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:
    84,236
    Porting newb
    Porting newb
    Jul 15, 2015
  3. Normal Threads
  4. mobike91

    Hybrid cylinder engine options

    mobike91, May 20, 2017
    Replies:
    1
    Views:
    153
    Dan
    Dan
    May 24, 2017 at 3:39 AM
  5. Cylon

    New high comp head!

    Cylon, Apr 14, 2017
    Replies:
    13
    Views:
    706
    Cylon
    Cylon
    May 16, 2017
  6. Cylon

    High comp head.

    Cylon, Apr 14, 2017
    Replies:
    1
    Views:
    189
    mobike91
    mobike91
    May 15, 2017
  7. shiveralex

    49cc High compression head

    shiveralex, Apr 16, 2017
    Replies:
    4
    Views:
    512
    Tyler6357
    Tyler6357
    Apr 24, 2017
  8. BikerMatt

    Bad Top End?

    BikerMatt, Jul 17, 2016
    Replies:
    11
    Views:
    1,189
    Slogger
    Slogger
    Apr 4, 2017
  9. dale_m

    Mixing cylinder bodies?

    dale_m, Mar 15, 2017
    Replies:
    2
    Views:
    539
    sbest
    sbest
    Mar 16, 2017
  10. Flathead

    Head gaskets

    Flathead, Jan 10, 2016
    Replies:
    17
    Views:
    2,011
    crassius
    crassius
    Feb 26, 2017
  11. daveet6666

    headbolts with no nuts works great!!

    daveet6666, Feb 12, 2017
    Replies:
    3
    Views:
    652
    crassius
    crassius
    Feb 19, 2017
  12. thumper68

    Compression

    thumper68, Jan 17, 2017
    Replies:
    2
    Views:
    1,324
    thumper68
    thumper68
    Jan 18, 2017
  13. Mouse

    Big jugs

    Mouse, Jan 28, 2016
    Replies:
    12
    Views:
    3,713
    Mouse
    Mouse
    Dec 23, 2016
  14. Flathead

    Jets

    Flathead, Nov 27, 2016
    Replies:
    3
    Views:
    1,838
    Flathead
    Flathead
    Nov 30, 2016
  15. crassius

    something to think about

    crassius, Nov 17, 2016
    Replies:
    2
    Views:
    1,088
    crassius
    crassius
    Nov 24, 2016
  16. SpeedingTurtle

    How to clean

    SpeedingTurtle, Oct 26, 2016
    Replies:
    1
    Views:
    957
    crassius
    crassius
    Oct 26, 2016
  17. Knuckledragger

    ZAE 50 connecting Rod

    Knuckledragger, Oct 24, 2014
    Replies:
    13
    Views:
    4,071
    granto102
    granto102
    Oct 20, 2016
  18. vhatley

    Port Matching Questions And A Good Word About A Supplier

    vhatley, Oct 15, 2016
    Replies:
    0
    Views:
    931
    vhatley
    vhatley
    Oct 15, 2016
  19. Flathead

    Headbolts

    Flathead, Dec 29, 2015
    Replies:
    13
    Views:
    2,932
    mogollonmonster
    mogollonmonster
    Sep 11, 2016
  20. Flathead

    Piston

    Flathead, Jan 4, 2016
    Replies:
    7
    Views:
    1,762
    sbest
    sbest
    Aug 28, 2016
  21. StevenMain

    34 tooth swap, down hill, new personal best!

    StevenMain, Aug 12, 2016 ... 2 3
    Replies:
    43
    Views:
    3,577
    StevenMain
    StevenMain
    Aug 22, 2016
  22. StevenMain

    Slowing Top Speed

    StevenMain, Aug 10, 2016
    Replies:
    15
    Views:
    1,477
    StevenMain
    StevenMain
    Aug 11, 2016
  23. rohmell

    Has Anyone Ever Tried a Wooden Piston?

    rohmell, Jul 24, 2016
    Replies:
    3
    Views:
    1,053
    xseler
    xseler
    Jul 24, 2016
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