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:
    23,476
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. Ichigo

    Anyone have the expansion chamber with muffler?

    Ichigo, Jun 23, 2017 at 6:48 PM
    Replies:
    0
    Views:
    27
    Ichigo
    Ichigo
    Jun 23, 2017 at 6:48 PM
  5. mike carter 2

    kings motors gt 80

    mike carter 2, May 17, 2016 ... 4 5 6
    Replies:
    105
    Views:
    12,887
    mike carter 2
    mike carter 2
    May 31, 2017
  6. DRK

    Square or round exhaust port?

    DRK, May 19, 2017
    Replies:
    4
    Views:
    314
    Dan
    Dan
    May 31, 2017
  7. Scooterduder

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

    Scooterduder, Apr 30, 2017
    Replies:
    9
    Views:
    648
    Ron344
    Ron344
    May 18, 2017
  8. dumpstercrusher

    anyone using arrows 4.5 or 9 hp kit?

    dumpstercrusher, Jun 17, 2013
    Replies:
    15
    Views:
    5,660
    scotto-
    scotto-
    May 1, 2017
  9. shiveralex

    Bicylce-Engines expansion chamber

    shiveralex, Apr 11, 2017
    Replies:
    19
    Views:
    1,450
    Scooterduder
    Scooterduder
    Apr 30, 2017
  10. aarcher30

    gt80 won't start

    aarcher30, Mar 19, 2017
    Replies:
    7
    Views:
    739
    Chaz
    Chaz
    Mar 25, 2017
  11. scotto-

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

    scotto-, Aug 14, 2011 ... 26 27 28
    Replies:
    556
    Views:
    166,076
    scotto-
    scotto-
    Mar 18, 2017
  12. msrfan

    54 Schwinn 24'' DX My Next Race Bike

    msrfan, Jul 30, 2011 ... 5 6 7
    Replies:
    131
    Views:
    35,152
    curtisfox
    curtisfox
    Feb 9, 2017
  13. Potato_In_Exhaust

    100LL Aviation Fuel

    Potato_In_Exhaust, Feb 3, 2017
    Replies:
    1
    Views:
    661
    scotto-
    scotto-
    Feb 4, 2017
  14. BlazeAZ314

    Cant seem to pass 30mph

    BlazeAZ314, Jan 6, 2017
    Replies:
    7
    Views:
    1,820
    mike carter 2
    mike carter 2
    Jan 15, 2017
  15. Keef B

    Tuning your expansion chamber and Carburetor

    Keef B, May 10, 2016
    Replies:
    14
    Views:
    3,927
    Bass ackwards
    Bass ackwards
    Dec 21, 2016
  16. multipaul

    Crankshaft balancing and truing (part...)

    multipaul, Jul 5, 2012
    Replies:
    15
    Views:
    29,830
    Bonnygirl
    Bonnygirl
    Dec 13, 2016
  17. FFV8

    20mm Walbro on a China Girl

    FFV8, Sep 19, 2014
    Replies:
    16
    Views:
    6,670
    mike carter 2
    mike carter 2
    Nov 9, 2016
  18. scratchbuilder

    briggs timing...firing before tdc??

    scratchbuilder, Nov 4, 2016
    Replies:
    13
    Views:
    1,603
    Tony01
    Tony01
    Nov 8, 2016
  19. vhatley

    How Many Cyl Bottom Gasket(s)

    vhatley, Oct 18, 2016
    Replies:
    4
    Views:
    1,344
    vhatley
    vhatley
    Oct 19, 2016
  20. Amarion1

    212 predator build

    Amarion1, Nov 28, 2015 ... 2 3
    Replies:
    51
    Views:
    9,663
    scotto-
    scotto-
    Oct 7, 2016
  21. Wags

    Jaguar cdi

    Wags, Sep 13, 2016
    Replies:
    0
    Views:
    1,138
    Wags
    Wags
    Sep 13, 2016
  22. Wags

    Sick bike pipe rpm?

    Wags, Sep 7, 2016
    Replies:
    3
    Views:
    2,060
    Wags
    Wags
    Sep 13, 2016
  23. ivan H

    Performance CDI layout and schematic diagrams

    ivan H, Sep 2, 2013 ... 7 8 9
    Replies:
    162
    Views:
    52,580
    beeler54321
    beeler54321
    Sep 8, 2016
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