YS 91-FZ Engine Parts -- Exploded View

Select your part and click on its number. The part information will appear at the top of the page,

or you may go directly to the table below for part # and description before ordering.

#	Part #	Description	Qty	Price	Purchase
1	YS1570	Crankcase	1	$42.95
2	YS1581	Cylinder Head	1	$115.50
3	YS1590	Intake Valve	1	$15.75
4	YS1600	Exhaust Valve	1	$14.25
5	YS0540	Valve Spring Set	2	$6.25
6	YS2030	Spring Retainer Set	2	$5.75
7	YS2040	Valve Spring Retainer Clips	4	$5.75
8	YS1611	Cylinder Head Gasket	1	$3.95
9	YS1220	Drive Washer Spacer	1	$3.10
10	YS1621	Cylinder Liner	1	$38.25
11	YS1630	Head Screws	4	$4.25
12	YS1640	Valve Cover	1	$11.50
13	YS1650	Valve Cover Gasket (available in set, YSO2020)	1
14	YS1660	Valve Cover Screws	2	$2.95
15	YS1670	Rear Air Chamber	1	$12.95
16	YS1680	Air Chamber Gasket (available in set, YSO2020)	1
17	YS1690	Air Chamber Screws	4	$4.25
18	YS1700	Air Chamber O-Ring (available in set, YSO2090)	1
19	YS4320	Crankshaft		$61.25
20	YS1720	Rear Bearing	1	$15.95
21	YS0695	Front Bearing	1	$12.25
22	YS1730	Front Bearing Oil Seal	1	$8.75
23	YS4325	Drive Washer	1	$18.75
24	YS4330	Drive Washer Retainer	1	$5.95
25	YS0425	Propeller Washer	1	$2.50
26	YS0830	Propeller Nut Set	2	$7.75
27	YS1760	Piston	1	$35.95
28	YS1770	Piston Ring	1	$14.25
29	YS1780	Wrist Pin	1	$7.25
30	YS0610	Wrist Pin Retainer	2	$3.10
31	YS1790	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	Rocker Arm Shaft	1	$7.25
35	YS1810	Rocker Arm Screw	1	$1.50
36	YS0580	E-Ring Set	2	$2.50
37	YS0670	Cam Gear	1	$46.25
38	YS1820	Cam Gear Cover	1	$5.75
39	YS1830	Cam Gear Cover O-Ring (available in set, YSO2090)	1
40	YS1840	Cam Gear Cover Screws	2	$2.95
41	YS0705	Cam Gear Bearing	2	$12.95
42	YS0675	Cam Follower	2	$12.25
43	YS1850	Push Rods	2	$5.50
44	YS1860	Push Rod Covers	2	$7.25
45	YS0690	Push Rod Cover O-Ring (available in set, YSO2090)	4
46	YS1870	Connecting Rod	1	$20.25
47	YS1880	Back Plate	1	$34.50
48	YS1890	Disc Valve	1	$18.95
49	YS1900	Disc Valve Pin	1	$5.75
50	YS1910	Disc Valve Pin Retainer	2	$2.95
51	YS1920	Disc Valve Pin E-Ring	1	$1.50
52	YS1930	Back Plate Gasket (available in set, YSO2020)	1
53	YS1940	Back Plate Screws	4	$4.25
54	YS4305	Carburetor Body	1	$56.25
55	YS4310	Throttle Barrel	1	$32.95
56	YS2050	Low Speed Needle Valve	1	$8.50
57	YS2060	Low Speed Needle Valve O-Ring (available in set, YSO2090)	1
58	YS4315	Throttle Barrel Seal	1	$4.95
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	YS2690	Needle Valve	1	$12.95
64	YS2695	Needle Valve O-Ring	1	$3.50
65	YS2700	Needle Seat	1	$9.95
66	YS0775	Needle Seat O-Ring	1	$3.10
67	YS2710	Needle Valve Detent	1	$4.95
68	YS1970	Carburetor Gasket (available in set, YSO2020)	1
69	YS2080	Carburetor Screws	2	$2.95
70	YS1990	Regulator Body	1	$34.50
71	YS0195	Regulator Adjusting Screw	1	$3.25
72	YS0725	Regulator Adjusting Screw O-Ring (available in set, YSO2090)	1
73	YS2000	Diaphragm	1	$2.95
74	YS0176	Plunger (Note: On some later engines this was part #4400, but the factory has changed it back to #0176)	1	$3.10
75	YS0180	Plunger Spring	1	$1.50
76	YS0750	Regulator Screw	2	$1.50
77	YS0710	Fuel Nipples	4	$9.25
78	YS4340	Muffler	1	$36.25
79	YS4345	Exhaust Pipe	1	$16.95
80	YS4350	Lock Nuts	4	$8.25
	YS2020	YS-91 Gasket Set	1	$12.95
	YS2090	YS-91 O-Ring Set	1	$12.95
	YS2100	YS91AC Back Plate Assembly	1	$65.95
	YS02740	Needle Valve Assembly	4	$28.95
	YS0405	Check Valve	1	$7.75

Technical Questions? Call 1-406-259-9004 (M-F 10-8 Sat. 10-6 MST)
To Order or for Pricing Call: 1-800-723-5937