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High Performance Bicycle Engine Tips and Motorized

We all want our bicycle engines to push our bikes faster. Get exclusive engine modification tips and suggestions from us. Also check out some of our racing members builds

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  1. Sticky Threads
  2. Dave31
    Locked Sticky

    Warning to all about performance mods to your motorized bicycle

    Dave31, Jun 28, 2009
    Replies:
    1
    Views:
    27,215
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. stv1jzgte

    How fast can your 49cc Really go?

    stv1jzgte, Feb 22, 2009 ... 2 3
    Replies:
    59
    Views:
    56,973
    Hickory Hill
    Hickory Hill
    Jun 29, 2019
  5. mrfubs

    Stihl ms660 54mm project

    mrfubs, Jun 7, 2018 ... 2
    Replies:
    22
    Views:
    4,430
    javy mcdees
    javy mcdees
    May 23, 2019
  6. graydog8josh

    dellorto phbg 19mm carb from treatland tuning woes

    graydog8josh, Feb 27, 2014 ... 2
    Replies:
    26
    Views:
    7,013
    javy mcdees
    javy mcdees
    May 11, 2019
  8. Nate&Brandi

    What's the smallest rear sprocket you can/used? *story time with pics*

    Nate&Brandi, Feb 16, 2019
    Replies:
    2
    Views:
    453
    zing
    zing
    Mar 15, 2019
  9. ChiefMongrel

    What size carb should I use?

    ChiefMongrel, Jan 22, 2018
    Replies:
    7
    Views:
    703
    Jimmy Bloodmaker
    Jimmy Bloodmaker
    Feb 23, 2019
  10. Pedrito0906

    Piston crown mod!

    Pedrito0906, Jun 29, 2013
    Replies:
    18
    Views:
    7,459
    MacZulu
    MacZulu
    Feb 16, 2019
  11. Mike_Honcho

    Removing welch plug HuaSheng 49cc 4 stroke

    Mike_Honcho, Jan 10, 2019
    Replies:
    11
    Views:
    489
    Tom from Rubicon
    Tom from Rubicon
    Jan 13, 2019
  12. DuctTapedGoat

    Porting - are you actually taking advantage of it?

    DuctTapedGoat, May 7, 2011 ... 2
    Replies:
    38
    Views:
    20,148
    Tool Dog
    Tool Dog
    Dec 17, 2018
  13. stock762

    Performance build WIP ...Video

    stock762, Oct 14, 2017
    Replies:
    18
    Views:
    1,369
    Márk Vörös
    Márk Vörös
    Dec 6, 2018
  14. onanysunday

    NGK BP6HS = Higher Compression?

    onanysunday, Apr 23, 2011 ... 2
    Replies:
    20
    Views:
    10,297
    Citi-sporter
    Citi-sporter
    Sep 15, 2018
  15. TheNecromancer13

    212cc Predator Experiment - Performance Build

    TheNecromancer13, Aug 23, 2018
    Replies:
    10
    Views:
    1,023
    Tony01
    Tony01
    Sep 11, 2018
  17. talbotti

    wet clutch experiment

    talbotti, Jan 27, 2012
    Replies:
    13
    Views:
    3,750
    cannonball2
    cannonball2
    Sep 7, 2018
  18. exokinetic

    Apollo Moto Racing - Current Race Engine Build List

    exokinetic, Apr 24, 2016
    Replies:
    3
    Views:
    3,184
    kaneto
    kaneto
    Aug 5, 2018
  19. datz510

    High Performance Dellorto carb found!

    datz510, Jul 23, 2008 ... 2 3 4
    Replies:
    78
    Views:
    72,275
    Hashbrown
    Hashbrown
    Jul 20, 2018
  20. Nnn

    Is Head shaving a mod?

    Nnn, Jul 14, 2018
    Replies:
    5
    Views:
    501
    Venice Motor Bikes
    Venice Motor Bikes
    Jul 16, 2018
  21. Hashbrown

    Bogging uphill.

    Hashbrown, Jul 9, 2018
    Replies:
    6
    Views:
    520
    Hashbrown
    Hashbrown
    Jul 15, 2018
  22. wtwrestling07

    Changing Bearings

    wtwrestling07, Mar 7, 2015
    Replies:
    3
    Views:
    2,422
    Inf3ct3d89
    Inf3ct3d89
    Jun 10, 2018
  23. MattK

    Carburettor Plug and Jet change (on 49cc china motor) Observations

    MattK, May 7, 2018
    Replies:
    13
    Views:
    953
    Tyler6357
    Tyler6357
    May 28, 2018
  24. mountain80

    dellorto phbg questions

    mountain80, Nov 8, 2009
    Replies:
    3
    Views:
    1,848
    SIMON.j.k
    SIMON.j.k
    Apr 27, 2018
  26. mike carter 2

    kings motors gt 80

    mike carter 2, May 17, 2016 ... 4 5 6
    Replies:
    106
    Views:
    17,949
    mike carter 2
    mike carter 2
    Feb 22, 2018
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