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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:
    23,976
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. Jellyfish420

    Which reed valve and carb

    Jellyfish420, Sep 16, 2017
    Replies:
    0
    Views:
    65
    Jellyfish420
    Jellyfish420
    Sep 16, 2017
  5. stv1jzgte

    How fast can your 49cc Really go?

    stv1jzgte, Feb 22, 2009 ... 2
    Replies:
    38
    Views:
    37,568
    mbearden
    mbearden
    Sep 7, 2017
  6. Keef B

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

    Keef B, Jan 7, 2016
    Replies:
    6
    Views:
    1,630
    Nanfoe
    Nanfoe
    Aug 6, 2017
  7. Jellyfish420

    Best single bolt on mod

    Jellyfish420, Jul 22, 2017
    Replies:
    13
    Views:
    339
    TheNecromancer13
    TheNecromancer13
    Jul 25, 2017
  8. bajaracer1

    My first race bike build 212cc predator!

    bajaracer1, Jul 24, 2012 ... 6 7 8
    Replies:
    155
    Views:
    58,869
    CycleRyder
    CycleRyder
    Jul 5, 2017
  9. Ichigo

    Anyone have the expansion chamber with muffler?

    Ichigo, Jun 23, 2017
    Replies:
    3
    Views:
    297
    mike carter 2
    mike carter 2
    Jul 2, 2017
  10. mike carter 2

    kings motors gt 80

    mike carter 2, May 17, 2016 ... 4 5 6
    Replies:
    105
    Views:
    13,806
    mike carter 2
    mike carter 2
    May 31, 2017
  11. DRK

    Square or round exhaust port?

    DRK, May 19, 2017
    Replies:
    4
    Views:
    516
    Dan
    Dan
    May 31, 2017
  12. Scooterduder

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

    Scooterduder, Apr 30, 2017
    Replies:
    9
    Views:
    831
    Ron344
    Ron344
    May 18, 2017
  13. dumpstercrusher

    anyone using arrows 4.5 or 9 hp kit?

    dumpstercrusher, Jun 17, 2013
    Replies:
    15
    Views:
    5,957
    scotto-
    scotto-
    May 1, 2017
  14. shiveralex

    Bicylce-Engines expansion chamber

    shiveralex, Apr 11, 2017
    Replies:
    19
    Views:
    2,054
    Scooterduder
    Scooterduder
    Apr 30, 2017
  15. aarcher30

    gt80 won't start

    aarcher30, Mar 19, 2017
    Replies:
    7
    Views:
    894
    Chaz
    Chaz
    Mar 25, 2017
  16. scotto-

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

    scotto-, Aug 14, 2011 ... 26 27 28
    Replies:
    556
    Views:
    168,817
    scotto-
    scotto-
    Mar 18, 2017
  17. msrfan

    54 Schwinn 24'' DX My Next Race Bike

    msrfan, Jul 30, 2011 ... 5 6 7
    Replies:
    131
    Views:
    35,981
    curtisfox
    curtisfox
    Feb 9, 2017
  18. Potato_In_Exhaust

    100LL Aviation Fuel

    Potato_In_Exhaust, Feb 3, 2017
    Replies:
    1
    Views:
    749
    scotto-
    scotto-
    Feb 4, 2017
  19. BlazeAZ314

    Cant seem to pass 30mph

    BlazeAZ314, Jan 6, 2017
    Replies:
    7
    Views:
    2,023
    mike carter 2
    mike carter 2
    Jan 15, 2017
  20. Keef B

    Tuning your expansion chamber and Carburetor

    Keef B, May 10, 2016
    Replies:
    14
    Views:
    4,239
    Bass ackwards
    Bass ackwards
    Dec 21, 2016
  21. multipaul

    Crankshaft balancing and truing (part...)

    multipaul, Jul 5, 2012
    Replies:
    15
    Views:
    30,660
    Bonnygirl
    Bonnygirl
    Dec 13, 2016
  22. FFV8

    20mm Walbro on a China Girl

    FFV8, Sep 19, 2014
    Replies:
    16
    Views:
    6,945
    mike carter 2
    mike carter 2
    Nov 9, 2016
  23. scratchbuilder

    briggs timing...firing before tdc??

    scratchbuilder, Nov 4, 2016
    Replies:
    13
    Views:
    1,713
    Tony01
    Tony01
    Nov 8, 2016
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