
A
66
67
80
18
21
20
22
23
19
38
34
38
36
35
37
40
42
41
42
39
8
27
27
26
43
24
25
33
33
30
30
28
29
29
31
2
3
10
10
4
28
32
5
6
12
11
13
7
79
78
80
65
50
44
45
49
46
16
17
1
63
51
60
61
62
59
58
54
55
57
56
53
52
64
15
14
15
47
67
73
72
70
68
74
69
71
DETAIL
A
75
76
77
WARRANTY
Strict quality control is implemented by our factory in all phases,
from parts manufactiring to final assembly.
If performance 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 warranty.
1
YS5000
Crankcase
1
YS5005
Cylinder head assy.
2
YS5010
Cylinder head & liner
1
3
YS2810
Intake valve
1
4
YS2815
Exhaust valve
1
5
YS2820
Valve spring set
2
6
YS2030
Spring retainer set
2
7
YS2040
Spring retainer clips
4
8
YS5015
Cylinder gasket
1
10 YS2840
Head screws
4
11 YS2845
Valve cover
1
12 YS2850
Valve cover gasket
1
13 YS2855
Valve cover screws
2
14 YS2860
Intake pipe
1
15 YS2865
Intake pipe O ring
2
16 YS4380
Crankshaft
1
17 YS2875
Rear bearing
1
18 YS2880
Front bearing
1
19 YS2885
Front bearing oil seal
1
20 YS2890
Drive washer
1
21 YS2895
Drive washer retainer
1
22 YS0825
Propeller washer
1
23 YS0830
Propeller nuts
2
24 YS5020
Piston
1
25 YS4390
Piston ring
1
26 YS4395
Wrist pin
1
27 YS2925
Wrist pin retainer
2
28 YS2930
Rocker arm set
2
29 YS0560
Tappet adjusting screws
2
30 YS0565
Tappet adjusting lock nuts
2
31 YS2935
Rocker arm shaft
1
32 YS2940
Rocker arm screw
1
33 YS0580
E ring set
2
34 YS2945
Cam gear
1
35 YS2950
Cam gear cover
1
36 YS2955
Cam gear cover O ring
1
37 YS4400
Cam gear screws
2
38 YS2960
Cam gear bearing set
2
39 YS2965
Cam follower set
2
40 YS2970
Push rods
2
41 YS2975
Push rod covers
2
42 YS2980
Push rod cover O ring set
4
43 YS2985
Con rod
1
YS4000
Back plate assy.
44 YS2990
Back plate
1
45 YS2995
Disc valve
1
46 YS3000
Disc valve pin
1
47 YS0640
Disc valve set screw
1
49 YS3005
Back plate gasket
1
50 YS3010
Back plate screws
2
YS5090
Carburetor assy.
51 YS3015
Carburetor body
1
52 YS3020
Throttle barrell
1
53 YS3025
Throttle barrell seal
1
54 YS1090
Throttle barrell retainer
1
55 YS0200
Throttle arm set
1
56 YS0785
Throttle stop screw
1
57 YS0790
Throttle stop spring
1
YS3090
Needle valve assy.
58 YS3030
Needle valve
1
59 YS2695
Needle valve O ring
1
60 YS2700
Needle socket
1
61 YS0775
Needle socket O ring set
2
62 YS2710
Needle valve detent
1
63 YS3035
Fuel nipple
1
64 YS4010
Low speed needle valve
1
65 YS4015
Low speed needle valve O ring
1
66 YS3040
Carburetor gasket
1
67 YS3045
Carburetor screws
4
YS5075
Regulator assy.
68 YS5025
Regulator adjusting screw
1
69 YS5030
Regulator adjusting screw O ring
1
70 YS5035
Plunger spring
1
71 YS5040
Plunger
1
72 YS5045
Regulator body A
1
73 YS5050
Diaphram
1
74 YS5055
Regulator body B
1
75 YS5060
Regulator bracket set
1
76 YS5065
Under cover set
1
77 YS5070
Under cover gasket
1
YS3095
Muffler set
78 YS3065
Muffler assy.
1
79 YS3070
Exhaust pipe
1
80 YS3075
Rock nuts
1
YS5080
Gasket set
4
YS5085
O ring set
11
NO.
PART#
DESCRIPTION
QTY
04/03
YS
PERFORMANCE
1295-C Industrial Court Gardnerville, NV89410
Phone: 775-782-4562 Fax: 775-783-8518