Heads and Cylinders

All about your porting, compression, rings, cylinder and piston modifications to your bicycles engine

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  1. Sticky Threads
  2. BarelyAWake
    Sticky

    The Basics, Port & Polish and Port Matching

    BarelyAWake, Mar 20, 2010 ... 3 4 5
    Replies:
    98
    Views:
    85,553
    Porting newb
    Porting newb
    Jul 15, 2015
  3. Normal Threads
  4. Ruby478

    this may be a dumb question

    Ruby478, Oct 16, 2011 ... 2
    Replies:
    22
    Views:
    4,070
    Danny Torino
    Danny Torino
    Aug 14, 2017 at 11:17 PM
  5. jolfstn

    Jet 66/80cc motor only from gasbike.net or kings motor bikes

    jolfstn, Aug 12, 2017
    Replies:
    2
    Views:
    52
    jolfstn
    jolfstn
    Aug 12, 2017
  6. Jellyfish420

    Slant head orientation

    Jellyfish420, Jul 5, 2017
    Replies:
    3
    Views:
    173
    xseler
    xseler
    Jul 6, 2017
  7. doomedgame

    Rings

    doomedgame, Jun 23, 2017
    Replies:
    3
    Views:
    148
    crassius
    crassius
    Jun 24, 2017
  8. doomedgame

    Modded pistons

    doomedgame, Jun 18, 2017
    Replies:
    2
    Views:
    210
    doomedgame
    doomedgame
    Jun 22, 2017
  9. Flathead

    Jets

    Flathead, Nov 27, 2016
    Replies:
    5
    Views:
    2,002
    Greg58
    Greg58
    Jun 4, 2017
  10. mobike91

    Hybrid cylinder engine options

    mobike91, May 20, 2017
    Replies:
    1
    Views:
    321
    Dan
    Dan
    May 24, 2017
  11. Cylon

    New high comp head!

    Cylon, Apr 14, 2017
    Replies:
    13
    Views:
    933
    Cylon
    Cylon
    May 16, 2017
  12. Cylon

    High comp head.

    Cylon, Apr 14, 2017
    Replies:
    1
    Views:
    263
    mobike91
    mobike91
    May 15, 2017
  13. shiveralex

    49cc High compression head

    shiveralex, Apr 16, 2017
    Replies:
    4
    Views:
    672
    Tyler6357
    Tyler6357
    Apr 24, 2017
  14. BikerMatt

    Bad Top End?

    BikerMatt, Jul 17, 2016
    Replies:
    11
    Views:
    1,297
    Slogger
    Slogger
    Apr 4, 2017
  15. dale_m

    Mixing cylinder bodies?

    dale_m, Mar 15, 2017
    Replies:
    2
    Views:
    659
    sbest
    sbest
    Mar 16, 2017
  16. Flathead

    Head gaskets

    Flathead, Jan 10, 2016
    Replies:
    17
    Views:
    2,248
    crassius
    crassius
    Feb 26, 2017
  17. daveet6666

    headbolts with no nuts works great!!

    daveet6666, Feb 12, 2017
    Replies:
    3
    Views:
    732
    crassius
    crassius
    Feb 19, 2017
  18. thumper68

    Compression

    thumper68, Jan 17, 2017
    Replies:
    2
    Views:
    1,682
    thumper68
    thumper68
    Jan 18, 2017
  19. Mouse

    Big jugs

    Mouse, Jan 28, 2016
    Replies:
    12
    Views:
    3,826
    Mouse
    Mouse
    Dec 23, 2016
  20. crassius

    something to think about

    crassius, Nov 17, 2016
    Replies:
    2
    Views:
    1,142
    crassius
    crassius
    Nov 24, 2016
  21. SpeedingTurtle

    How to clean

    SpeedingTurtle, Oct 26, 2016
    Replies:
    1
    Views:
    1,020
    crassius
    crassius
    Oct 26, 2016
  22. Knuckledragger

    ZAE 50 connecting Rod

    Knuckledragger, Oct 24, 2014
    Replies:
    13
    Views:
    4,386
    granto102
    granto102
    Oct 20, 2016
  23. vhatley

    Port Matching Questions And A Good Word About A Supplier

    vhatley, Oct 15, 2016
    Replies:
    0
    Views:
    1,006
    vhatley
    vhatley
    Oct 15, 2016
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