4-stroke bike project

Discussion in '4-Stroke Engines' started by Irish John, Feb 29, 2008.

  1. Irish John

    Irish John Guest

    This is my first attempt to start my own thread. I'll stop now and go and see whether this is on my new thread. This is about my new Schwinn Cruiser 4-stroke motorised bike which I am going to spend a lot of time perfecting so it goes fast and quiet and looks utterly beautiful. With other members help I have every confidence I shall succeed. Now I'm off to sleep and dream about my project.
    Irish John
     
    Last edited by a moderator: Mar 1, 2008

  2. kerf

    kerf Guest

    Welcome to the forum, what drive unit are you using?
     
  3. Irish John

    Irish John Guest

    Still undecided but someone mentioned a horizontal Honda and gearbox yesterday.
    I just want the absolute best in terms of power and reliability. I want it to cruise at 30 mph with lots of extra left so it's not revving too high. I want it to be quiet with a full length exhause that looks just right. I want it to be economical on fuel and to be environmentally sensitive. Basically I want everything. It has to freewheel if the engine or chain locks up. It needs to be pedalled easily without the engine so if it conks out I can ride it home etc. It can only be frame mounted cos I carry stuff in my paniers and I don't want a Chinese engine although a Grubee kit has a tray I could use. Those grubee chain tensioners are chinese though and useless. Pity Ducati don't make a little V twin for a bike!
    Ducati do make bicycles now though. With Bianchi they released the Ducati Corse range of bikes.
     
    Last edited by a moderator: Feb 29, 2008
  4. graucho

    graucho Active Member

    Welcome to MBc ! Home of may answers, and awaiting your ideas.
     
  5. mickey

    mickey Guest

    The Honda and Honda-clone Lifan horizontal singles are sweet, proven, tech. My issue with using one on a bicycle frame is that you will definitely be a motorcycle rather than a moped or motored bike. The frame would have to be beefy, or a custom build, the running gear likewise and the weight will just add up. I think that even the 50cc Honda weighs in at 35-40 lbs by itself. Before I went that route, I'd just buy a Sachs Madass for the street, or something like this, or this slightly cheaper version, for offroad
     
    Last edited by a moderator: Feb 29, 2008
  6. Irish John

    Irish John Guest

    My new Bike for the project

    Got my new bike today for the 4-stroke project. It is almost identical to the Schwinn Tango Tandem I bought last week. See attached picture. I suppose I'll need wide cranks to get around the centrifugal clutch etc.
    I'm going to try and build a reliable, powerful, quiet 4-stroke V-mounted rig for serious cycling. I'm not interested in the motorbikes mentioned above but thanks anyway.
    What is a horizontal Honda? i.e. what is its proper name. Is it the Honda GXH50cc?
    Who can help me with gearboxes and who can help me to avoid using any chinese parts although the Grubee "steamline" pipe is the sort I want. Presumably they meant to write streamline unless it is for a steam powered motor!
    I'm on my way - the bike is in the workshop and I'm ready to begin.
    All advice will be gratefully received but I'm building a motorised bike with a frame mounted 4-stroke engine. That is my goal. The Sachs engine is not a consideration. Too slow and not v-mounted. I've already tried one. Likewise with all the Chinese 2-strokes.
     

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    Last edited by a moderator: Mar 1, 2008
  7. mickey

    mickey Guest

    My bad, When you mentioned Honda, gears, and single in the same sentence, I thought you were talking about this type of thing. The GXH50cc etc are single gear industrial engines, rather than motorcycle engines per se.
     
  8. Irish John

    Irish John Guest

    Horizontals

    Where can I find out about the Lifan? Is it from China? What engine size is the horizontal single? Who makes gearboxes in USA for what I'm looking for?
    Irish John

     
  9. Irish John

    Irish John Guest

    Single geared

    Thanks Mickey, I Don't think a single geared rig will cut the mustard. Too much revs at top speed. That's one of my beefs with the big Chinese 2-strokes. If they had gears they wouldn't have to howl along at top revs all the time until the bearings fail. I saw some NuVinci gear & chain rig recently. Do you know anything about these? I just noticed the link in your message - very interesting. Thanks so much. I'll go back and look at that now.
     
    Last edited by a moderator: Mar 1, 2008
  10. mickey

    mickey Guest

    Alas, no. Too spendy for my meager budget. But there is quite a bit of work being reported with them on this forum. Zombiebuilder has a couple of projects going. Other forum members are experimenting also. A search on NuVinci will show them.

    I have, and am constantly rebuilding, a series of the little Honda motorcycles (CT70 C70 etc) and have replaced the Honda motors with the Lifan clones similar to those on the Hooper link I posted. They are Chinese built but seem to be up to western standards of quality, though not the old Honda standard. I think, but don't hold me to it, that they also make a version of the industrial type engines that most people are using in 4stroke projects. Google around.

    Mickey
     
    Last edited by a moderator: Mar 1, 2008
  11. kerf

    kerf Guest

    Staton can supply you the multi speed (Nuvinci) GXH50 unit but it's a rack mount. You could frame mount it, with a modified frame but the peddle crank would need to be three feet wide. I think with your list of demands, a Tomos would be a reasonable investment.
     
  12. Irish John

    Irish John Guest

    Thanks, What is a Tomos and where can I find out about them?
     
  13. kerf

    kerf Guest

    Moped, type Tomos into your search engine.
     
  14. fetor56

    fetor56 Guest

    I've just recieved 2 Honda GXH50-QXA and 1 Subaru EHO35 from Staton and they arrived in perfect condition....David at Staton put all 3 engines in one box to reduce freight costs and did something else but i can't say for legal reasons.The price was approx half of what u would pay in Oz.If u go the way of the Honda(either QHA-QXA)
    you'll need to disconnect the governor........."made in japan"...it's worth it.
    http://www.motoredbikes.com/showthread.php?t=8310&highlight=governor
     
  15. Irish John

    Irish John Guest

    Grubee 4-strokes

    I'm thinking I'll have to get a Grubee 4-stroke kit that can take the Honda engine but I don't think I can get gears for this sort of rig. Has anyone heard of a v-mounted 4-stroke that has gears? I've only heard of rear rack-mounted 4-strokes with gears. Don't think I can get a Grubee in Australia anyway. I'd have to ship it from the US.
     
  16. fetor56

    fetor56 Guest

    My guess is u probably won't get it in Oz.I might be in the same sitiation as u IF the new Dax 4-stroke rear mounting kit doesn't fulfill my needs.I've received the GXH50 engine from the USA and if things don't work out i'll do a frame mount with the Grubee.I called MBB Imports(32 Paradise Close Plumpton Sydney,Australia ph.# 040 524 5430) about 3 mths ago and they said Grubee kits would be available in 3 mths so now would be the time to try if your interested.You know these Australians though...incredibly slack.
     
  17. Irish John

    Irish John Guest

    Hi guys

    Hi, I've started a new thread for my 4-stroke project and am looking for advice. Think I'll get the Grubee kit and use a Honda 50 motor but I want gears if poss. I've got the bike, a Schwinn Alloy seven cruiser and am putting a 66cc 2-stroke in it as a temporary measure until I work out the 4-stroke rig to use. Also have a Merida Kalahari with a 66cc 2-stroke and am putting an engine in a Giant Cypress which has 700C wheels so that should go faster at lower revs. It's not quite finished so I'll wait and see. The seat post is too wide for the engine mountings so I might have to devise something to overcome that problem. I didn't notice how wide the seatpost was until I got the bike. Anyway here's a current picture of my workshop looking very busy. More about my 4-stroke on my thread.
    Irish John
     

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    Last edited by a moderator: Mar 5, 2008
  18. Irish John

    Irish John Guest

    Grubee kits in Oz

    Called him today and guess what he said "he'll have them in 3 months time." Problem with gear box that needs ironing out he says. I think the problem is the same problem that other Australian who have attempted to import Grubees have encountered and I don't think this site is the place to discuss that problem. Anyway I live in hope. Thanks for the contact number. His website is www.mbbimports.com
     
  19. Irish John

    Irish John Guest

    Carb problem

    Just built a new 70cc 2-stroke and when I open the throttle to full on a hill the power dies off and I have to close it down a bit. How can i get full throttle to stop flooding the carb which is what I think is happening? Any help gratefully received.
    Thanks
    John
     
  20. cooltoy

    cooltoy Member

    John, Hard to help with this but are you sure it's not just a matter of the revs not being able to get up there because you are going up a hill? In order for the engine to use all the gas provided at full throttle the engine needs to rev higher but because you are going up a hill, it can't.
    That's what I notice when riding mine anyways ,kind of like when you get a chainsaw stuck in the tree and you hold the throttle full
     
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