Accessories
Air Filters
Apparel
Axles
American
Metric
Axle Bearings
American
Metric
Belt Drivers
Bodywork
Brakes
Cams
Carbs
Catch Cans
Chain
Chain Breakers
Chain Guards
Cleaners
Closeout
Clutches
Engines
Engine Parts
Exhaust Page
Fuel Line
Fuel Pumps
Fuel Tanks
Gauges
Gloves
Hardware
Helmets
HPV Parts
ICA / ICC
Jackshafts
Karts
Kart Stands
Lock Collars
American
Metric
Lubricants
Manuals
Minibikes
Mounts
Nerf Bars
New Products
Numbers
Oils
Pedals
Plug Wires
Racewear
Safety Wire
Scales
Seats
Shifters
Shoes
Spark Plugs
Specials
Spindles
Sprockets
Sprocket Hubs
Starters
Starter Nuts
Steering Components
Suits
TaG
Throttle Cables
Tie Rods
Tire Prep
Tires
Tools
Tubes
Weight Tanks
Wheels
Wheel Hubs
Used
It may take a few seconds for the schematics to
load...
KT100S Replacement Parts
O.E.M. Yamaha KT100S Engine Parts
Part#
Description
List
Sell
131-11633-00
Yamaha Piston Pin Aftermarket Piston Pin also available.
7.75
6.20
50W-11651-00
Rod,
Connecting -- "Light Weight"
44.26
35.41
7F6-11651-02
Rod,
Connecting -- "Medium Weight"
55.18
44.14
7F6-15411-02
Cover,
Ignition
34.30
27.44
7F6-22310-01
Chain
Guard, Plastic
24.66
18.50
787-15100-04
Crankcase Assembly
339.30
271.44
7F6-85510-01
Stator -- (ignition coil)
149.92
127.43
7F6-85540-01
C.D.I. unit Aftermarket TCI Unit also available.
128.58
115.72
7F6-85551-01 7F6-85551-51
Rotor -- Igintion: CCW Rotation
= Stock Configuration CW Rotation = Reversed Engine Configuration
143.19 126.34
114.55 107.39
7YA-13552-00
Pulse Nozzle
3.12
2.65
7YB-11400-10
Crank Shaft
Assembly
382.83
306.26
7YA-11412-10
Crank Half, LH
(ignition side)
142.20
113.76
7YB-11422-10
Crank Half, RH
(clutch side)
160.84
128.67
787-11422-01
Crank Half ,PTO for Old Straight Shaft engine This is a vintage engine item.
86.81
69.45
787-11111-04
Head
216.56
184.08
7YA-11161-00 7YA-11162-00
Absorbers : Absorber, Head Absorber, Cylinder
8.42 5.04
6.74 4.03
787-11311-02
Cylinder
320.91
272.77
7YG-11631-00-97 = 51.97
7YG-11631-00-99 = 51.99
7YG-11631-00-00 = 52.00
7YG-11631-10-05 = 52.05
7YG-11631-10-10 = 52.10
7YG-11631-10-15 = 52.15
7YG-11631-10-20 = 52.20
7YG-11635-00-00 = 52.25
7YG-11635-10-30 = 52.30
7YG-11635-10-35 = 52.35
7YG-11635-10-40 = 52.40
7YG-11635-10-45 = 52.45
7YG-11636-00-00 = 52.50
7YG-11636-10-55 = 52.55
7YG-11636-10-60 = 52.60
7YG-11636-10-65 = 52.65
7YG-11636-10-70 = 52.70
7YG-11637-00-00 = 52.75
Piston, Factory Coated Aftermarket Pistons are also available: Burris & KSI
45.12
42.86
RRCYP98 =51.98
RRCYP25 =52.25
RRCYP35 =52.35
RRCYP45 =52.45
RRCYP50 =52.50
RRCYP55 =52.55
RRCYP65 =52.65
RRCYP70 =52.70
RRCYP75 =52.75
Swain Coated OEM Piston
63.00
51.53
7YF-11611-C0 = 52.10
7YF-11611-D0 = 52.15
7YF-11611-F0 = 52.20
7YF-1161A-00 = 52.25
7YF-1161A-A0 = 52.30
7YF-1161A-B0 = 52.35
7YF-1161A-C0 = 52.40
7YF-1161A-D0 = 52.45
7YF-1162A-00 = 52.50
7YF-1162A-A0 = 52.55
7YF-1162A-B0 =52.60
7YF-1162A-C0 = 52.65
7YF-1162A-D0 = 52.70
7YF-1163A-00 =52.75
Yamaha Piston Ring Tech tip. Use a +.10mm oversize ring Example: 52.50 piston = 52.60 ring Aftermarket Rings are also available: Burris & Gold
26.46
21.17
90468-12N00
Cir
Clip -- Earless Aftermarket Spiral Lock Clips also available.
1.54
1.23
93450-15023
Cir Clip - Single Ear
1.43
1.14
7F6-11641-00
Aluminum Washer, Rod - Top For
top guided engines only.
9.37
7.50
787-11681-00
Crank Pin
17.21
13.77
787-15385-00
Plug -- Crank Pin
7.46
5.97
787-13585-00
Manifold , Aluminum
36.10
28.88
787-13586-00
Phoenolic Spacer
9.37
7.50
789-11181-00
Gasket, Head (.032") Aftermarket head gaskets are also available.
6.74
5.39
796-82550-09
Kill Button Switch
29.76
23.81
7YB-82521-00
Wire, Lead (Kill Button
Wire)
2.05
1.64
89A-14613-00
Gasket, Exhaust
4.13
3.30
90110-06138
Screw
2.20
1.76
90116-06N06
Stud, Carb
3.86
3.09
90119-06063
Bolt with Washer
0.85
0.68
90170-08N00
Nut, Head
5.52
4.42
90201-08087
Washer, Head Nut
0.86
0.69
90179-08N15
Nut, Cylinder
5.83
4.66
90179-12N01
Nut, Rotor
5.52
4.42
90209-20159
Washer -
Rod, Bottom
(lower cage washers) For
bottom guided engines SOLD
INDIVIDUALLY
4.38
3.50
90504-09027
Spring, Return Carb
3.77
3.02
91317-05020
Bolt, Stator
0.67
0.57
91317-06025
Bolt, Ignition Cover
0.97
0.78
91317-06012
Bolt, Starter Cup
0.64
0.51
91317-06045
Bolt, Cases
1.95
1.56
91317-06060
Bolt, Cases
1.95
1.56
91317-08025
Bolt, Engine Mount
1.19
0.95
92907-06100
Lock Washer,
Ignition Cover
0.45
0.36
90462-08042
Clamp,
Coated -- Ignition Wire Retention
4.45
3.56
90468-20074
Clip,
Wire -- Spark Plug Wire Retention
3.89
3.11
90480-14198
Grommet,
Ignition Cover -- Round Style w/ hole
3.16
2.69
90480-18N09
Grommet,
Ignition Cover -- Round Style, no hole
3.16
2.69
90480-16N08
Grommet,
Ignition Cover -- Flat Style
3.37
2.70
93102-20N03
Oil Seal Aftermarket oil seals are also available.
11.18
8.94
93306-20468
Main Bearing - (fits Komet K55) 6204C4
17.76
15.10
93306-30442
Main
Bearing -- Yamaha KT100S Aftermarket main bearings are also available.
17.76
15.10
93310-214T1
Upper Rod Bearing For
Bottom Guided EnginesAftermarket upper bearings are also available.
20.20
16.16
93310-21403
Upper Rod Bearing For
Top Guided Engines
9.86
8.38
93310-320T3
Lower Rod Bearing For
Bottom Guided Engines Thompson Lower Rod Bearing also available.
23.69
18.95
93310-420F6
Lower Rod Bearing For
Top Guided Engines
30.10
24.08
93606-20044
Pin, Dowell
0.85
0.68
95617-06100
Nut, Carb
0.86
0.69
95617-08325
Stud, Exhaust
2.59
2.07
95617-08640
Stud, Cylinder
3.34
2.67
95617-08645
Stud, Case
3.86
3.09
99780-08600
Nut, Exhaust
0.57
0.51
98907-06016
Screw
0.73
0.58
O&H Replacement Parts
Part#
Description
List
Sell
OH YRGD05 =52.05
OH YRGD10 =52.10
OH YRGD20 =52.20
OH YRGD30 =52.30
OH YRGD40 =52.40
OH YRGD50 =52.50
OH YRGD60 =52.60
OH YRGD70 =52.70
OH YRGD80 =52.80
OH YRGD90 =52.90
"Gold" Ring
THE BEST
RING ON THE MARKET Tech tip. Use a +.10mm oversize ring Example: 52.50 piston = 52.60 ring
29.70
22.28
OH OHYR10 =52.10
OH OHYR20 =52.20
OH OHYR30 =52.30
OH OHYR40 =52.40
OH OHYR50 =52.50
OH OHYR60 =52.60
OH OHYR70 =52.70
OH OHYR80 =52.80
OH OHYR90 =52.90
"Cast" Ring Tech tip. Use a +.10mm oversize ring Example: 52.50 piston = 52.60 ring
12.50
9.38
OH LWP
"Lite" Piston
Pin
11.90
8.93
OH RCS
Spiral Lock Clips (2pcs.)
2.40
2.28
OH WPB7
Upper Bearing
BEST bottom guided - all
engines
16.40
12.30
OH WPWLR
Top Cage Washer
(for loose rollers)
8.00
6.00
OH WPB4
Loose Rollers (25 per pack)
6.61
4.95
OH CRB5
Thompson Lower BearingBEST
bottom guided
37.80
28.35
OH CPY
Crank Pin - Solid (No plug style)
17.80
13.35
OH SGY
GOLD Teflon Oil Seal
7.90
5.93
OH MB6304
Main Bearing -- 6304 C4 (SKF brand)
Standard size for KT100S
13.90
10.43
OH MB1304
Main Bearing -- 1304 C4 (RHP brand)
Standard size for KT100S but DOUBLE ROW
43.00
32.25
OH MB6205
Main Bearing -- 6205 C4 (FAG brand)
Use this bearing when crank sleeves are installed.
13.90
10.43
OH MB1205
Main Bearing -- 1205 C4 (NTN brand)
Same as 6205C4 but DOUBLE ROW
43.00
32.25
OH CSK
Crank Saver Kit
Includes 2 each: 6205 C4 bearings, sleeves & pins
80.00
60.00
OH CSS
Sleeve,
individual for Crank Saver Kit
29.00
21.75
OH CSP
Dowell Pin,
each for crank saver kit
2.00
1.50
OH PH
Pulse Line Hose
3/16" ID (per foot)
Standard size for use with Walbro WB3A carb
2.00
1.50
OH PH8
Pulse Line Hose
1/8" ID (per foot)
For use with Walbro WA55B carb
2.00
1.50
Aftermarket Yamaha Pistons & Rings
Part#
Description
List
Sell
OH YRGD05 =52.05
OH YRGD10 =52.10
OH YRGD20 =52.20
OH YRGD30 =52.30
OH YRGD40 =52.40
OH YRGD50 =52.50
OH YRGD60 =52.60
OH YRGD70 =52.70
OH YRGD80 =52.80
OH YRGD90 =52.90
"Gold" Ring from O&H
THE BEST
RING ON THE MARKET Tech tip. Use a +.10mm oversize ring Example: 52.50 piston = 52.60 ring
29.70
22.28
OH OHYR10 =52.10
OH OHYR20 =52.20
OH OHYR30 =52.30
OH OHYR40 =52.40
OH OHYR50 =52.50
OH OHYR60 =52.60
OH OHYR70 =52.70
OH OHYR80 =52.80
OH OHYR90 =52.90
"Cast" Ring from O&H Tech tip. Use a +.10mm oversize ring Example: 52.50 piston = 52.60 ring
12.50
9.38
BMC20700 =52.00/52.05
BMC20710 =52.10/52.15
BMC20720 =52.20/52.25
BMC20730 =52.30/52.35
BMC20740 =52.40/52.45
BMC20750 =52.50/52.55
BMC20760 =52.60/52.65
BMC20770 =52.70/52.75
BMC20780 =52.80/52.85
BMC 20800 = 52.00
BMC 20805 = 52.05
BMC 20810 = 52.10
BMC 20815 = 52.15
BMC 20820 = 52.20
BMC 20825 = 52.25
BMC 20830 = 52.30
BMC 20835 = 52.35
BMC 20840 = 52.40
BMC 20845 = 52.45
BMC 20850 = 52.50
BMC 20855 = 52.55
BMC 20860 = 52.60
BMC 20865 = 52.65
BMC 20870 = 52.70
BMC 20875 = 52.75
BMC 20880 = 52.80
BMC 20885 = 52.85
BMC 20800WR = 52.00
BMC 20805WR = 52.05
BMC 20810WR = 52.10
BMC 20815WR = 52.15
BMC 20820WR = 52.20
BMC 20825WR = 52.25
BMC 20830WR = 52.30
BMC 20835WR = 52.35
BMC 20840WR = 52.40
BMC 20845WR = 52.45
BMC 20850WR = 52.50
BMC 20855WR = 52.55
BMC 20860WR = 52.60
BMC 20865WR = 52.65
BMC 20870WR = 52.70
BMC 20875WR = 52.75
BMC 20880WR = 52.80
BMC 20885WR = 52.85
Burris Yamaha Piston & Rings
Ring Only (#BMC 207)
Piston "Red Box" Only (#BMC 208)
Piston and Ring (#BMC 208WR)
Click here for more information on this product.
11.25 32.20 43.45
10.13 31.05 40.35
BMC 20840B = 52.40
BMC 20850B = 52.50
Burris Piston & Ring -- "Black Box"
46.94
25.00
BMC 20410 = 52.10
BMC 20415 = 52.15
BMC 20420 = 52.20
BMC 20435 = 52.35
Burris 2 Ring Piston & Rings
56.44
30.00
KSIP05 = 52.05
KSIP10 = 52.10
KSIP15 = 52.15
KSIP20 = 52.20
KSIP25 = 52.25
KSIP30 = 52.30
KSIP35 = 52.35
KSIP40 = 52.40
KSIP45 = 52.45
KSIP50 = 52.50
KSIP55 = 52.55
KSIP60 = 52.60
KSIP65 = 52.65
KSIP70 = 52.70
KSIP75 = 52.75
KSIP80 = 52.80
KSIP85 = 52.85
KSIP90 = 52.90
KSI Piston
43.84
31.13
KSIR00 = 52.00
KSIR05 = 52.05
KSIR10 = 52.10
KSIR15 = 52.15
KSIR20 = 52.20
KSIR25 = 52.25
KSIR30 = 52.30
KSIR35 = 52.35
KSIR40 = 52.40
KSIR45 = 52.45
KSIR50 = 52.50
KSIR55 = 52.55
KSIR60 = 52.60
KSIR65 = 52.65
KSIR70 = 52.70
KSIR75 = 52.75
KSIR80 = 52.80
KSIR85 = 52.85
KSIR90 = 52.90
KSIR95 = 52.95
KSI Ring
20.28
14.40
KT100S Gaskets
Part#
Description
List
Sell
HG05-Y HG10-Y HG12-Y HG15-Y HG20-Y HG32-Y HG40-Y
Copper Head Gaskets : .005" thick .010" thick .012" thick .015" thick .020" thick .032" thick .040" thick
5.76 2.68 2.68 4.00 4.14 5.04 5.04
4.90 2.28 2.28 3.40 3.52 4.28 4.28
789-11181-00
OEM Copper Head Gasket -- .032" thick
6.74
5.39
FPS10007 FPS10008 FPS10009
Fel-Pro Silicone Coated Copper Head Gaskets:
11.61 9.12 12.13
7.78 6.11 8.13
LS 80-05B LS 80-10B LS 80-15B LS 80-20B LS 80-32B
Paper Base Gaskets : .005" thick .010" thick .015" thick .020" thick .032" thick
2.50 3.60 3.60 3.60 3.60
1.75 2.00 2.00 2.00 2.00
LS 80-10AB
Base
Gasket, Aluminum .010"
5.00
3.50
LS 80-05C LS 80-10C LS 80-15C LS 80-20C
Paper Case Gaskets : .005" thick .010" thick .015" thick .020" thick
3.60 3.60 3.60 3.60
2.00 2.00 2.00 2.00
FPS62011
Fel-Pro Base
Gasket, Paper -- .010" Sold in 10 packs only
16.89
11.32
FPS62012
Fel-Pro Base
Gasket, Paper -- .005" Sold in 10 packs
only
16.89
11.32
89A-14613-00
Exhaust Gasket (OEM)
4.13
3.30
FPS30007
Fel-Pro Carb
Intake Gasket Coated Kevlar Paper with
P.O.S. -- With Seal .020" thick Click here for More Carb Gaskets.
7.05
4.72
Other Yamaha Engine
Accessories & Parts
Rieken's Racing rebuilds any Yamaha KT100S engine.
Please email for details.
Need helping finding something? Email us.
We will be glad to help.
Orders | Back
to the Engine Page | Back to the Catalog | Rieken's
Racing
Rieken's Racing (319)373-2018 365
7th Ave Marion, IA 52302
©2001-2007 Rieken's Racing All Rights
Reserved
Legals
Prices
and Availability subject to change without notice
Website designed & maintained by Rieken's Racing