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1974 Yamaha TY175 Ryobi V6 Electric Conversion


I wanted an electric trials bike I could ride in my back yard, so when a stripped 1974 Yamaha TY175 Trials bike that had been underwater during Hurricane Katrina came up for sale, I made it the donor bike for an electric conversion. I made the seat from glued wood strips, and the “tank” from laminated cedar fence pickets. My Ryobi bandsaw, sander and drill got involved. A electric motor from a lawn mower replaced the crankshaft in a DT175 engine, driving through the original clutch and six speed gearbox. I’m using six Ryobi Lithium ONE+ P108 batteries, which all plug into six modified Ryobi ONE+ flashlight bodies, currently running in a 36 volt configuration. I use six 30 Minute ONE+ chargers from which I can recharge in less than an hour. Range is about 10 miles, and top speed ~25 mph. The bikes initial Trials competition was in Luckenbach, Texas for the AMA Texas Pro/AM Moto Trials on May 20, 2017. I came in second. I have found the batteries to be extremely reliable, providing you limit the output current to less than 40amps per pack. My “A” set of batteries has been in service since November 2014, with over 200 charge/discharge cycles. The weak link in the bike performance has been the brushed motor. I plan to replace it with a brushless one, and am looking for more battery capacity. Besides woodworking skills, I had to teach my self TIG welding, metal lathe and milling.

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Comments (3)

  • This is so cool! Such a creative build. You've combined the best of recycling, engineering and carpentry. Impressive work.

    By ChefEvans

  • Nice job on the conversion. I competed in local trials in the late 1970s on a Bultaco and had a lot of fun. Good luck on your new adventure with a brushless motor. It should help in overall performance. I am looking forward to seeing more about this.

    By idahodale_273628

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