Newbie from Albuquerque NM, 80cc chinese engine with mods

Discussion in 'Introduce Yourself' started by quarkdude, Jul 19, 2007.

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  1. quarkdude

    quarkdude Guest

    Hello all,
    I just stumbled across this website today and am very excited seeing how many motorized bikes are really out there. I ride mine to work almost everyday, ( a 20 mile round trip ). I have gotten my speed up to 36.4 mph. Definitely moves. I have done some mods to the stock engine to get more power out of it - Albuquerque, NM is 5200 feet above sea level so more power makes it a blast to ride. I started with changing the jetting for our altitude here. The stock jet was a little too rich for up here so I tried to locate an aftermarket jet - they pretty much don't exist. So I read about someone that used silver solder to solder closed the hole in the jet and then re-drilled it. I did this and with a little experimentation found what jet size worked the best. Turns out 0.028 is the magic number for my setup. Then I bought a plastic free flow air cleaner cover for more airflow. Bought the stainless steel intake mainfold for more flow. And lastly I read about taking the baffle out of the stock exhaust pipe and cutting it down to sort of mimic an expansion chamber exhaust. Really noticed a difference when I did that. Does get a bit louder when you do this. So all together all the mods get this bike up to about 35-36 mph with a 44 tooth rear sprocket. I'll post some pictures of it in the gallery. It is a black 1995 Diamond Back mountain bike with a black gas tank.
    ......................Bill, from Albuquerque

  2. locoWelder

    locoWelder Guest

    welcome to MBc ! Q-dude 8)
  3. quarkdude

    quarkdude Guest

    Thanks LocoWelder

    Can't wait to put some pictures up of the bike. I'll try tomorrow
  4. bamabikeguy

    bamabikeguy Active Member

    I banged into that reality climbing up to Denver and the altitude didn't turn me loose until dropping back under 3,000 feet south of the Oklapanhandle....

    When you get pixability, you could demonstrate that trick in TechMech.

    Welcome aboard.
  5. beach cruzin

    beach cruzin Guest

    sounds good welcome
  6. azbill

    azbill Active Member

    welcome to MBc Bill ! :D
    a how-to on the carb mods would be pretty nice
  7. Welcome :grin:
  8. srdavo

    srdavo Active Member

    Welcome to MBc 8)
  9. drimpact

    drimpact Member

    Welcome, I can't wait for your info on Carb mods!
  10. Big Papa Pun

    Big Papa Pun Guest

    What's Up From Santa Fe
  11. SlicerDicer

    SlicerDicer Guest

    Well if you see a yellow beast shooting around on a umm kinda crazy looking bicycle that is modified to a oblivion with a 6.5hp motor thats me :shock:
  12. spunout

    spunout Member

    Welcome to MBc! nice intro 8) 8)
    Happy :mrgreen:
  13. quarkdude

    quarkdude Guest

    Hello spunout, SlicerDicer and Big Papa Pun,

    Thanks for the warm welcomes and the alert to look for the yellow beast crusing around Rio Rancho. I work a lot of hours Mon-Fri, but I haven't forgot about documenting my carb mods. I am thinking about how to organize it to make it easy to do. I will make a text version and then edit it later with pictures. I'll put links in on where to get some of the aftermarket parts that I have found. CARB MODS INSTRUCTIONS coming soon.
    :grin: Since I'm new here should I post the Carb mods to the TechMech area?:grin:
    ...........Thanks, quarkdude
  14. azbill

    azbill Active Member

    the perfect place !!!
    hopefully to end up in the manual area after it is deemed 'worthy'
  15. OldPete

    OldPete Guest

    Welcome. :smile:
    Albuquerque...home of the Unsers. Jerry was in the Navy with my Dad back in '53.

    Back in the day we would fill the main jet with Super Glue, let it harden, then open it up a little at a time with a very hot needle. Worked when the dirt bikes were used mile high.
    Looking forward to the tutorial.
  16. quarkdude

    quarkdude Guest

    Hello ol' Pete,
    Using super glue sounds like an ingeniuos MacGyver solution to an impossible situation like trying to find jets for a Chinese 2 stroke engine. I bet that worked really well. Your description is basically what I have done, just using a soldering iron and 99% pure silver solder ( High Melting Point).
  17. OldPete

    OldPete Guest

    Once the weeping stops (pun intended), super-glue is fantastic for wound closure (another pun intended). That is why we had it with us. After a day of riding with fat jetting the solution came to us as we were drinking the evening's beer. It was easy to clean out once we got back to the high desert.

    Welcome once again. You will find all kinds of neat tips 'n tricks on this board. :smile:
  18. quay1962

    quay1962 Guest

    hey quarkdude good luck and welcome to MBc!

    good luck and happy motoring! :shock: :cool: :razz:
  19. quarkdude

    quarkdude Guest

    Hello quay1962,
    Thanks for the welcome. This site is awesome and the knowledge of the motorized bike here is probably the best on the web. Rode the bike into work today - the air temp was great, came in at 6am so not too many cars. Going home in traffic is always an experience here in Albuquerque.
    ............Thanks, quarkdude