ryobi friction drive

Discussion in 'Friction Drive' started by bikerdude0269, May 16, 2011.

  1. bikerdude0269

    bikerdude0269 New Member

    I hope im putting this n da right thread. Ive been lurkin for awile now and researching this. Ibought a occ chopper for my friction drive. I have come accross a ryobi 31cc weed whacker for sale. My plan is to put it like this picture courtesy of who idk whose pic this is but this is how i plan to mount the 31cc ryobi... If any body has n e suggestions i am open to them. My only means of transport now gets 9 mpg kills me.

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    Uploaded with ImageShack.us


    this is my bike now below

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    Last edited: May 16, 2011

  2. SimpleSimon

    SimpleSimon Active Member

    Can I ask why you have chosen friction drive?

    This is NOT meant negatively at all, but power loss through a friction drive spindle is higher than almost any other system, and the 31 cc Ryobi is a marginal engine for the application in power terms.

    Now, don't get me wrong, I'm not saying don't do it. As a "power assist" system it will be a noticeable help, but you won't be climbing any significant grades under primarily engine power. Well, maybe, if you are a little guy.
     
  3. bikerdude0269

    bikerdude0269 New Member

    Ez, reliable, cheap build. I live n nc n da flats.Hardly no hills that magnitude u r refering to i believe. Plus I have weed eater genious buddy that can get more than 31cc outta the ryobi. He was born with small engine spoon in his mouth. Maybe later when I can afford a motor kit I will upgrade. Plus im financial strapped right now. This is with in my budget!
     
  4. cpuaid

    cpuaid Member

    That's exactly why I chose friction drive as my main commuter bike. It's reliability and ease of repair is unsurpassed. I am an urban rider and the #1 issue I face is tire punctures. When you ride on the side of the road, you encounter many things that is swept aside by the street sweeper that can give you a flat where tire slime will not even work. I can honestly change out a flat in 5 minutes flat on my friction drive bike. My China girl bike looks cool but couldn't handle my 22+ mile daily commutes. That thing would frequently break down along the way. When it broke down it was harder than heck to peddle unless I removed the drive chain. Those of you who disagree haven't had to peddle the darn thing for 11 miles over multiple hills! My Gebe is a great commuter unless the belt gets hot and stretches. Here in Texas you go all summer over 100° F. My stretched belt makes my tension pulley bounce back and forth so quickly and often that riding it is unbearable. I go through a new belt every year. With my friction drive I know it will start up EVERY time on the first or second pull. I know that if something goes wrong I can lift up the engine mount and have NO drag at all when I peddle. I know that if I get a flat all I have to do is quick release the axle and brake cable ( a whole 30 seconds process) and change out the tube. I know I can get almost 35 mile range on my stock little tank. I can swap out engines in 5 minutes if I get bored. (I have 4 different size engines that I rotate depending on my mood!). In my personal experience, friction drive setup wins for reliable daily commutes. Power loss? I don't think so. Chain drive 66cc China girl with stock setup can barely hit 30 MPH and get 80 MPG average. My 35cc Robin can almost hit 30 MPH and get 180-200 MPG. Friction drive is cheaper to maintain. With my China Girl I bought a new clutch, new magneto, new twist throttle, new head gasket, upgraded the carb, new smaller sprocket, and new muffler. I wasted so much money on that thing it was ridiculous and It still breaks down. None of my friction drive engines have broken down on me or left me stranded yet. I had to spend a whole $15 on a new rear tire this year after maybe 500 miles of hard commuting. Biker dude. There are several choppers on Youtube that has friction drive setups. I think it's only a matter of welding on a support bracket of some kind and a support brace that enables the engine to slide back and forth and lock against the tire and a cheap goped spindle for $10. You can't get any cheaper form of motorized bike than that.
     
    Last edited by a moderator: Dec 18, 2015
  5. Wheres my dog

    Wheres my dog Banned

    I say hit up da friend with da small engine spoon in his mouth and git u sum help an build da bike rite and hit us up here wit da pics

    How exactly do you get more then 31cc from a 31cc engine???
     
  6. SimpleSimon

    SimpleSimon Active Member

    Fair enough, cpuaid. You are an experienced rider with all of the major choices available in this hobby, and I'll not question your experience.

    I will say that I guess I got lucky - with my HT engine set up in the trike conversion I built I went through the engine thoroughly before I ever tried to turn it over - replaced all of the studs and bolts with grade 8 material, replaced the plug with a quality plug, polished the ports, etc. Even though that was a fairly complex install, with seven sprockets and 5 chain loops, a jackshaft to bring the power and the pedal loops together, and a Shimano three speed internally geared hub as a mid-drive transmission, once dialed in I had essentially no trouble with it. I am uninterested in speeds much over 20-22 mph, and in 3rd gear on the Shimano it would hit 35 - mostly I never got to third gear. Still, it averaged 140 mpg with my heavy behind and the weight of the rig itself to push. I miss that darned thing.

    My current build project is severely delayed by health issues, but I hope to finish it soon. Which is a rear suspension GEBE rig with an RS 35 4 stroke pushing a tadpole trike I am building.
     
  7. rustycase

    rustycase Banned

    REALLY sounds like that's gonna be a FUN tadpole, SS !!!
    rc
     
  8. bikerdude0269

    bikerdude0269 New Member

    have no idea how he does it. he just does it been around small engines since he was born. ive seen him get a 50cc scoooter run 60 plus with the right tweask and parts idk how he does just does...
     
  9. bikerdude0269

    bikerdude0269 New Member

    im preety sure im going with the polyurethane boat thign that the boats roll up on the trailer that i seen somebody on here have for a spindle. if not i have multiple trick bmx pegs.
     
    Last edited by a moderator: Dec 18, 2015
  10. cpuaid

    cpuaid Member

    That polyurethane roller had been tried on BMP friction drive kits and then discontinued. It had a bad habit of premature wear so you're long term cost on them will be higher. I forgot you wanted to go the cheapest route so a bike peg spindle should work fine for you. That little Ryobi should get you going at least 20-25 MPH stock with the right spindle size. If you can get a hold of a Goped black diamond spindle I'd recommend you buy it. I got mine for $15 shipped and that darn thing is well worth it. Faster take off speeds and you can ride on wet streets. Keep us posted and good luck on your build.
     
  11. bikerdude0269

    bikerdude0269 New Member

    k i will keep my out for one. were did ya order urs from?
     
  12. cpuaid

    cpuaid Member

    There was a guy selling them on ebay but it looks like he's sold out. It was $13.50 shipped. The title of his posting was "Goped Sport,Goped Bigfoot, Black Diamond Type Spindle". gopeddepot up in florida has them from $20 - $25 + shipping depending on the size. It's the black magic type. Hope this helps!
     
  13. bigkahuna

    bigkahuna Member

    I've got a 29" wheel cruiser ( http://www.walmart.com/ip/Genesis-Onyx-29-Cruiser-Bicycle/16203481 ) that I want to motorize. I originally considered an in frame build but after reading all the threads about broken this and that I'm thinking about a rear friction drive instead. I hope you don't mind but I've got a couple questions: First, what kits do you recommend I look at (since I've got 29" wheels) and second, do any of the kits have the motor centered above the wheel rather than off to the side? Thanks! :)
     
  14. bikerdude0269

    bikerdude0269 New Member

    yes helps lots point me in the right direction. thanks
     
  15. rawly old

    rawly old Member

    Bikerdude,
    The problem I see with that mount on that bike is heel strike if
    you need to pedal... of course I have size 14 feet. A properly
    broken in ryobi is actually a pretty reliable engine, but with 31cc's,
    I think you're gonna have power issues unless you're built like a
    jockey and live in Kansas.
     
  16. rawly old

    rawly old Member

    Big Kahuna,
    If you're looking for a drive centered over the wheel, you
    may have to build it yourself. I know the Russians and a couple
    other eastern European countrys make such kits, but there's
    a snoball's chance in **** of importing one. Still, if you hunt thru
    the foreign videos there's a wealth of configurations out there
    for ideas, some really cool stuff.
     
  17. wheelbender6

    wheelbender6 Well-Known Member

    I think a chopper like that is a good choice for friction drive with that fat rear tire, but I have no friction drive experience. I had been looking for this post. When I first saw it, I was on my smart phone and didn't remember that it had Ryobi in the title.
     
    Last edited: May 22, 2011
  18. SimpleSimon

    SimpleSimon Active Member

    Here ya go, two speeds shift-on-the-fly friction drive

    The engine mounts to the top plate, the ears hold the pivot pin for the U channel, the blue cylinder represents a spring to push the front end down and press the front roller to the tire, or compreesed by the cable, lifting the front roller and pressing the back roller to the tire.
     

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  19. bigkahuna

    bigkahuna Member

    Thanks. I decided that wasn't going to happen so am looking at getting the lightest weight per highest shaft power I can find. At the moment I'm looking at DAX's 6.5 lbs 47cc motor. It's so small and lightweight, that I doubt I'll even notice that it's not centered on the bike. I plan on using a tear drop gas tank so all the weight isn't above the rear wheel but is still higher than the motor for gravity feed.
     
  20. cpuaid

    cpuaid Member

    bigkahuna.... I've been eyeballing that same little Dax 6.5 lb. engine. Keep us posted on how well it performs. My only concern was on the sound level. Chinese 2-strokes are notorious for being much louder than their Japanese counterpart in the stock configuration. Good luck on your build.
     
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