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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
129,821
Jul 15, 2015
Porting newb
P
Normal threads
Headless yd100
Wevil Kenevil
Apr 21, 2024
Replies
2
Views
1,472
Sep 25, 2024
Wevil Kenevil
Gap in Head Cylinder
Cycleized
Oct 13, 2012
Replies
11
Views
4,311
Mar 24, 2024
wrench
How much piston skirting to remove?
Denis Zen
Sep 26, 2021
Replies
4
Views
2,967
Oct 28, 2023
Wevil Kenevil
G
Modified piston and fredhead
graydog8josh
May 4, 2014
Replies
8
Views
3,924
Aug 24, 2023
WEEDHOPPER
W
M
Liquid cooled 50mm stud spacing
Mossy
Apr 18, 2023
Replies
4
Views
1,968
Jun 6, 2023
Mossy
M
S
Please Help with piston rings
sergman89
Feb 22, 2015
Replies
15
Views
12,999
Jul 18, 2022
Mossy
M
R
What would have caused this scarring on the cylinder wall?
Rexx Shyt
Jun 5, 2022
Replies
9
Views
2,035
Jun 5, 2022
Rexx Shyt
R
R
Poor mans "port and polish"
Rexx Shyt
Jun 5, 2022
Replies
2
Views
1,343
Jun 5, 2022
Rexx Shyt
R
W
What crankshaft do I need
WEEDHOPPER
May 18, 2022
Replies
6
Views
2,821
May 18, 2022
WEEDHOPPER
W
head gap. help!
meatgrinder
Jun 24, 2013
2
Replies
38
Views
12,081
May 15, 2022
Venice Motor Bikes
Base Spacer
Chad_Broski
Apr 21, 2022
2
Replies
33
Views
5,852
May 12, 2022
Greg58
Noob Question
Chad_Broski
Apr 13, 2022
Replies
17
Views
2,509
May 6, 2022
Chad_Broski
J
What happend here?
JuraTykkt
Mar 20, 2022
Replies
3
Views
1,256
Mar 22, 2022
Greg58
Porting cylinder, hitting 8500+ rpm
Backwoods1989
Dec 15, 2021
Replies
0
Views
2,185
Dec 15, 2021
Backwoods1989
Super tight squish for cleaner burn
Backwoods1989
Nov 27, 2021
Replies
0
Views
1,917
Nov 27, 2021
Backwoods1989
K
New gt5 motor ring on head causes huge gap!!
Kylechavis585
Sep 17, 2021
Replies
1
Views
849
Sep 17, 2021
Venice Motor Bikes
M
CDHpower head review
mountain80
Aug 31, 2021
Replies
5
Views
1,999
Aug 31, 2021
mountain80
M
J
dio reed porting results
jrok96
Nov 18, 2018
Replies
5
Views
3,646
Aug 28, 2021
mountain80
M
Clearance to plug
Jett40
Aug 28, 2021
Replies
7
Views
1,678
Aug 28, 2021
Jett40
J
Question about the Head gasket
jyomaa
Aug 20, 2021
Replies
8
Views
3,690
Aug 28, 2021
jyomaa
J
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Motorized Bicycle Mechanical Components
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