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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:
    28,023
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. mrfubs

    Stihl ms660 54mm project

    mrfubs, Jun 7, 2018 ... 2
    Replies:
    24
    Views:
    7,140
    mrfubs
    mrfubs
    Oct 7, 2019
  5. Joshua_ schwinn_lowrider

    Engine Not Starting After Port Work.

    Joshua_ schwinn_lowrider, May 27, 2016
    Replies:
    16
    Views:
    4,264
    kelly dean
    kelly dean
    Oct 4, 2019
  6. shiveralex

    Bicylce-Engines expansion chamber

    shiveralex, Apr 11, 2017 ... 2
    Replies:
    23
    Views:
    7,101
    kelly dean
    kelly dean
    Oct 4, 2019
  8. Mercman

    Best overall 66 cc carb?

    Mercman, Mar 27, 2012 ... 2
    Replies:
    36
    Views:
    19,172
    BjevonT
    BjevonT
    Oct 2, 2019
  9. Pedrito0906

    Piston crown mod!

    Pedrito0906, Jun 29, 2013 ... 2
    Replies:
    20
    Views:
    8,454
    FOG
    FOG
    Sep 21, 2019
  10. Jeff J10

    PLEASE HELP!!

    Jeff J10, Aug 10, 2019
    Replies:
    15
    Views:
    631
    javy mcdees
    javy mcdees
    Aug 31, 2019
  11. FoCoMoTo

    Low end power mods!

    FoCoMoTo, Apr 26, 2013 ... 2
    Replies:
    20
    Views:
    14,704
    Bossboots
    Bossboots
    Aug 4, 2019
  12. Alex Reiner

    Is my top speed of 25 MPH all it's got?

    Alex Reiner, Jul 29, 2019
    Replies:
    1
    Views:
    307
    indian22
    indian22
    Jul 30, 2019
  13. stv1jzgte

    How fast can your 49cc Really go?

    stv1jzgte, Feb 22, 2009 ... 2 3 4
    Replies:
    60
    Views:
    61,515
    Sldgehmmr
    Sldgehmmr
    Jul 29, 2019
  14. graydog8josh

    dellorto phbg 19mm carb from treatland tuning woes

    graydog8josh, Feb 27, 2014 ... 2
    Replies:
    26
    Views:
    7,868
    javy mcdees
    javy mcdees
    May 11, 2019
  15. Nate&Brandi

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

    Nate&Brandi, Feb 16, 2019
    Replies:
    2
    Views:
    666
    zing
    zing
    Mar 15, 2019
  17. ChiefMongrel

    What size carb should I use?

    ChiefMongrel, Jan 22, 2018
    Replies:
    7
    Views:
    974
    Jimmy Bloodmaker
    Jimmy Bloodmaker
    Feb 23, 2019
  18. Mike_Honcho

    Removing welch plug HuaSheng 49cc 4 stroke

    Mike_Honcho, Jan 10, 2019
    Replies:
    11
    Views:
    688
    Tom from Rubicon
    Tom from Rubicon
    Jan 13, 2019
  19. DuctTapedGoat

    Porting - are you actually taking advantage of it?

    DuctTapedGoat, May 7, 2011 ... 2
    Replies:
    38
    Views:
    21,523
    Tool Dog
    Tool Dog
    Dec 17, 2018
  20. stock762

    Performance build WIP ...Video

    stock762, Oct 14, 2017
    Replies:
    18
    Views:
    1,714
    Márk Vörös
    Márk Vörös
    Dec 6, 2018
  21. onanysunday

    NGK BP6HS = Higher Compression?

    onanysunday, Apr 23, 2011 ... 2
    Replies:
    20
    Views:
    11,092
    Citi-sporter
    Citi-sporter
    Sep 15, 2018
  22. TheNecromancer13

    212cc Predator Experiment - Performance Build

    TheNecromancer13, Aug 23, 2018
    Replies:
    10
    Views:
    1,517
    Tony01
    Tony01
    Sep 11, 2018
  23. talbotti

    wet clutch experiment

    talbotti, Jan 27, 2012
    Replies:
    13
    Views:
    4,160
    cannonball2
    cannonball2
    Sep 7, 2018
  24. exokinetic

    Apollo Moto Racing - Current Race Engine Build List

    exokinetic, Apr 24, 2016
    Replies:
    3
    Views:
    3,579
    kaneto
    kaneto
    Aug 5, 2018
  26. datz510

    High Performance Dellorto carb found!

    datz510, Jul 23, 2008 ... 2 3 4
    Replies:
    78
    Views:
    73,240
    Hashbrown
    Hashbrown
    Jul 20, 2018
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