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Heads and Cylinders
All about your porting, compression, rings, cylinder and piston modifications to your bicycles engine
Forums
Motorized Bicycle Mechanical Components
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Sticky threads
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The Basics, Port & Polish and Port Matching
BarelyAWake
Mar 20, 2010
3
4
5
Replies
98
Views
126,151
Jul 15, 2015
Porting newb
P
Normal threads
Transfer Port Modification- Pictures and results here.
Bikeguy Joe
Feb 5, 2009
10
11
12
Replies
238
Views
106,546
Mar 19, 2019
javy mcdees
New Slant Heads for 80cc's: Compression Boost!?
europorsche914
Mar 10, 2009
10
11
12
Replies
237
Views
58,723
May 9, 2011
greentek
G
Puch head on a 66cc HT bicycle engine with 6mm studs
maurtis
May 17, 2012
6
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8
Replies
147
Views
37,982
Mar 23, 2013
maniac57
Poll
liquid cooled ht bicycle engine
flybytaco
Jul 20, 2010
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6
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105
Views
39,470
Jun 5, 2015
dtv5403
D
slant head dead
wezwheels
Jul 14, 2010
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4
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74
Views
12,265
Dec 31, 2010
Sideshowbob
T
wristpin needle bearing question
Thunderhead289
Mar 3, 2014
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4
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70
Views
21,109
Feb 27, 2015
Davezilla
H
Puch Moped Head on HT 67cc bicycle engine- thanks Foureasy!
huckersteve
Aug 15, 2010
2
3
Replies
57
Views
22,694
Aug 9, 2012
Kristof
GT5 small port cylinder pics
mapbike
Feb 11, 2015
2
3
Replies
56
Views
14,172
Apr 26, 2016
exokinetic
whats wrong... pls help...
virtuoso
Apr 22, 2015
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3
Replies
56
Views
9,529
May 9, 2015
mapbike
Thoughts on the "slant plug head"
Pablo
May 26, 2009
2
3
Replies
48
Views
13,521
Jun 6, 2009
Goat Herder
head gasket questions
mechanickid
Dec 29, 2008
2
3
Replies
47
Views
8,507
Feb 21, 2009
mechanickid
New cylinder type
lewdog7431
Nov 9, 2019
2
3
Replies
46
Views
10,165
Jan 17, 2020
kelly dean
Custom Billet Head... I haven't seen this one
mapbike
Jun 27, 2013
2
3
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45
Views
12,047
Jan 10, 2015
Flyman
F
S
34 tooth swap, down hill, new personal best!
StevenMain
Aug 12, 2016
2
3
Replies
43
Views
7,948
Aug 22, 2016
StevenMain
S
F
Slant cylinder head vs. strait cylinder head
Frogster
Jan 18, 2013
2
3
Replies
43
Views
12,067
Apr 29, 2013
chevelle454
C
billet head- very nice!
bluenosegoat
Oct 10, 2010
2
3
Replies
42
Views
8,697
Nov 1, 2010
bluenosegoat
why to not use a slant head...
LS614
Mar 7, 2011
2
3
Replies
42
Views
14,927
Mar 24, 2011
Goat Herder
Notched Cooling Fins?
mogollonmonster
Sep 11, 2015
2
3
Replies
41
Views
9,853
Oct 8, 2015
Davezilla
Piston mods and weight difference of pistons etc...
mapbike
Apr 18, 2014
2
3
Replies
41
Views
10,198
Jul 22, 2014
woogie_man
W
F
A Question to Ponder
FlyGuy
Apr 3, 2011
2
3
Replies
40
Views
7,521
Apr 23, 2011
DaveC
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Motorized Bicycle Mechanical Components
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