Stock motor 38MPH

Discussion in '2 Stroke Bicycle Engines & Kits' started by DRK, May 8, 2017.

  1. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    This bike runs great all the way from 0mph - 38mph, no 4 stroking, no hesitation, pulls hard. I believe I'm getting everything out of this motor that it has. The problem is it will only do it without the air filter. Even using just one layer of panty hose with a rubber band for an air filter it drops 5 mph and 4 strokes. My question is, is there anyway I can get 38 mph and run a GOOD air filter? If you need anymore information just ask. Thanks.
     
    #1 DRK, May 8, 2017
    Last edited: May 8, 2017
  2. crassius

    crassius Well-Known Member

    Joined:
    Sep 30, 2012
    Messages:
    3,378
    Likes Received:
    35
    one might try a larger filter opening with a 'still air box', but that would require a lot of ducting
     
    #2 crassius, May 8, 2017
    Last edited: May 13, 2017
  3. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Thanks Crassius. Sadly, that's probably the correct solution. I just don't see me running duct work to a air filter the size of a dinner plate. lol! Thanks again.
     
    #3 DRK, May 8, 2017
    Last edited: May 8, 2017
  4. Slogger

    Slogger Member

    Joined:
    Sep 8, 2014
    Messages:
    545
    Likes Received:
    3
    My stock engine goes 38...
    but only down a hill. It has hit 33 on the flat. I was so proud. ;)
     
  5. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

    Joined:
    Mar 20, 2008
    Messages:
    6,166
    Likes Received:
    14
    I sounds like one jet size smaller will be perfect with a air filter. (^)
     
  6. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Hey Slogger, if I ran a air filter & exhaust that's probably as fast as mine would run.
     
  7. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Might try that. I'm running a Speed carb now with 66 jet, c-clip full rich & a 4'' long exhaust. Got 40mph going both directions on level blacktop. I realize this isn't good for my motor. Just want to find out how much can be gotten out of a stock motor without spending money on it. But I did have to buy a complete set of jets. I would like to be able to hit 40mph with a Good air filter & a semi quiet exhaust. I doubt I will be able to realize my goal. But hey, never hurts to try! Thanks for the advice VMB!
     
  8. Slogger

    Slogger Member

    Joined:
    Sep 8, 2014
    Messages:
    545
    Likes Received:
    3
    I generally ride around at about 24, 25 mph anyway. My brakes and stuff are lame and I'm not in a hurry. The muffler is worth a few mph.
    to me.
     
  9. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Yeah. 25mph is about where I cruise at most of the time. This is my first 2 smoker, just tryin' to find out what I can get out of a stock motor.
     
  10. mobike91

    mobike91 Member

    Joined:
    Sep 14, 2010
    Messages:
    111
    Likes Received:
    2
    38 out of a completely stock setup is pretty good. I wouldn't worry about the max speed. I'd worry more about max longevity. Iv had a few kits only last 100 miles before seizing up lol. Back when I was 16 and loved hitting wide open without a idle screw haha. It ran lean....
     
  11. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    That's definitely a possibility! I'm 61 years old, but when I get on this thing, I feel like that numbers' reversed. You have a great by-line Mobike91..wee.
     
  12. mobike91

    mobike91 Member

    Joined:
    Sep 14, 2010
    Messages:
    111
    Likes Received:
    2
    After about the 15th engine destroying itself in another various way, I began to realize that these little engines were not meant to be primary transportation and a racecar lol. One must have both a put put bike and a experimental race bike to be satisfied in riding these. My favorite engine detonation was when A roller bearing broke and tossed bearings into the cylinder, Swiss cheesing both the head and piston but some how it kept running at much less power. I rode that engine out for another 80 miles before a piston ring broke and scarred the cylinder, but man it was a die hard lol. zpt
     
  13. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    I agree, one to baby and one to run the s#*t out of!
     
  14. Motakitty

    Motakitty Member

    Joined:
    Feb 14, 2015
    Messages:
    442
    Likes Received:
    1
    I had the same issue. My stock air filter fell off and it felt like it had a turbo so I knew it needed a better flowing filter. I ended up modding a foam uni foam filter from a Honda ruckus and it runs just like it did without a filter
     
  15. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Thanks for the info on the Uni filter. Was wondering if one of those would flow enough air.
     
  16. Motakitty

    Motakitty Member

    Joined:
    Feb 14, 2015
    Messages:
    442
    Likes Received:
    1
    Oh I have the rt carb so not sure they would fit the stock nt carb
     
  17. Potato_In_Exhaust

    Joined:
    Feb 2, 2017
    Messages:
    161
    Likes Received:
    1
    Ain't no stock Chinese motor be running 38 mph...... in your dreams, maybe. Your butt speedometer isn't that accurate, buddy!
     
  18. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
     
    #18 DRK, May 16, 2017
    Last edited: May 16, 2017
  19. DRK

    DRK Member

    Joined:
    Apr 1, 2017
    Messages:
    59
    Likes Received:
    8
    Some people just don't know how to tune an engine. LOL ^^^^^^^
     
    #19 DRK, May 16, 2017
    Last edited: May 16, 2017
  20. Greg58

    Greg58 Well-Known Member

    Joined:
    May 1, 2011
    Messages:
    2,802
    Likes Received:
    42
    As Norm said jet down and it should run correct with the air filter, be sure and keep an eye on the spark plug color to keep from going too lean. lean makes heat, heat melts parts, engines seize, rear tire locks up, wait I may be telling too much. Don't ask how i know!
     

Share This Page