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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
106,698
Jul 15, 2015
Porting newb
P
Normal threads
D
New to forum have head issues. I just had a leak in the upper head kill my motor.
Dumbass on a bike
Feb 16, 2021
Replies
3
Views
177
Feb 16, 2021
wrench
K
Connecting for Phatmoto
Kuda
Feb 7, 2021
Replies
2
Views
211
Feb 13, 2021
Kuda
K
T
Yd100 piston & jug issue!
TheEvilCareBear
Feb 5, 2021
Replies
0
Views
182
Feb 5, 2021
TheEvilCareBear
T
H
Blown head gasket
hogue676
Nov 20, 2020
Replies
2
Views
817
Nov 20, 2020
curtisfox
C
Robin Subaru EH 035 Valve Adjustments
Sidewinder Jerry
Oct 14, 2020
Replies
0
Views
412
Oct 14, 2020
Sidewinder Jerry
Differnt sized spark plug holes in cnc cylinder heads
stevennf94
Oct 5, 2020
Replies
0
Views
203
Oct 5, 2020
stevennf94
Bottom end leaking oil
Tom74
Jul 19, 2020
Replies
2
Views
568
Jul 19, 2020
Tom74
N
Bad cylinder scoring.
Niksan258
Jul 12, 2020
Replies
1
Views
289
Jul 12, 2020
Bikeguy Joe
Cylinder Head Lapping Question
rohmell
May 14, 2011
Replies
18
Views
7,668
Mar 30, 2020
kelly dean
A
3rd transfer port plz help
Adam E
Mar 20, 2020
Replies
9
Views
1,615
Mar 20, 2020
Adam E
A
Are CDH Power performance heads any good?
BenchDweller
Jan 24, 2020
Replies
0
Views
536
Jan 24, 2020
BenchDweller
New cylinder type
lewdog7431
Nov 9, 2019
2
3
Replies
46
Views
3,842
Jan 17, 2020
kelly dean
How to remove governor and oil sensor on Predator 212
breath_easy13
Jan 6, 2020
Replies
2
Views
4,724
Jan 6, 2020
breath_easy13
heads and cylinders after 3000 miles
javy mcdees
Jun 7, 2019
Replies
9
Views
1,113
Sep 28, 2019
javy mcdees
J
oil on top of cylinder head
Jurney
Sep 23, 2019
Replies
2
Views
658
Sep 24, 2019
Jurney
J
What Compression Reading Should I Get?
exokinetic
Apr 24, 2016
Replies
7
Views
6,081
Sep 8, 2019
lewdog7431
A
Scratched cylinder and piston?
Alberto Gaytán Martínez
May 3, 2019
Replies
4
Views
904
May 4, 2019
Greg58
what size cc now
chmn22s
Sep 24, 2018
Replies
3
Views
907
Apr 23, 2019
chmn22s
R
Cylinder Porting
ronin62715sv
Jul 17, 2018
Replies
7
Views
2,575
Mar 19, 2019
javy mcdees
Transfer Port Modification- Pictures and results here.
Bikeguy Joe
Feb 5, 2009
10
11
12
Replies
238
Views
89,520
Mar 19, 2019
javy mcdees
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Motorized Bicycle Mechanical Components
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