Gas or ebike?

Discussion in 'Motorized Bicycle General Discussion' started by haste, Oct 1, 2011.

  1. haste

    haste New Member

    Joined:
    Aug 2, 2009
    Messages:
    131
    Likes Received:
    0
    Have a nice trek mtb for china girl or electric dd hub motor. I wanna do ebike, but I don't want 8 mile range and 35 topend... An batteries that could burn down my house.. Ideas? Can a 80cc motor get up to 40 with mods?
     
  2. 2door

    2door Moderator
    Staff Member

    Joined:
    Sep 15, 2008
    Messages:
    16,301
    Likes Received:
    25
    40mph is pushing it. Youy've got a bicycle, not a motorcycle. 25 to 30 is a reasonable speed to expect from a non-modified engine. Don't be fooled by some of the speed claims you'll see posted here. 40 is possible but not without some modifications and some clear understanding of the engine and drive trane.
    There is battery technology available to allow a longer range but be prepaired to spend some $ for them. Check out our electric bike section for input on e-bikes.
    Good luck, ride safe.
    Tom
     
  3. wheelbender6

    wheelbender6 Active Member

    Joined:
    Sep 4, 2008
    Messages:
    3,816
    Likes Received:
    10
    I agree that 40 mph is probably your upper limit with a china girl motor.
    You can make an electric bike that will do 40 mph, but it is very expensive to make
    an ebike that will do that speed for longer than 15 minutes.
    An ebike won the last Spookytooth Death Race. I have not seen any details or specs on that ebike.
     
  4. fasteddy

    fasteddy Well-Known Member

    Joined:
    Feb 13, 2009
    Messages:
    5,432
    Likes Received:
    48
    Go to the Endless Sphere site. There are the best of the best electric bike builders there. Ask questions and you will get answers.

    My bike is built to go 20 mph with a 500W geared hub motor and a 36V lithium polymer battery with a 20 mile range. Cost of the battery and hub motor? Close to $1,800.

    It's legal everywhere I go. I weighed this against the $5.000 fines some of the members have been given for having gas motors on bicycles. Check you local and state laws first.

    My current build has a 98cc gas motor and a 2 speed transmission which puts it the motorcycle status. Can't ride it on the road where I live since I can't register it. Needs an approved makers assigned vin number. At least I can say I built it.

    Steve.
     
  5. haste

    haste New Member

    Joined:
    Aug 2, 2009
    Messages:
    131
    Likes Received:
    0
    Are all the 2 stroke kits gone? No site has them?
     
  6. Mozenrath

    Mozenrath New Member

    Joined:
    Jan 13, 2011
    Messages:
    340
    Likes Received:
    0
    ^^ Rawmotors.com still has kits but they're way expensive. I think gasbike.net also has kits, and you can still get kits on eBay.
     
  7. Tahq

    Tahq New Member

    Joined:
    Sep 2, 2011
    Messages:
    45
    Likes Received:
    0
    I looked into electric originally myself, I have even built a small solar set up that I could use to charge.

    When I reviewed all my options I decided the best bang for the buck for my needs was a four stroke kit. There are a few a few vendors on this sit that sell kits. If you go that route make sure you buy a kit with a decent gearbox...Grubee 4 or even better the Q-matic, just depends on your budget.

    If your you want to push toward 40mph you could also look into a shift kit, SBP seems to be the named favorite on site. Do a few mods, change a few sprockets, and you can get to what you are looking for speed wise...just remember you would be doing 40mph on a bike.
     
  8. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

    Joined:
    Mar 20, 2008
    Messages:
    6,169
    Likes Received:
    18
    You'll never get any real performance from a hub type electric bike! I've ridden them, they're dogs! :(
    The E-bikes that performed well at the MB races were full on custom race bikes built by guys who really know their stuff. (& also had some big time coin into them.)
    & I don't care what the 4-stroke guys say... Pound per pound & dollar per dollar, you'll get the most bang for your buck from a 2-stroke. ;)
     
    #8 Venice Motor Bikes, Oct 2, 2011
    Last edited: Oct 2, 2011
  9. Tahq

    Tahq New Member

    Joined:
    Sep 2, 2011
    Messages:
    45
    Likes Received:
    0
    Ay, leave us older, easy cruising, trailer pulling, don't want to mess with mixing guys enjoy our four strokers!

    If you want go fast and save a few bucks the 2 poppers are the way to go, but if you want to leave your blinker on for 23 miles and hear yourself mumble while having a little more dependability consider a four stroke.

    Both engines have there pluses and minuses, just do a little research and see what is a better fit for you. There are some great builders and kits on site that can fit your needs. Agree, though, that the electrics I looked at where heavier on the wallet for what I wanted.
     
  10. haste

    haste New Member

    Joined:
    Aug 2, 2009
    Messages:
    131
    Likes Received:
    0
    Yeah, a hub motor, better controller, and batteries (lipo) will be around 800 bucks. Could build a full 2 stroke, shift kit , sbp pipe, NGk plugs , and all for 400 max including the kit. Sad thing the electric will have a 15 mile range and batteries only last a year lol.

    Are the 2 strokes not coming into us anymore?
     
  11. fasteddy

    fasteddy Well-Known Member

    Joined:
    Feb 13, 2009
    Messages:
    5,432
    Likes Received:
    48
    Haste,
    Where did you get a deal like that for a hub and batteries?

    Steve.
     
  12. biknut

    biknut Active Member

    Joined:
    Sep 28, 2010
    Messages:
    6,365
    Likes Received:
    3
    The answer is yes, a good running China Girl will do about 40 mph top speed with a 36T sprocket, but cruising speed will probably be about 35 mph. If you plan to go that fast, a lot, you better have a good quality bicycle, with good brakes.
     
  13. wheelbender6

    wheelbender6 Active Member

    Joined:
    Sep 4, 2008
    Messages:
    3,816
    Likes Received:
    10
    Lipo batteries can last three years. It is the SLAs that die in a year.
     
  14. NormO

    NormO New Member

    Joined:
    Jun 15, 2011
    Messages:
    197
    Likes Received:
    0
    I've heard Lippo can be a hit or miss affair.
     

Share This Page