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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
126,367
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
106,663
Mar 19, 2019
javy mcdees
New Slant Heads for 80cc's: Compression Boost!?
europorsche914
Mar 10, 2009
10
11
12
Replies
237
Views
58,756
May 9, 2011
greentek
G
Poll
liquid cooled ht bicycle engine
flybytaco
Jul 20, 2010
4
5
6
Replies
105
Views
39,487
Jun 5, 2015
dtv5403
D
Puch head on a 66cc HT bicycle engine with 6mm studs
maurtis
May 17, 2012
6
7
8
Replies
147
Views
38,015
Mar 23, 2013
maniac57
T
head torque spec
trackfodder
Apr 2, 2016
Replies
3
Views
24,633
Apr 4, 2016
Venice Motor Bikes
H
Puch Moped Head on HT 67cc bicycle engine- thanks Foureasy!
huckersteve
Aug 15, 2010
2
3
Replies
57
Views
22,760
Aug 9, 2012
Kristof
What's your cylinder head temperature?
biknut
Aug 8, 2011
2
Replies
21
Views
22,608
Jun 11, 2012
fonzie
F
T
wristpin needle bearing question
Thunderhead289
Mar 3, 2014
2
3
4
Replies
70
Views
21,125
Feb 27, 2015
Davezilla
Head bolt torque
Walter F.
Oct 15, 2008
Replies
16
Views
20,541
Mar 15, 2012
motor_bike_fanatic
M
A
head bolt torque
alfred nolet
May 25, 2010
Replies
5
Views
20,393
May 26, 2010
alfred nolet
A
cutting piston skirt... even more??
mew905
Nov 3, 2012
Replies
12
Views
18,988
Apr 27, 2013
Scott.D.Lang
top end mods to stock part for more power !!!
rogergendron1
Oct 12, 2013
2
Replies
21
Views
18,893
Jun 14, 2018
Rstar23
R
P
big bore kit?
PR3C150N
Nov 3, 2010
Replies
3
Views
18,666
Nov 3, 2010
Venice Motor Bikes
Spark Plugs???
Sideshowbob
Jan 8, 2011
Replies
15
Views
18,224
Mar 2, 2013
Trey
R
Reed valve without third transfer port or stuffed cases
Rudz
Jul 14, 2015
Replies
16
Views
17,835
Feb 9, 2018
Venice Motor Bikes
How to remove governor and oil sensor on Predator 212
breath_easy13
Jan 6, 2020
Replies
2
Views
17,551
Jan 6, 2020
breath_easy13
grubee gt5 cylinder differant port map than others ???
rogergendron1
Dec 26, 2013
2
Replies
27
Views
16,629
Jun 16, 2015
Springfieldscooter
V
horsepower
vasago
Sep 3, 2015
Replies
15
Views
16,118
Jan 4, 2016
sbest
all the high comp heads ... witch one do you like best ?
rogergendron1
Oct 9, 2013
2
Replies
24
Views
15,335
Jan 19, 2015
mapbike
Engine head bolts-ARE YOU KIDDING?
Prasinos
Oct 30, 2009
Replies
14
Views
14,984
Nov 1, 2009
Scotchmo
S
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Motorized Bicycle Mechanical Components
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