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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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The Basics, Port & Polish and Port Matching
BarelyAWake
Mar 20, 2010
3
4
5
Replies
98
Views
126,055
Jul 15, 2015
Porting newb
P
Normal threads
Headless yd100
Wevil Kenevil
Apr 21, 2024
Replies
1
Views
221
Apr 23, 2024
Wevil Kenevil
M
Liquid cooled 50mm stud spacing
Mossy
Apr 18, 2023
Replies
4
Views
1,684
Jun 6, 2023
Mossy
M
R
What would have caused this scarring on the cylinder wall?
Rexx Shyt
Jun 5, 2022
Replies
9
Views
1,705
Jun 5, 2022
Rexx Shyt
R
R
Poor mans "port and polish"
Rexx Shyt
Jun 5, 2022
Replies
2
Views
1,159
Jun 5, 2022
Rexx Shyt
R
W
What crankshaft do I need
WEEDHOPPER
May 18, 2022
Replies
6
Views
2,464
May 18, 2022
WEEDHOPPER
W
Base Spacer
Chad_Broski
Apr 21, 2022
2
Replies
33
Views
5,066
May 12, 2022
Greg58
Noob Question
Chad_Broski
Apr 13, 2022
Replies
17
Views
2,079
May 6, 2022
Chad_Broski
J
What happend here?
JuraTykkt
Mar 20, 2022
Replies
3
Views
1,104
Mar 22, 2022
Greg58
Porting cylinder, hitting 8500+ rpm
Backwoods1989
Dec 15, 2021
Replies
0
Views
1,985
Dec 15, 2021
Backwoods1989
Super tight squish for cleaner burn
Backwoods1989
Nov 27, 2021
Replies
0
Views
1,686
Nov 27, 2021
Backwoods1989
How much piston skirting to remove?
Denis Zen
Sep 26, 2021
Replies
4
Views
2,656
Oct 28, 2023
Wevil Kenevil
K
New gt5 motor ring on head causes huge gap!!
Kylechavis585
Sep 17, 2021
Replies
1
Views
710
Sep 17, 2021
Venice Motor Bikes
M
CDHpower head review
mountain80
Aug 31, 2021
Replies
5
Views
1,647
Aug 31, 2021
mountain80
M
Clearance to plug
Jett40
Aug 28, 2021
Replies
7
Views
1,481
Aug 28, 2021
Jett40
J
Question about the Head gasket
jyomaa
Aug 20, 2021
Replies
8
Views
3,145
Aug 28, 2021
jyomaa
J
G
New bike kit and cylinder head cracked
Gunner135
Aug 12, 2021
Replies
0
Views
714
Aug 12, 2021
Gunner135
G
U
Stuffing a Minarelli Reed space for a Dio Reed build!
user54508
Aug 9, 2021
Replies
0
Views
995
Aug 9, 2021
user54508
U
shaving the piston skirt
Denis Zen
Jul 2, 2021
Replies
2
Views
1,030
Jul 4, 2021
Denis Zen
Customizing/modding the top of the piston
Denis Zen
Jun 19, 2021
Replies
3
Views
1,100
Jun 22, 2021
Denis Zen
R
Wrong piston ring size?
Rusty_Nail
Jun 13, 2021
Replies
0
Views
661
Jun 13, 2021
Rusty_Nail
R
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Motorized Bicycle Mechanical Components
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