Briggs & Stratton Manufacturing Date Listing

Model Series Q thru ZZ

Briggs & Stratton data used by permission and belong to their respective owner.
Courtesy of The Early Day Gas Engine and Tractor Association.

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This page contains information for engine Models Q thru ZZ. If your engine Model lies in this range, move down the page until you see your model series. The serial number shown under the Month and Year is the last serial number built in that month. If your engine Model is A thru FJ-2 go to page 1 of this listing. If your engine Model is H thru PC go to page 2 of this listing. If your engine Model is 5 thru 23 go to page 4 of this listing.

Engines are listed in alphabetical order

MODEL SERIES Q
MODEL SERIES R, RA, R2, & RC
MODEL SERIES R1, & RH
MODEL SERIES S
MODEL SERIES T
MODEL SERIES U
MODEL SERIES W & WA
MODEL SERIES WMG
MODEL SERIES WI, WR, & WMB
MODEL SERIES WM, & WMI
MODEL SERIES Y
MODEL SERIES Z & ZZ

MODEL SERIES Q L-HEAD, 2.75" BORE, 3.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1925											110	120
1926	124	146	186	210	222	247	254	280	292	407	421	483
1927	509	519	599	689	989	1130	1224	1355	1424	1534	1605	1687
1928	2019	2394	2645	2961	3272	3494	3787	3976	4117	4209	4339	4689
1929	4961	5226	5508	5986	6326	6655	6935	7021	7174	7399	7532	7625
1930	7773	7867	8201	8399	8523	8615	8665	8712	8779	8808	8821	8848
1931			8868	8924	8943	8961	8973	8990	8998	9010	9013
1932		9016	9019	9020	9023	9026				9027
1933		9028		9030	9038			9039			9042

MODEL SERIES R, RA, R2, & RC L-HEAD, 2.75" BORE, 3.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1929				100			102	104	114	160	200	239
1930	514	767	955	1059	1351	1462	1579	1653	1823	1899	2240	2419
1931	2699	2999	3233	3374	3679	3940	4011	4173	4193	4312	4345	4407
1932	4629	4716	5031	5149	5220	5412	5468	5530	5584	5656	5702	5714
1933	5742	5754	5797	5812	5823	5627	5834	5840	5841	5842

MODEL SERIES R1, & RH L-HEAD, 2.75" BORE, 3.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1929	101
1930			103	104			106	110				112
1931	125	127	139	180	182					199
1932	200	201	203	209	216	220

MODEL SERIES S [ALL VERSIONS] L-HEAD, 2.25" BORE, 2.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1930						100	109	183	379	566		767
1931	924	943	1041	1202	1361	1440	1558	1623		1771	1830	1875
1932		1892	1935	1947	1952	2001	2074	2104	2147	2159	2169	2182
1933	2190	2194	2204	2221	2222			2224			2225

MODEL SERIES T [ALL VERSIONS] L-HEAD, 2.25" BORE, 2.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1930								106	108	110	116	152
1931	851			1237	1311

MODEL SERIES U [ALL VERSIONS] L-HEAD, 2.00" BORE, 2.00" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1940									105		111	115
1941	368	1208	3135	3552	4203	5080	5270	5437	5844	5962	7100	11386
1942	12863	12920	12975	13301	13520	13827	13829	13830	13863	13943	13953	13963
1943	13979	14024	14028	14671		14872					15071	15371
1944		16572		16872	17372	17973	18264	18664	22249	22433	23522	25532
1945	25882		26121		26359	27672					29672	30991

MODEL SERIES W & WA L-HEAD, 2.75" BORE, 3.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1931						108	109	110	368	750	1119	1128
1932	1131	1138	1145	1156	1157	1158	1218	1221	1231	1236	1238	1239
1933	1242		1245	1247	1252

MODEL SERIES WMG L-HEAD, 2.00" BORE, 1.50" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1937						1190	2987	3968	5269	5654	6186	6824
1938	7284	7508	8195	8447	8468	8553	8727	8809	8843	8861	8930	8962
1939	9028	9083	9085		9123	9126	9138
1940	9198	9206	9207		9208	9216	9221		9224	9234
1941	9238	9242

MODEL SERIES WI, WR, & WMB L-HEAD, 2.00" BORE, 1.50" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1938										6178	8911	11858
1939	17085	24912	36322	43403	49477	56016	61978	69193	74577	75485	86659	96859
1940	102241	110866	123474	131834	140045	143721	147580	153157	159297	165240	171683	179017
1941	190287	201016	213184	225278	237788	252442	261020	272106	280498	293122	304649	316332
1942	327862	338205	348318	349249	350981	351469	351690	352154	352164	352545	352560	353089
1943	353230	353240	353262	354646	354983	355416				355624	355938	355939
1944				355942		355947	355962	355963	357299	358048		358152
1945	360133	360619	363284	366256	369635	371255	372150	373330	374264	380265	387123	393569
1946	405680	423588	433126	433776	454592	466486	482022	488599	505095	511255	538679
1947	564403	577613	591177	617639	624217	638739	651466	666943	684882	703879	720237	731859
1948	752844	773944	795949	831713	839716	855496	875336	891642	921732	945572	968182	990614
1949	1029803	1058258	1088445	1118300	1140097	1159006	1165312	1167925	1172593	1172610	1173871	1174570
1950	1174874	1176817	1177144	1178229	1179774	1178774	1181192	1183892	1183994		1185420	1186429
1951	1186563	1187433	1187434	1190820	1190852	1191482			1191632	1192813	1193249	1193663
1952	1194224	1195154		1196127	1196761	1197134	1197901		1198315	1199127	1199834	1200650
1953	1201527	1202349	1203350	1204668	1205561	1207031	1208064	1208690	1210222	1210815	1212526	1212796
1954	1214264		1214839	1215335	1215829		1216860	1217286	1217914	1218066	1218938	1219315
1955	1220357	1220579	1221143	1221571	1222446	1222933	1223606	1224922	1225547	1226674	1227223	1228154
1956	1229630	1229631	1230287	1231053	1231653	1232793	1233390	1233932	1234732	1236343	1237988	1240316
1957	1240446

MODEL SERIES WM, & WMI L-HEAD, 2.00" BORE, 1.50" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1936								250	3375	9365	16500	24196
1937	36315	36853	49764	71627	87748	106549	113081	117497	125458	130504	131023	134170
1938	138129	143965	151808	159320	169349	175561	179337	189123	195742	196211	196535	196554
1939	196631	196676	196693	196711	196727	196740				196761	196935	196938
1940						196944		196955	196965	196966	196971	197021
1941	197081	197103	197135		197145	197190	197255				197246

MODEL SERIES Y [ALL VERSIONS] L-HEAD, 2.25" BORE, 2.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1931								101	102	103	294	933
1932	1671	2542	3150	3530	5579	6179	6853	7900	8970	9550	11230	11515
1933	12393	14112	16299	17780	20618	23377	27089	31985	39573	45163	47454	48886
1934	51483	55062	60816	66792	73813	81108	82987	85438	91335	96539	100634	104260
1935	111016	120400	130914	148843	158185	167003	177664	189162	200355	212350	216270	222867
1936	234728	246310	252916	263458	271810	280319	293466	310866	321104	326473	329466	330889
1937	330542	330776	332303	332716	333245	333758	333965	334869	335270	335295	335748	336084
1938	336621	336629		337672	338184	338195	338211		338232	338241
1939	338245	338255							338288
1940					338332

MODEL SERIES Z & ZZ [ALL VERSIONS] L-HEAD, 3.00" BORE, 3.25" STROKE

YEAR	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP	OCT	NOV	DEC
1931								101	102	109	114	122
1932	126	154	167	245	277	303	348	356	388	407	424	432
1933	446	466	530	544	668	699	724	805	908	1000	1053	1128
1934	1196	1221	1449	1580	1775	1861	1958	2032	2122	2177	2216	2254
1935	2372	2426	2560	2826	3087	3358	3446	3526	3585	3671	3713	4085
1936	4332	4603	4863	5333	5896	6233	6436	6564	6686	6795	6870	7196
1937	7538	7987	8603	9427	10159	10920	11266	11560	11670	11809	11892	11956
1938	12136	12266	12546	12918	13224	13440	13557	13667	13743	14284	14384	14527
1939	14631	14765	15283	15678	15979	16223	16469	16739	16932	17057	17271	17602
1940	18210	18697	19234	19967	20670	21023	21336	21794	22063	22334	22715	23156
1941	23999	25037	26286	27453	28770	29855	31058	32488	33777	33813	35218	35720
1942	36445	37416	39350	43743	46548	52853	59614	67563	74168	78039	81827	86844
1943	90639	95276	100842	107585	113307	118769	123931	130896	137348	142337
1944	155595	161174	167645	174170	180125	186548	192014	196158	201264	206225	211815	217852
1945	221621	227409	231869	236408	241782	246962	249924	253900	259989	262829	264544	265819
1946	267567	269011	270766	271909	273940	275783	277302	278373	280115	282403	284884
1947	288426	290407	292882	297652	300742	304450	307513	310785	314335	319793	321932	326809
1948	330682	333044	336646	341034	344435	345927	347870	351598	355426	357560	359412	361074
1949	361083			361093					361098	361103

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Last modified:  08 / 03 / 2005