The World's Largest Supplier of Pattern R/C Products

Hex & Ball-Hex Drivers
Tech Info call 1-406-259-9004  +  To Order Call 1-800-723-5937  +  Monday thru Saturday 10-6 MST
This is an Exploded View of the YS 91-AC  
 

 

Please select your part and click on its number.  The part information you clicked on will appear
at the top of the page, or you may go directly to the table below for
part # and description before ordering.

Ys91acex.jpg (139278 bytes)

Parts Table for YS 91AC

# Part # Description Qty Price
1 YS1570 YS91AC Crankcase 1

Discontinued

2 YS1581 YS91AC Cylinder Head 1
115.50
3 YS1590 YS91AC Intake Valve 1
15.75
4 YS1600 YS91AC Exhaust Valve 1
14.25
5 YS0540 Valve Spring Set 2
6.25
6 YS2030 YS91AC Spring Retainer Set 2
5.75
7 YS2040 YS91AC Valve Spring Retainer Clips 4
5.75
8 YS1611 YS91AC Cylinder Head Gasket 1
3.95
9 YS1220 Drive Washer Spacer 1
3.10
10 YS1621 YS91AC Cylinder Liner (early version, YS1620 discontinued) 1
38.25
11 YS1630 YS91AC Head Screws 4
4.25
12 YS1640 YS91AC Valve Cover 1
11.50
13 YS1650 YS91AC Valve Cover Gasket (available in set, YSO2020) 1  
14 YS1660 YS91AC Valve Cover Screws 2
2.95
15 YS1670 YS91AC Rear Air Chamber 1
12.95
16 YS1680 YS91AC Air Chamber Gasket (available in set, YSO2020) 1  
17 YS1690 YS91AC Air Chamber Screws 2
4.25
18 YS1700 YS91AC Air Chamber O-Ring (available in set, YSO2090) 1  
19 YS1710 YS91AC Crankshaft  

DISCONTINUED  ITEM
20 YS1720 YS91AC Rear Bearing 1
15.95
21 YS0695 Front Bearing 1
12.25
22 YS1730 YS91AC Front Bearing Oil Seal 1
8.50
23 YS1740 YS91AC Drive Washer  

DISCONTINUED  ITEM
24 YS1750 YS91AC Shaft Key 1
2.95
25 YS0425 Propeller Washer 1
2.50
26 YS0830 Propeller Nut Set 2
7.75
27 YS1760 YS91AC Piston 1
35.95
28 YS1770 YS91AC Piston Ring 1
14.25
29 YS1780 YS91AC Wrist Pin 1
7.25
30 YS0610 Wrist Pin Retainer 2
3.10
31 YS1790 YS91AC Rocker Arm Set 2
27.50
32 YS0560 Tappet Adjusting Screw Set 2
6.25
33 YS0565 Tappet Lock Nut 2
3.10
34 YS1800 YS91AC Rocker Arm Shaft 1
7.25
35 YS1810 YS91AC Rocker Arm Screw 1
1.50
36 YS0580 E-Ring Set 2
2.50
37 YS0670 Cam Gear 1
46.25
38 YS1820 YS91AC Cam Gear Cover 1
5.75
39 YS1830 YS91AC Cam Gear Cover O-Ring (available in set, YSO2090) 1  
40 YS1840 YS91AC Cam Gear Cover Screws 2
2.95
41 YS0705 Cam Gear Bearing 2
12.95
42 YS0675 Cam Follower 2
12.25
43 YS1850 YS91AC Push Rods 2
5.50
44 YS1860 YS91AC Push Rod Covers 2
7.25
45 YS0690 Push Rod Cover O-Ring (available in set, YSO2090) 4  
46 YS1870 YS91AC Con Rod 1
20.25
47 YS1880 Back Plate     (only in BP Assembly #YS2100) 1

see #YS2100, bottom of page
48 YS1890 Disc Valve      (only in BP Assembly #YS2100) 1

see #YS2100, bottom of page
49 YS1900 Disc Valve Pin     (only in BP Assembly #YS2100) 1

see #YS2100, bottom of page
50 YS1910 YS91AC Disc Valve Pin Retainer 2
2.95
51 YS1920 YS91AC Disc Valve Pin E-Ring 1
1.50
52 YS1930 YS91AC Back Plate Gasket (available in set, YSO2020) 1  
53 YS1940 YS91AC Back Plate Screws 4
4.25
54 YS1950 YS91AC Carburetor Body 1

Not Available
55 YS1960 YS91AC Throttle Barrel 1
22.95
56 YS2050 YS91AC Low Speed Needle Valve 1
8.50
57 YS2060 YS91AC Low Speed Needle Valve O-Ring (available in set, YSO2090) 1  
58 YS2070 YS91AC Throttle Barrel Seal 1
2.95
59 YS1090 Throttle Barrel Retainer 2
3.10
60 YS0200 Throttle Arm 2
5.50
61 YS0785 Throttle Stop Screw 1
1.50
62 YS0790 Throttle Stop Spring 1
1.50
63 YS0765 Needle Valve     Available in assembly set 1 See Needle Valve Assembly Below
64 YS0770 Needle Socket     Available in assembly set 1 See Needle Valve Assembly Below
65 YS0775 Needle Socket O-Ring 3
3.10
66 YS0385 Needle Detent 1

DISCONTINUED
67 YS1970 YS91AC Carburetor Gasket  (available in set, YSO2020) 1  
68 YS2080 YS91AC Carburetor Screws 2
2.95
69 YS1990 YS91AC Regulator Body 1
34.50
70 YS0195 Regulator Adjusting Screw 1
3.25
71 YS0725 Regulator Adjusting Screw O-Ring (available in set, YSO2090) 1  
72 YS2000 YS91AC Diaphragm 1
2.95
73 YS0176 Plunger 1
3.10
74 YS0180 Plunger Spring 1
1.50
75 YS0750 Regulator Screw 2
1.50
76 YS0710 Fuel Nipple 4
9.25
77 YS2010 YS91AC Muffler 1

Discontinued by YS

Call us for optional

replacement mufflers

1-800-723-5937

  YS2020 YS91AC Gasket Set 1
12.95
  YS2090 YS91AC O-Ring Set 1
12.95
  YS2100 YS91AC Back Plate Assembly 1
65.95
  YS0875 See Needle Valve Assembly Below 4  
  YS0405 Check Valve 1
7.75
  YSE2740 Needle Valve Assembly 1

28.95

Call 1-406-259-9004 For Technical Questions
For Prices and Orders Call:  1-800-723-5937 *M-F 10-8 Sat. 10-6 (MST)

 

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