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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
123,648
Jul 15, 2015
Porting newb
P
Normal threads
How much piston skirting to remove?
Denis Zen
Sep 26, 2021
Replies
4
Views
1,723
Oct 28, 2023
Wevil Kenevil
G
Modified piston and fredhead
graydog8josh
May 4, 2014
Replies
8
Views
3,392
Aug 24, 2023
WEEDHOPPER
W
M
Liquid cooled 50mm stud spacing
Mossy
Apr 18, 2023
Replies
4
Views
1,439
Jun 6, 2023
Mossy
M
S
Please Help with piston rings
sergman89
Feb 22, 2015
Replies
15
Views
11,749
Jul 18, 2022
Mossy
M
R
What would have caused this scarring on the cylinder wall?
Rexx Shyt
Jun 5, 2022
Replies
9
Views
1,481
Jun 5, 2022
Rexx Shyt
R
R
Poor mans "port and polish"
Rexx Shyt
Jun 5, 2022
Replies
2
Views
1,007
Jun 5, 2022
Rexx Shyt
R
W
What crankshaft do I need
WEEDHOPPER
May 18, 2022
Replies
6
Views
2,103
May 18, 2022
WEEDHOPPER
W
head gap. help!
meatgrinder
Jun 24, 2013
2
Replies
38
Views
10,635
May 15, 2022
Venice Motor Bikes
Base Spacer
Chad_Broski
Apr 21, 2022
2
Replies
33
Views
4,368
May 12, 2022
Greg58
Noob Question
Chad_Broski
Apr 13, 2022
Replies
17
Views
1,747
May 6, 2022
Chad_Broski
J
What happend here?
JuraTykkt
Mar 20, 2022
Replies
3
Views
954
Mar 22, 2022
Greg58
Porting cylinder, hitting 8500+ rpm
Backwoods1989
Dec 15, 2021
Replies
0
Views
1,781
Dec 15, 2021
Backwoods1989
Super tight squish for cleaner burn
Backwoods1989
Nov 27, 2021
Replies
0
Views
1,569
Nov 27, 2021
Backwoods1989
K
New gt5 motor ring on head causes huge gap!!
Kylechavis585
Sep 17, 2021
Replies
1
Views
596
Sep 17, 2021
Venice Motor Bikes
M
CDHpower head review
mountain80
Aug 31, 2021
Replies
5
Views
1,455
Aug 31, 2021
mountain80
M
J
dio reed porting results
jrok96
Nov 18, 2018
Replies
5
Views
3,191
Aug 28, 2021
mountain80
M
Clearance to plug
Jett40
Aug 28, 2021
Replies
7
Views
1,254
Aug 28, 2021
Jett40
J
Question about the Head gasket
jyomaa
Aug 20, 2021
Replies
8
Views
2,819
Aug 28, 2021
jyomaa
J
Are CDH Power performance heads any good?
BenchDweller
Jan 24, 2020
Replies
1
Views
1,880
Aug 28, 2021
mountain80
M
G
New bike kit and cylinder head cracked
Gunner135
Aug 12, 2021
Replies
0
Views
616
Aug 12, 2021
Gunner135
G
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Motorized Bicycle Mechanical Components
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