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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:
    28,435
    Clotho
    Clotho
    Jun 28, 2009
  3. Normal Threads
  4. Mercman

    Center Stand?

    Mercman, Feb 23, 2012
    Replies:
    17
    Views:
    3,734
    indian22
    indian22
    Feb 19, 2020
  5. Morbius18

    Port matching case to cylinder

    Morbius18, Feb 18, 2020
    Replies:
    1
    Views:
    61
    Morbius18
    Morbius18
    Feb 18, 2020
  6. breath_easy13

    Removing Governor on 212cc, Oil sensor question -

    breath_easy13, Jan 4, 2020
    Replies:
    5
    Views:
    222
    breath_easy13
    breath_easy13
    Jan 5, 2020
  8. mrfubs

    Stihl ms660 54mm project

    mrfubs, Jun 7, 2018 ... 2
    Replies:
    24
    Views:
    8,603
    mrfubs
    mrfubs
    Oct 7, 2019
  9. Joshua_ schwinn_lowrider

    Engine Not Starting After Port Work.

    Joshua_ schwinn_lowrider, May 27, 2016
    Replies:
    16
    Views:
    4,432
    kelly dean
    kelly dean
    Oct 4, 2019
  10. shiveralex

    Bicylce-Engines expansion chamber

    shiveralex, Apr 11, 2017 ... 2
    Replies:
    23
    Views:
    7,429
    kelly dean
    kelly dean
    Oct 4, 2019
  11. Mercman

    Best overall 66 cc carb?

    Mercman, Mar 27, 2012 ... 2
    Replies:
    36
    Views:
    19,679
    BjevonT
    BjevonT
    Oct 2, 2019
  12. Pedrito0906

    Piston crown mod!

    Pedrito0906, Jun 29, 2013 ... 2
    Replies:
    20
    Views:
    8,964
    FOG
    FOG
    Sep 21, 2019
  13. Jeff J10

    PLEASE HELP!!

    Jeff J10, Aug 10, 2019
    Replies:
    15
    Views:
    686
    javy mcdees
    javy mcdees
    Aug 31, 2019
  14. FoCoMoTo

    Low end power mods!

    FoCoMoTo, Apr 26, 2013 ... 2
    Replies:
    20
    Views:
    15,648
    Bossboots
    Bossboots
    Aug 4, 2019
  15. Alex Reiner

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

    Alex Reiner, Jul 29, 2019
    Replies:
    1
    Views:
    409
    indian22
    indian22
    Jul 30, 2019
  17. stv1jzgte

    How fast can your 49cc Really go?

    stv1jzgte, Feb 22, 2009 ... 2 3 4
    Replies:
    60
    Views:
    63,141
    Sldgehmmr
    Sldgehmmr
    Jul 29, 2019
  18. graydog8josh

    dellorto phbg 19mm carb from treatland tuning woes

    graydog8josh, Feb 27, 2014 ... 2
    Replies:
    26
    Views:
    8,250
    javy mcdees
    javy mcdees
    May 11, 2019
  19. Nate&Brandi

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

    Nate&Brandi, Feb 16, 2019
    Replies:
    2
    Views:
    740
    zing
    zing
    Mar 15, 2019
  20. ChiefMongrel

    What size carb should I use?

    ChiefMongrel, Jan 22, 2018
    Replies:
    7
    Views:
    1,051
    Jimmy Bloodmaker
    Jimmy Bloodmaker
    Feb 23, 2019
  21. Mike_Honcho

    Removing welch plug HuaSheng 49cc 4 stroke

    Mike_Honcho, Jan 10, 2019
    Replies:
    11
    Views:
    808
    Tom from Rubicon
    Tom from Rubicon
    Jan 13, 2019
  22. DuctTapedGoat

    Porting - are you actually taking advantage of it?

    DuctTapedGoat, May 7, 2011 ... 2
    Replies:
    38
    Views:
    22,199
    Tool Dog
    Tool Dog
    Dec 17, 2018
  23. stock762

    Performance build WIP ...Video

    stock762, Oct 14, 2017
    Replies:
    18
    Views:
    1,866
    Márk Vörös
    Márk Vörös
    Dec 6, 2018
  24. onanysunday

    NGK BP6HS = Higher Compression?

    onanysunday, Apr 23, 2011 ... 2
    Replies:
    20
    Views:
    11,497
    Citi-sporter
    Citi-sporter
    Sep 15, 2018
  26. TheNecromancer13

    212cc Predator Experiment - Performance Build

    TheNecromancer13, Aug 23, 2018
    Replies:
    10
    Views:
    1,760
    Tony01
    Tony01
    Sep 11, 2018
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