Help in making my first build :)

Discussion in 'Photos & Bicycle Builds' started by mak_opt, May 18, 2013.

  1. mak_opt

    mak_opt New Member

    Hello Everyone,
    I am new to this forum but found it to be quite awesome.
    I am a Indian high school student from Mumbai.I would like to turn my stingray chopper styled bicycle into a motorized one due to my long commutes to school about 10 km one way.I am a complete newbie to motorized bikes and stuff but am a science student ;)
    I am unsure whether electric motor or a gas powered motor should be used :eek:
    Petrol is pretty expensive in India, about $ 1.37 per liter :(
    Please tell me how much would it cost me and will all the items required be available to me in India? :)
    Also, I am not interested in ready made kits and am into DIY :grin5:
    i don't much time only 2 weeks until my school reopens :icon_cry:
    thanks in advance,
    Murtuza Abbas :)
     
    Last edited: May 18, 2013

  2. wheelbender6

    wheelbender6 Well-Known Member

    Welcome to the forum. It would be great to just buy a nice Royal Enfield, wouldn't it? They are beyond my budget too these days. The Chinese HT 2 stroke motor is probably best for your stingray. Many members on this site have motorized stingrays and they look great. Search this site for "stingray" to see some.
    You will need to mount the the motor offset an inch or so to the left of centerline so the motor chain will clear the fat rear tire. They sell "stingray" motor mounts on EBay but you would need to see if the seller will ship to Mumbai before purchasing.
    I would not get an electric motor kit unless you only plan to ride only ten miles or so per day. It is very expensive to get more range because it will require pricey LiPo batteries.
     
    mak_opt likes this.
  3. mak_opt

    mak_opt New Member

    Hey @wheelbender6,
    Thanks for your quick reply but I would be really satisfied if you can answer the following systematically;
    1)Which engine should I use for my chopper, 2 stroke or 4 stroke and how powerful if I want it to work upto speeds of 45kmph easily but want to keep the mileage to over 125 kmpl and if not then I would like to know about electric options and I am ready to peddle along with reasonable power?;
    2)How much will the whole setup cost me?;
    3)If I wish to add extras like headlight and horn and stuff like that then how do I power them?;&
    4)Last but not the least, I want a complete easy guide for motorizing a bicycle because I am completely new to these stuff? :confused:
    Also, please tell the total list of things I need to get from the store because I can't wait to ride a motorized chopper ;)
    Thank you so much for devoting your valuable time towards my thread :)
    P.S: here are two Honda engines which I guess are fine for my purpose;
    http://engines.honda.com/models/compare/gx35,gxh50
    Please let me know if these are fine :)
    Please answer ASAP, impatient to ride a motorized chopper :D
     
    Last edited: May 19, 2013
  4. wheelbender6

    wheelbender6 Well-Known Member

    I can show you a list of things you need for your sting ray and some prices but I don't know if these companies ship to the sub-continent.
    First, I would not attempt to mount a 4 stroke motor on a Stingray (for a first time builder). They are tougher to mount and require a reduction gear box (2 stroke China girls motors have an internal reduction of 4:1). Here are some links to items you will need. I don't know if they will ship to Mumbai.
    Engine kits
    http://www.bikeberry.com/gas-engine-kits/gas-engine-kits.html
    http://www.kingsmotorbikes.com/2_stroke_bicycle_engine_kits.htm
    Stingray engine mount
    http://www.ebay.com/itm/Schwinn-OCC...077?pt=LH_DefaultDomain_0&hash=item33823776d5
    http://www.bikeberry.com/motorized-bicycle-offset-wide-frame-chopper-mount-kit.html
    You will need a second chain – kit chain not long enough for a sting ray
    http://www.kingsmotorbikes.com/Standard-410-Chain.htm
    Spring loaded chain tensioner (for the longer chain)
    http://www.ebay.com/itm/HI-PERFORMA...Cycling_Parts_Accessories&hash=item232b1ba354
    Good luck
     
    mak_opt likes this.
  5. wheelbender6

    wheelbender6 Well-Known Member

    You asked about lights too. I would go with battery powered lights that require no wiring. The LED lights are very bright and provide long battery life.
    I have run 6 volt lights from the "white wire" on my 2 stoke motor and it blew a lot of bulbs.
    I have also mounted a rechargeable 12v 5ah hobby battery on my bike to power 12v lights. Recharging the lead acid battery was very time consuming.
    I also did not like having extra wiring running along my frame. To me, keeping a set of small replacement batteries in my back pack for battery powered lights is easier than fixing a light wiring problem on the side of the road at night.
    I know that you are not interested in motorizing your stingray from a kit, but that is the only way you can come close to finishing your project in a couple of weeks. You can do non-kit motor on your stingray when you have more experience and available time. Just my opinion.
     
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  6. wheelbender6

    wheelbender6 Well-Known Member

  7. mak_opt

    mak_opt New Member

    Hey @wheelbender6,
    I am really happy with your quick replies but isn't it cheaper and better to buy a engine by myself rather than kit? :/
    Is there any better reason to choose 2-stroke over 4-stroke engines because 2-strokes are very inefficient and polluting?
    Also, how powerful engine will be sufficient, 50cc or 100cc?
    And do you have any idea on attaching a powerful horn?
    It would be fine with some more time :)
     
  8. wheelbender6

    wheelbender6 Well-Known Member

    Here is a four stroke kit that could work. You may be able to get a separate stingray 2 stroke mount plate and attach the four stroke engine mounting plate to that. No guarantees. If you simply buy a motor and no kit, you still need to buy a throttle, engine mount plate, reduction gear box, clutch, chain, sprockets, kill switch and many small items that probably will not fit together, wasting time and money.
    Four strokes pollute the air less and there is no need to mix gas and oil. If you ride every day, mixing gas and oil can become very time consuming.
    I weigh around 220 lbs and my 50cc 2 stroke engine cruises at 25mph with me. The 66/80cc 2 stroke will go faster. Most states in the US limit bicycle motor size to 50cc.
    A bicycle shop has horns. If you really need a loud one, get a motorcycle horn and power it with a rechargeable 12v 5ah SLA battery.
    http://www.bikeberry.com/gas-engine...g-pull-start-bicycle-engine-kit-4-stroke.html
     
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  9. wheelbender6

    wheelbender6 Well-Known Member

    Here is a do-it-yourself motorized stingray. It is simple and inexpensive, but it does not look very reliable or safe. His clutch is only a belt tensioner. The rider puts his foot on the pulley lever to tighten the belt enough to transfer power to the rear wheel. He must keep his foot on the pulley lever to power the rear wheel. The rear pulley, or sheave, is simply a bicycle rim attached to the rear wheel. This builder made (cut and welded) his motor mount. You may be able to adapt an existing engine mounting plate. A belt drive may slip a lot during the rainy season. Chain drive is better for a wet climate.
    http://www.motoredbikes.com/showthr...tingray-custom-build-Tecumseh-3-hp-belt-drive
     
  10. mak_opt

    mak_opt New Member

    Ohk fine I agree with you that kits are reliable and better so I am getting a kit from Dubai, how much must the kit cost?
    But, now I am confused between 2-stroke and 4-stroke engines.Will you suggest me which one to get and which type of engines has the most advantages?
    I am looking for a easy hassle-free and most importantly fuel-efficient engine(atleast over 200 MPG) for daily use.
    Is the Honda GX35 good enough according to my needs?
    How much mileage does your 50cc 2 stroke engine give?
    Also, what about brakes because ordinary brake won't work?
    Lastly, can I choose my setup to be manual or automatic transmission, and if I can which one should I choose?
    P.S:- I am ready to pedal hard if it improves my mileage, so is it possible to keep the pedals after the kit is installed?
    I am really sorry if I troubled you which I guess I did :p
    Thank you so much :)
     
    Last edited: May 20, 2013
  11. joshua97

    joshua97 Member

    do not buy a 2 stroke engine with a letter prefix in front of the name! e.g. F80 PK50 they are rubbish, get a good motor (zbox etc) and look for a bike with a thin frame both mounting tubes are same ( mounts are better if u don't have to use frame adapter) and if u want reliability look for a HD wheel so u don't bend wheels, even a sprocket adapter, or a motobecane wheel if u can't find the others
     
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  12. wheelbender6

    wheelbender6 Well-Known Member

    Ohk fine I agree with you that kits are reliable and better so I am getting a kit from Dubai, how much must the kit cost?
    A complete 4 stroke kit with a Huasheng motor costs between 300 and 400 dollars (US). Shipping will cost extra.
    But, now I am confused between 2-stroke and 4-stroke engines.Will you suggest me which one to get and which type of engines has the most advantages?
    If you can pay the price for a four stroke kit, get one. They are more convenient for daily commuting and pollute the air less.
    I am looking for a easy hassle-free and most importantly fuel-efficient engine(atleast over 200 MPG) for daily use.
    Is the Honda GX35 good enough according to my needs?
    I have heard of a few members that have had trouble with the timing belt and carburetor on the Honda GX35. The Subaru Robin has been more reliable if you can find one. Both of these engines should get get well over 100 miles per gallon (but not close to 200 mpg). The Honda GX50 has been more reliable than the GX35 and should still go over 100 miles to the gallon. We do not have any members that consistently get 200 miles per gallon. I only see 200 mpg in the college contests where they ride recumbent trikes with aero body panels over long, slow distances. Those 200 mpg aero trikes would be very difficult to drive in city traffic.
    How much mileage does your 50cc 2 stroke engine give?
    My little two stroke gets roughly 100 mpg. We have no hills where I live but we get strong coastal headwinds.
    Also, what about brakes because ordinary brake won't work?
    The most important thing is that you have a front brake on your motor bike. Even a BMX caliper brake helps a lot. I have an old front drum brake wheel on my bike that came from an industrial trike. A front disc is best but requires a disc compatible wheel and fork.
    Lastly, can I choose my setup to be manual or automatic transmission, and if I can which one should I choose?
    Four stroke kits come with an automatic clutch (no hand lever required)
    Two stroke, in frame kits almost always come with I hand clutch. My 2 stroke came with a hand clutch and I later added an automatic clutch.

    P.S:- I am ready to pedal hard if it improves my mileage, so is it possible to keep the pedals after the kit is installed?
    Motor kits allow you to keep the padals. Most people pedal to 10 mph or so and then let the engine do the work. Pedaling more does improve fuel economy. On a multi-speed bicycle, you can pedal almost the whole time if desired. I would want to pedal as little as possible in the summer in India.
    I am really sorry if I troubled you which I guess I did :p
    Thank you so much*
    I am glad to help. We were all new to the hobby at one time and asking the same questions.
     
  13. joshua97

    joshua97 Member

    200 mpg is a pretty big ask usually 100 to 150 max. pedals stay on always and bike will still function normally. regular breaks will be fine, 4 stokes are usually all auto, 2 strokes have a single speed manual clutch. let go of lever to start, pull in when you want to stop. 4 strokes have better economy and are heavier, bigger but some people say more reliable, but need oil changes ect. i still say 2 stroke as its easier and better
     
  14. joshua97

    joshua97 Member

    not if u go chain drive, generally speaking u will be constantly buckling wheels, (depending on quality tho) i use a HD wheel so sprockets on the hub :)
     
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