goped powerd mb friction drive

Discussion in 'Introduce Yourself' started by tom80, Jan 8, 2010.

  1. tom80

    tom80 New Member

    I have just finished first mb. powered by cy23hr 2 hp 10000, red line 12000
    friction drive. Unit I made is attached to seat post. This is a very clean install and looks like it came with bike. I basically made a go-ped that's attached to seat post. go-ped has been making friction drive scooters since 1985. My purpose for rc engine was the small size and good power also huge after-market selection of parts. I use my mountain bike for trail riding and my local park prohibits the use of motors. My build was based around good looks ease of use and quick removal for trail riding. I only have one bar from seat post to hold unit. Black motor and black cover for 1.5 liter gas tank. I made it all black so it is not so noticeable. This unit has no clutch so it works like a go-ped sport. I made a sleeve for seat post and welded square tubing to it and a box section made to hold motor and gas tank. I threw bolted sleeve on seat tube in place and installed a bolt in the down tube of bicycle. the bolt in down tube is there to stop motor twisting left to right. The seat post has a channel cut in it to allow movement up and down but not twist. I purchased the motor, gas tank, black tank cover, Third bearing support, .750 black magic spindle and mounting hardware from Dave's discount motor sports for 230.00. I bought my mountain bike ( giant yukon) two years ago for 650.00. I have bought another seat post and seat. To remove the motor all I have to do is disconnect throttle cable and release quick release and slide seat up and out. install spare seat and post and my bike is stock again except for throttle lever. This works well for bart and trail riding. I can keep motor and seat in backpack or leave at home. The black magic spindle works very well for the 1.5 tire that I run for commuting. This spindle has channels cut lengthwise and grips very well with not much pressure. I have not had any problems yet and this set up is good for 25 mph. 60 miles on 1.5 liter tank. The bracket i made was with just hand grinder hand drill sawzall and welder. I am a machinist by trade but did not use any machinery and took about 6 hours to complete mount. Mount was then coated with roll on bed liner. I will post long term use. The only problems I thing I may encounter is a bent seat post? We will see. The mount is close to the frame so hopefully it will not bend.
     

  2. RusticoRay

    RusticoRay Member

    Hi Tom80, Welcome
    Your hard work needs pics to show it off.
     
  3. tom80

    tom80 New Member

    working on pics

    I will try to get pics soon.
     
  4. tom80

    tom80 New Member

    pics of my project are in picture gallery.
     
  5. tom80

    tom80 New Member

    Its me agian. The bike runs great! average about 140 per gallon no clutch all motor. I have over 80 miles on bike just switched over to synthetic oil.top speed motor broke in 27mph still .750 spindle. Iam still running 1.5 rear tire 90 ps1 lots of grip. will keep posting pics under profile. would like to see more rc motors. The only down falls are high reving lots of power,small in size, cheap parts, big aftermarket, 25:1 fuel ratio, race engines have low reliability but make great hp(14000 - 17000).Good things! been around since 1985. strong parts and made for high revs. if you like friction drive you will love goped parts. I need more back up on rc motors. . my mb rides great. please check out my commuter. speelling sucks had some drinks.
     
  6. RusticoRay

    RusticoRay Member

    Very interesting tom80,
    Excellent looking bike, very creative. Many second chance go-peds lying around. Does it climb with that.750 spindle? I like the idea of switching it to regular bike quickly with little effort.
     
  7. tom80

    tom80 New Member

    It will climb most hills no problem. The steep hills require little help to maintain 25 mph.
     
  8. tom80

    tom80 New Member

    I have a .950 spindle on order for lower rpm's at 25 mph and new top speed of 33 mph. I am going to also order a juice for the intake track ( boost bottle). I have spring loaded my seat post tube so when i stand up it disengages the motor for down hill. I can easily lock seat post up or down while riding with quick release for seat. Also will install kill switch on handle bars for convenience.
     
  9. tom80

    tom80 New Member

    I have installed The .950 spindle. Top speed is only 27 mph due to not enough hp at high rpm. Time for performance parts.
     
  10. Happy Valley

    Happy Valley Active Member

    Hello and welcome to MBc.
    I just looked at your project and I like it! Simple, light and unobtrusive plus easy to convert back impacting the original bike little, if at all. Good bit of innovating there.

    I wouldn't see a problem with the bending of a seatpost but vibration over time can create havock with metal fatigue at the seat tube top, particularly in aluminum.
    Not saying it's inevitable.....just saying I've seen it happen. I saw your comment on monitoring long term results so I'm sure you'll be on top of it.

    Also, from the pics it looks like it uses a centri clutch, is that right?
     
  11. tom80

    tom80 New Member

    I have installed hp walbro 813 carb with H and L settings and accelerator pump , velocity stack and high flow filter. My motor has 2.5 hp now and redlines at 14000 rpm. When a rc motor is tuned for top end power the bottom end tends to suffer. The accelerator pump allows engine to recover faster when on and off the gas. I need no choke for cold starts because of accelerator pump. To start bike tap gas couple times and peddle ( direct friction drive no clutch) to start engine. Ride slow for about 10 seconds to let motor warm up and I am good to go. After a long ride I just ride slow to allow motor to cool. I am going to delete my pull starter since I do not use it and replace it with a air scoop ( probably a wast of money but it will look cool ). This Mb is cruising at 30 mph now with a .750 spindle. I am going to port the head and change exhaust hope to get about 3.5 hp.
     
  12. tom80

    tom80 New Member

    My new project is done. BMX friction drive no choke, pull start or kill switch. Just get on and ride. I bought the bike from Toys " R " Us for $150.00. It is the least expensive bike I found with 48 spokes steel frame and a long top tube. I changed tires to a street tire that could hold 90 psi. Stock tires are to soft for friction drive. This bike rides better than my mountain bike mb. It just feels more solid and smooth. Bike is 41 lbs with l.5 liter of fuel. Surprisingly it feels very light with the motor powering it. I can easily jump curbs and street islands. brakes are next on list.
     
  13. rm26x

    rm26x New Member

    man very cool. I am working on the same project right now. Have a Zenoah G26 that I am going to use, has a clutch. Going to order an aftermarket goped friction setup for it and make a seat post mount like yours. Thats the part that was holding me up, couldn't think of a clean way to mount it. My GT hardtail I am using with 1.5 street tires doesn't have any rack mount tabs or anything, and is an aluminum frame. The seat post mount is the perfect answer. Should have it going for ~$100
     
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