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Performance Mods
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Motorized bicycle performance modifications. Carbs, porting, exhausts, expansion chambers, reed valves, boost bottles and everything to make your motorized bicycle go really fast.
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Title
S
Locked
Sticky
Top Speed
Snarfu
Jul 8, 2012
32
33
34
Replies
335
Views
107K
Jun 26, 2023
DAMIEN1307
J
Locked
Sticky
jpilot's Gear Ratio Calculator -
jpilot
Nov 20, 2007
Replies
4
Views
16K
Oct 8, 2019
CrazyDan
D
Locked
Sticky
preventing power loss
Deleted member 12676
Jan 12, 2013
2
3
4
Replies
38
Views
26K
Aug 12, 2019
Robert41
R
B
Sticky
Dellorto carby manual
BoltsMissing
May 28, 2011
Replies
2
Views
12K
Jul 17, 2019
Deleted member 12676
D
Q
Locked
Sticky
Re-jetting Your Carb, As Easy As 1,2,3 ( quarkdude )
quarkdude
Jul 24, 2007
2
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4
Replies
38
Views
43K
Dec 20, 2017
quarkdude
Q
W
Dyno testing 'performance mods'
WillitBoost
Aug 15, 2023
58
59
60
Replies
599
Views
11K
Saturday at 10:31 PM
WillitBoost
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Alternator And belt drive
Copygod69
Wednesday at 5:45 PM
2
3
4
Replies
34
Views
279
Friday at 2:21 PM
Copygod69
Jetting pz20 to phantom
Copygod69
Sep 8, 2023
2
3
Replies
22
Views
549
Tuesday at 6:31 PM
Copygod69
Bt80 different jug
Copygod69
Sep 14, 2023
Replies
6
Views
99
Tuesday at 6:19 PM
Copygod69
Nos 49mm iron bore
Copygod69
Sep 16, 2023
2
Replies
14
Views
213
Sep 17, 2023
SirLurksAlot
S
Trimming piston skirt/ porting -polishing / velocity stack mod 🏁👍🏼
Wevil Knievel
Sep 4, 2023
Replies
0
Views
143
Sep 4, 2023
Wevil Knievel
M
Anyone try these? Is it a good deal? (Expansion chamber with muffler)
markjs
Sep 3, 2023
Replies
1
Views
162
Sep 3, 2023
GW's Motorized
DUAL EXPANSION CHAMBER
Jayraye39
Dec 3, 2022
2
3
4
Replies
35
Views
2K
Aug 25, 2023
DAMIEN1307
S
Exhaust for 4strokes
STNY
Aug 25, 2023
Replies
3
Views
230
Aug 25, 2023
GW's Motorized
HHO
Sidewinder Jerry
Jul 31, 2022
2
Replies
19
Views
1K
Aug 25, 2023
GW's Motorized
FREE needle bearing spacers 4 high RPM
Jayraye39
Jan 28, 2023
2
3
4
Replies
37
Views
4K
Aug 13, 2023
Chainlube
Correcting transfer angles, bearing upgrade, and case stuffing
Jayraye39
May 27, 2023
2
3
Replies
21
Views
1K
Aug 13, 2023
Jayraye39
N
Cheapest expansion chambers?
noyo
Aug 9, 2023
Replies
3
Views
310
Aug 9, 2023
GW's Motorized
Very effective DIY velocity stack $15
Jayraye39
Apr 12, 2023
2
Replies
19
Views
2K
Aug 2, 2023
DAMIEN1307
Porting and channeling "hack"
Wevil Knievel
Aug 2, 2023
Replies
0
Views
228
Aug 2, 2023
Wevil Knievel
Phantom 85 pipe suggestions
noah9988
Jul 8, 2023
2
Replies
15
Views
1K
Jul 30, 2023
noah9988
J
Locked
1 piece jug third transfer, boost port, and more
Jug
May 8, 2020
2
3
Replies
21
Views
6K
Jul 17, 2023
DAMIEN1307
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Cylinder head
Whitewill1412
Dec 22, 2022
3
4
5
Replies
42
Views
5K
Jul 14, 2023
Al Regresar
W
2 bikes 2 pipes
Whitewill1412
Jun 22, 2023
4
5
6
Replies
57
Views
2K
Jul 4, 2023
Whitewill1412
W
S
Low HP/cc (comparing to other engines)?
SundayFlyboy97
May 31, 2023
2
Replies
12
Views
1K
Jun 28, 2023
GW's Motorized
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