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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:
    24,110
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. stv1jzgte

    How fast can your 49cc Really go?

    stv1jzgte, Feb 22, 2009 ... 2 3
    Replies:
    45
    Views:
    38,297
    Venice Motor Bikes
    Venice Motor Bikes
    Oct 17, 2017 at 10:04 PM
  5. stock762

    Performance build WIP ...Video

    stock762, Oct 14, 2017 at 4:25 PM
    Replies:
    6
    Views:
    62
    stock762
    stock762
    Oct 17, 2017 at 8:18 PM
  6. DRK

    Square or round exhaust port?

    DRK, May 19, 2017
    Replies:
    5
    Views:
    591
    sbest
    sbest
    Oct 15, 2017 at 8:52 PM
  8. Jellyfish420

    Which reed valve and carb

    Jellyfish420, Sep 16, 2017
    Replies:
    0
    Views:
    135
    Jellyfish420
    Jellyfish420
    Sep 16, 2017
  9. Keef B

    Thinkin of change from SHA Dellarto to a walbro or mikuni Carb

    Keef B, Jan 7, 2016
    Replies:
    6
    Views:
    1,659
    Nanfoe
    Nanfoe
    Aug 6, 2017
  10. Jellyfish420

    Best single bolt on mod

    Jellyfish420, Jul 22, 2017
    Replies:
    13
    Views:
    386
    TheNecromancer13
    TheNecromancer13
    Jul 25, 2017
  11. bajaracer1

    My first race bike build 212cc predator!

    bajaracer1, Jul 24, 2012 ... 6 7 8
    Replies:
    155
    Views:
    59,358
    CycleRyder
    CycleRyder
    Jul 5, 2017
  12. Ichigo

    Anyone have the expansion chamber with muffler?

    Ichigo, Jun 23, 2017
    Replies:
    3
    Views:
    332
    mike carter 2
    mike carter 2
    Jul 2, 2017
  13. mike carter 2

    kings motors gt 80

    mike carter 2, May 17, 2016 ... 4 5 6
    Replies:
    105
    Views:
    14,055
    mike carter 2
    mike carter 2
    May 31, 2017
  14. Scooterduder

    Looking for great performance parts for an Arrow 7hp Big Block

    Scooterduder, Apr 30, 2017
    Replies:
    9
    Views:
    877
    Ron344
    Ron344
    May 18, 2017
  15. dumpstercrusher

    anyone using arrows 4.5 or 9 hp kit?

    dumpstercrusher, Jun 17, 2013
    Replies:
    15
    Views:
    6,045
    scotto-
    scotto-
    May 1, 2017
  17. shiveralex

    Bicylce-Engines expansion chamber

    shiveralex, Apr 11, 2017
    Replies:
    19
    Views:
    2,252
    Scooterduder
    Scooterduder
    Apr 30, 2017
  18. aarcher30

    gt80 won't start

    aarcher30, Mar 19, 2017
    Replies:
    7
    Views:
    914
    Chaz
    Chaz
    Mar 25, 2017
  19. scotto-

    Felt Cruiser Build......not for cruising

    scotto-, Aug 14, 2011 ... 26 27 28
    Replies:
    556
    Views:
    169,538
    scotto-
    scotto-
    Mar 18, 2017
  20. msrfan

    54 Schwinn 24'' DX My Next Race Bike

    msrfan, Jul 30, 2011 ... 5 6 7
    Replies:
    131
    Views:
    36,235
    curtisfox
    curtisfox
    Feb 9, 2017
  21. Potato_In_Exhaust

    100LL Aviation Fuel

    Potato_In_Exhaust, Feb 3, 2017
    Replies:
    1
    Views:
    778
    scotto-
    scotto-
    Feb 4, 2017
  22. BlazeAZ314

    Cant seem to pass 30mph

    BlazeAZ314, Jan 6, 2017
    Replies:
    7
    Views:
    2,067
    mike carter 2
    mike carter 2
    Jan 15, 2017
  23. Keef B

    Tuning your expansion chamber and Carburetor

    Keef B, May 10, 2016
    Replies:
    14
    Views:
    4,300
    Bass ackwards
    Bass ackwards
    Dec 21, 2016
  24. multipaul

    Crankshaft balancing and truing (part...)

    multipaul, Jul 5, 2012
    Replies:
    15
    Views:
    30,957
    Bonnygirl
    Bonnygirl
    Dec 13, 2016
  26. FFV8

    20mm Walbro on a China Girl

    FFV8, Sep 19, 2014
    Replies:
    16
    Views:
    7,039
    mike carter 2
    mike carter 2
    Nov 9, 2016
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