engine did you use?

 

[msrfan]

Cool beans!!! You have any video of it in action? What was your top speed and what engine did you use?

It's a 5hp flathead Briggs, my favorite engine. I have half a dozen Briggs powered bikes I've built over the past 35 years. I had a video right after I finished it, but I'll need to make a new one when I get it all done again. I need to modify some pulleys but my lathe is down for a while.

 

[Skipp]

Man I like your work!

 

[msrfan]

Cool beans!!! You have any video of it in action? What was your top speed and what engine did you use?

I think I hit 45mph, but the altitude took a toll on my power output.

 

[msrfan]

Here's my original build thread. I may have posted it a few years ago. https://motorbicycling.com/threads/two-speed-automatic-transmission.46564/

 

[Mr. Pink]

Here's my original build thread. I may have posted it a few years ago. https://motorbicycling.com/threads/two-speed-automatic-transmission.46564/

That's some beautiful work!

 

[River Rat Ron]

Very nice bike,….reminds me of the old board racers.
Have to admit wrapping my head around the trans function had me scratching my head.

One way bearings and two clutches that engage at diff. Rpm’s finally clicked ….pardon the pun.
I regret not learning metal lathes, cnc mills etc…love to learn now but no more than I need them I can’t justify the cost.

 

[Ginz61]

Truly impressive work and engineering. The collective talent on this site is amazing and that’s an understatement.

 

[msrfan]

Very nice bike,….reminds me of the old board racers.
Have to admit wrapping my head around the trans function had me scratching my head.

One way bearings and two clutches that engage at diff. Rpm’s finally clicked ….pardon the pun.
I regret not learning metal lathes, cnc mills etc…love to learn now but no more than I need them I can’t justify the cost.

Well I'm no machinist but learned to make simple stuff.

 

[msrfan]

Truly impressive work and engineering. The collective talent on this site is amazing and that’s an understatement.

Thanks, it's a fun project.

 

[msrfan]

That's some beautiful work!

Thank you.