User Manual
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WARRANTY
Strict quality control is implemented by our factory in all phases, from parts manufactiring
to final assembly. If performavce deteriorates or a part fails within one year of purchase
due to a manufacturing error,YS will repair or replace the engine at no charge. Warranty
will not cover normal wear.
Should the engine be modified, incorrectly assembled or abused, there will be a normal
charge for parts and labor. The use of four cycle fuel due to low oil content will also void
warrany.
1 YS4890 Crankcase 1
2 YS0505 Valve Cover 1
3 YS0510 Valve Cover Gasket 1
4 YS0515 Valve Cover Screws 2
5 YS2605 Head Gasket 1
6 YS2610 Cylinder Head 1
7 YS2160 Intake Valve 1
8 YS2165 Exhaust Valve 1
9 YS2170 Spring Set 2
10 YS2175 Spring Retainer Set 2
11 YS2180 Spring Retainer Clip Set 4
12 YS0555 Rocker Arm Set 2
13 YS0560 Valve Adjuster Set 2
14 YS0565 Adjuster Nut Set 2
15 YS0570 Rocker Arm Shaft 1
16 YS0575 Shaft Set Screw 1
17 YS0580 E-Ring Clip Set 2
18 YS2615 Head Bolt Set 5
19 YS4900 Crankshaft 1
20 YS2625 Cylinder Liner 1
21 YS2630 Piston 1
22 YS0605 Wrist Pin 1
23 YS2635 Wrist Pin Retainer Set 2
24 YS2640 Piston Ring 1
25 YS2645 Connecting Rod 1
26 Back Plate 1
27 Disc Valve 1
28 Disc Valve Pin 1
29 Retainer screw 1
30 YS0645 Back Plate Gasket 1
31 YS2655 Back Plate Screw Set 6
32 YS0655 Cam Gear Cover 1
33 YS0660 Cam Cover O-Ring 1
34 YS2235 Cam Cover Screw Set 2
35 YS2660 Cam Gear 1
36 YS0675 Cam Followers 2
37 YS2665 Push Rod Set 2
38 YS2670 Push Rod Cover Set 2
39 YS0690 Push Rod Cover O-Ring set 4
40 YS1050 Front Bearing 1
41 YS2240 Front Bearing Oil Seal 1
42 YS0701 Rear Bearing 1
43 YS0705 Cam Bearing Set 2
44 YS0710 Fuel Nipple Set 6
45 YS0715 Regulator Body 1
46 YS0195 Regulator Adjusting Screw 1
47 YS0725 Regulator Adj Screw O-Ring 1
48 YS0730 Diaphragm 1
49 YS0176 Regulator Plunger 1
50 YS0180 Plunger Spring 1
51 YS0745 Regulator Gasket 1
52 YS0750 Regulator Screw Set 2
54 YS4210 Carburetor Body 1
55 YS4920 Throttle Barrel 1
56 YS2050 Low Speed Adjusting Screw 1
57 YS2060 Low Speed O-Ring 1
58 YS2690 High Speed Needle Valve 1
59 YS2695 High Speed Needle O-Ring 1
60 YS2700 High Speed Needle Seat 1
61 YS2705 Needle Seat O-Ring Set 2
62 YS2710 Needle Valve Detent 1
63 YS2255 Throttle Barrel Seal 1
64 YS1090 Throttle Barrel Retainer 1
65 YS0785 Throttle Stop Screw 1
66 YS0790 Throttle Stop Spring 1
67 YS0200 Throttle Arm 1
68 YS2260 Carburetor Gasket 1
69 YS2715 Drive Washer 1
70 YS2720 Drive Washer Retainer 1
FZ140 Sport Parts LIST
71 YS0835 Intake Pipe 1
72 YS0840 Intake Pipe O-Rings 4
73 YS1540 Wrist Pin Access Plug 1
74 YS2270 Propeller Washer 1
75 YS0830 Propeller Nut Set 2
YS2725 Gasket Set
YS2730 O-Ring Set
YS4915 Carburetor Assembly
YS2740 Needle Valve Assembly
YS4905 Back Plate Assembly
YS4925 Muffler set
YS4930 Muffler
YS4345 Exhaust pipe
YS4350 Lock Nuts
# Part# Description QTY
# Part# Description QTY
YS Parts and Service
1370 PORTER DRIVE MINDEN NEVADA 89423
Phone: 775-267-9252 Fax: 775-267-9690
Specifications may be changed without prior notice. 2003/JAN/11