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Genuine Yamaha OEM Yamaha Engine Parts
O&H Replacement Parts
Aftermarket Pistons & Rings
Yamaha Gaskets
Other Yamaha Engine Parts
Model Description Sell
KT100BP_S Yamaha 100cc Sandor Blueprinted Yamaha
Click picture for engine details.
$1450.00
KT100BP_HJ Yamaha 100cc Hi-Jack Blueprinted Yamaha
Includes Carb and pocketed main bearings.
$1130.00
KT100SE Yamaha 100cc Yamaha Piston Port Kart Engine
Photo & Specifications

List price $739.00
$645.00
It may take a few seconds for the schematics to load...
Spark Plug Head Nut Head Washer Cylinder Head Head Gasket Stud, cylinder Nut, cylinder Cylinder (aka JUG) Base Gasket (.032" is standard in a new engine)
Genuine Yamaha
Thrust Washer for bottom guided engine (2 reqd) Ring Piston Cir clip Cir clip Piston Pin (aka wrist pin) Upper rod bearing Thrust Washer for top guided engine Thrust washer for top guided engine ignition key Connecting Rod Lower Rod Bearing Crank Pin Crank Pin Plugs (2 reqd) Crank Assembly Crank Half RH Crank Half LH Main Bearing Main Bearing Oil Seal Oil Seal Nut, ignition rotor
Click here for Yamaha exhaust systems Stud Gasket Nut
Genuine Yamaha
Case Bolts Ignition Cover Stud, case Stud, case Pulse Nipple Dowell Pin Cases Bolt, ignition cover Lock Washer, ignition cover
Spark Plug Boot Kill Button Kill Wire TCI Box Rotor Stator (Coil) boltstator To Walbro Carb Page Return Spring Mainfold, aluminum Phoenolic Spacer Stud, Carb Pulse Hose Spacer Gaskets Carb Gasket Nut, carb
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
Piston, Factory Coated
Aftermarket Pistons are also available: Burris & KSI
45.12 42.86
Swain Coated OEM Piston 63.00 51.53
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 Engines
Aftermarket 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
"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
"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 Bearing
BEST 
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
"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
"Cast" Ring from O&H
Tech tip. Use a +.10mm oversize ring
Example: 52.50 piston = 52.60 ring
12.50 9.38


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
Burris Piston & Ring -- "Black Box" 46.94 25.00
Burris 2 Ring Piston & Rings 56.44 30.00
KSI Piston 43.84 31.13
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:
.032" Thick Gasket
.005" Thick Gasket
.010" Thick Gasket
 
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
Part# Description List Sell
 
H754000
H754100
Head Washers, Tool Steel
6 pieces
100 pieces
 
7.04
97.97
 
5.28
73.48
H724400 Upper Washers -- Tool Steel
Fits KSI pistons.
24.13 18.10
RR BMB Barden Main Bearing - Angular Contact
205H - for use with crank saver sleeves
110.00 77.00
PK 310 Flywheel Nut - Aluminum 3.00 3.00
RLV 2014 Compatible TCI Box 54.61 40.96
KM 204 Aluminum TCI Hold-Down Box
Protect that expensive TCI Unit!
10.45 9.41

Rieken's Racing rebuilds any Yamaha KT100S engine.  Please email for details.
Need helping finding something?  Email us.  We will be glad to help.

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Rieken's Racing (319)373-2018      365 7th Ave Marion, IA 52302


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