Internal engine - 998 and 1098cc

Pistons, Piston Rings and Cylinder Liners
Note before ordering a piston set or ring set from Somerford Mini: a set of pistons consists of four pistons complete with rings and gudgeon pins; a set of rings consists of sufficient rings for four pistons. Cylinder liners are supplied individually. Various piston upgrades (superior design and manufacture, different capacities and compression ratios) are also available from Somerford Mini, but are only listed in this catalogue in instances where they make a good, complication-free replacement for original specification pistons which are in short supply.

998cc 1963-80 (not Cooper)
4 Ring Piston With 0.125" Thick Double Bevelled Oil Ring
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
1	12A673STD	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, standard size.
	12A673020	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.020" oversize.
	12A673030	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.030" oversize.
	12A673040	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.040" oversize.
	12A673060	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.060" oversize.
2	BHM1162STD	RING SET, 4 piston set	1	Standard size.
	BHM1162020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1162030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1162040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1162060	RING SET, 4 piston set	1	+0.060" oversize.

998cc 1980-84 (A Plus)
4 Ring Piston With 0.158" Thick Special Oil Ring
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
3	ADU3920STD	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, standard size.
	ADU3920020	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.020" oversize.
	ADU3920030	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.030" oversize.
	ADU3920040	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.040" oversize.
	ADU3920060	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.060" oversize.
	ADU3922STD	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, standard size.
	ADU3922020	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.020" oversize.
	ADU3922030	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.030" oversize.
	ADU3922040	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.040" oversize.
	ADU3922060	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.060" oversize.
4	BHM1281STD	RING SET, 4 piston set	1	Standard size.
	BHM1281020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1281030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1281040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1281060	RING SET, 4 piston set	1	+0.060" oversize.

998cc 1984-88 (A Plus)
3 Ring Piston With Gudgeon Pin Retained By Circlips
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
5	ADU3490STD	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, standard size.
	ADU3490020	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.020" oversize.
	ADU3490030	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.030" oversize.
	ADU3490040	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.040" oversize.
	ADU3490060	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.060" oversize.
	ADU4203STD	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, standard size.
	ADU4203020	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.020" oversize.
	ADU4203030	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.030" oversize.
	ADU4203040	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.040" oversize.
	ADU4203060	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.060" oversize.
6	BHM1415STD	RING SET, 4 piston set	1	Standard size.
	BHM1415020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1415030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1415040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1415060	RING SET, 4 piston set	1	+0.060" oversize.

998cc 1988 On (A Plus)
3 Ring Piston With Press Fit Gudgeon Pin
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
7	TAM2052STD	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, standard size.
	TAM2052020	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.020" oversize.
	TAM2052030	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.030" oversize.
	TAM2052040	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.040" oversize.
	TAM2052060	PISTON SET, set of 4, flat piston crown	1	10.3:1 compression ratio, +0.060" oversize.
	TAM2054STD	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, standard size.
	TAM2054020	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.020" oversize.
	TAM2054030	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.030" oversize.
	TAM2054040	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.040" oversize.
	TAM2054060	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.060" oversize.
8	BHM1629STD	RING SET, 4 piston set	1	Standard size.
	BHM1629020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1629030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1629040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1629060	RING SET, 4 piston set	1	+0.060" oversize.

998cc 1963-69 (Cooper)
4 Ring Piston
Note that the 9:1 compression ratio Cooper pistons have been out of production for many years and supply of this type is therefore almost non-existant. The Powermax pistons listed further down the page are most often supplied as replacements.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
9	12A674STD	PISTON SET, set of 4, raised 'D' piston crown	1	9:1 compression ratio, standard size.
	12A674020	PISTON SET, set of 4, raised 'D' piston crown	1	9:1 compression ratio, +0.020" oversize.
	12A674030	PISTON SET, set of 4, raised 'D' piston crown	1	9:1 compression ratio, +0.030" oversize.
	12A674040	PISTON SET, set of 4, raised 'D' piston crown	1	9:1 compression ratio, +0.040" oversize.
	12A674060	PISTON SET, set of 4, raised 'D' piston crown	1	9:1 compression ratio, +0.060" oversize.
	12A593STD	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, standard size.
	12A593020	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.020" oversize.
	12A593030	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.030" oversize.
	12A593040	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.040" oversize.
	12A593060	PISTON SET, set of 4, dished piston crown	1	8.3:1 compression ratio, +0.060" oversize.
10	BHM1162STD	RING SET, 4 piston set	1	Standard size.
	BHM1162020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1162030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1162040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1162060	RING SET, 4 piston set	1	+0.060" oversize.

998cc 1963-69 (Cooper)
3 Ring Powermax Piston
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
11	20950STD	PISTON SET, set of 4, flat piston crown	1	9.7:1 compression ratio, standard size.
	20950020	PISTON SET, set of 4, flat piston crown	1	9.7:1 compression ratio, +0.020" oversize.
	20950040	PISTON SET, set of 4, flat piston crown	1	9.7:1 compression ratio, +0.040" oversize.
	20950060	PISTON SET, set of 4, flat piston crown	1	9.7:1 compression ratio, +0.060" oversize.
12	R39400STD	RING SET, 4 piston set	1	Standard size.
	R39400020	RING SET, 4 piston set	1	+0.020" oversize.
	R39400040	RING SET, 4 piston set	1	+0.040" oversize.
	R39400060	RING SET, 4 piston set	1	+0.060" oversize.

1098cc 1975-80
4 Ring Piston With 0.125" Thick Double Bevelled Oil Ring
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
13	12G758STD	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, standard size.
	12G758020	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.020" oversize.
	12G758030	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.030" oversize.
	12G758040	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.040" oversize.
	12G758060	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.060" oversize.
14	BHM1162STD	RING SET, 4 piston set	1	Standard size.
	BHM1162020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1162030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1162040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1162060	RING SET, 4 piston set	1	+0.060" oversize.

1098cc 1980-81 (A Plus)
4 Ring Piston With 0.158" Thick Special Oil Ring
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
15	BAU4418STD	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, standard size.
	BAU4418020	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.020" oversize.
	BAU4418030	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.030" oversize.
	BAU4418040	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.040" oversize.
	BAU4418060	PISTON SET, set of 4, dished piston crown	1	8.5:1 compression ratio, +0.060" oversize.
16	BHM1465STD	RING SET, 4 piston set	1	Standard size.
	BHM1465020	RING SET, 4 piston set	1	+0.020" oversize.
	BHM1465030	RING SET, 4 piston set	1	+0.030" oversize.
	BHM1465040	RING SET, 4 piston set	1	+0.040" oversize.
	BHM1465060	RING SET, 4 piston set	1	+0.060" oversize.
17	CCN210	CIRCLIP, gudgeon pin	8	Not 998cc 1988 on.
18	12G164	LINER, cylinder	4	Standard size.

Connecting Rods and Crankshaft
Connecting Rods 1963-88
(Gudgeon Pin Retained By Circlips)
In 1981 the connecting rod big end cap screw was changed to an improved stretch bolt design which no longer required a lock tab to ensure it was secured in place. New connecting rod assemblies are most likely to include stretch bolts, although 'new old stock' rods with bolts and lock tabs that have been gathering dust in a corner of a store for many years may still surface from time to time. When reassembling an engine, make sure all big end caps are secured by the same bolt design.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
19	12G123	ROD ASS'Y, connecting, nos 2 and 4	2
20	12G126	ROD ASS'Y, connecting, nos 1 and 3	2
21	12G125	BUSH, small end	4	Included in rod assembly.
22	12G2217	BOLT, connecting rod cap ('big end')	8	1963-81; see note above.
23	2A660	LOCK TAB, bolt	4	1963-81; see note above.
24	CAM6126	BOLT, connecting rod cap ('big end')	8	1981-88; see note above.

Connecting Rods 1988 On
(Press Fit Gudgeon Pin)
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
25	12A1997	ROD ASS'Y, connecting, nos 2 and 4	2
26	12A1999	ROD ASS'Y, connecting, nos 1 and 3	2
27	12G125	BUSH, small end	4	Included in rod assembly.
28	CAM6126	BOLT, connecting rod cap ('big end')	8
29	8G2198STD	BEARING SET, connecting rod ('big end bearings')	1	Set of 4 pairs, standard size.
	8G2198010	BEARING SET, connecting rod ('big end bearings')	1	Set of 4 pairs, 0.010" undersize.
	8G2198020	BEARING SET, connecting rod ('big end bearings')	1	Set of 4 pairs, 0.020" undersize.
	8G2198030	BEARING SET, connecting rod ('big end bearings')	1	Set of 4 pairs, 0.030" undersize.
	8G2198040	BEARING SET, connecting rod ('big end bearings')	1	Set of 4 pairs, 0.040" undersize.

Crankshaft
Crankshafts shown here are either assemblies (including main bearings, connecting rod bearings and thrust washers), or bare (without bearings or thrust washers). However, please note that new crankshafts may be supplied complete with bearings but other times not, depending on what is available at the time. Additionally Somerford Mini can offer a crankshaft regrinding service, usually carried out on your old unit. You should enquire on the current status of supply before ordering a crankshaft from Somerford Mini.

For details of the primary gear and its bushes located on the tail of the crankshaft, please see the 'Manual Gearbox - Primary, Idler and Drive Gears' section or the 'Automatic Transmission - Torque Converter and Housing' section in the Transmissions area of the Somerford Mini catalogue.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
30	8G2733	CRANKSHAFT ASS'Y (with 1963-83 main bearings)	1	998cc 1963-83. Stamped no. 12A595 or 12A1451.
	BHM1436	CRANKSHAFT ASS'Y (with 1983 on main bearings)	1	998cc 1983 on. Stamped no. 12A1451.
	8G2732	CRANKSHAFT ASS'Y (with 1963-83 main bearings)	1	1098cc. Stamped no. 12G82.
31	12A1451	CRANKSHAFT, bare	1	998cc. Stamped 12A1451.
	12G82	CRANKSHAFT, bare	1	1098cc. Stamped no. 12G82.

There are two distinct main bearing designs: 8G2332 bearings have locating lugs on the edge of both upper and lower halves, whereas BHM1573 bearings have lugs on the edge of the upper halves and in the centre of the lower halves. They cannot be interchanged in engines because the engine main bearing caps are unique for each design.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
32	8G2332STD	BEARING SET, main bearings, set of 3 pairs	1	998cc 1963-83 and 1098cc; std. size.
	8G2332010	BEARING SET, main bearings, set of 3 pairs	1	998cc 1963-83 and 1098cc; 0.010" undersize.
	8G2332020	BEARING SET, main bearings, set of 3 pairs	1	998cc 1963-83 and 1098cc; 0.020" undersize.
	8G2332030	BEARING SET, main bearings, set of 3 pairs	1	998cc 1963-83 and 1098cc; 0.030" undersize.
	8G2332040	BEARING SET, main bearings, set of 3 pairs	1	998cc 1963-83 and 1098cc; 0.040" undersize.
	BHM1573STD	BEARING SET, main bearings, set of 3 pairs	1	998cc 1983 on; std. size.
	BHM1573010	BEARING SET, main bearings, set of 3 pairs	1	998cc 1983 on; 0.010" undersize.
	BHM1573020	BEARING SET, main bearings, set of 3 pairs	1	998cc 1983 on; 0.020" undersize.
	BHM1573030	BEARING SET, main bearings, set of 3 pairs	1	998cc 1983 on; 0.030" undersize.
	BHM1573040	BEARING SET, main bearings, set of 3 pairs	1	998cc 1983 on; 0.040" undersize.

Thrust washers are supplied as a pair; i.e. one upper and one lower thrust washer. Two pairs are required per engine, fitted selectively to obtain the correct amount of end float on the crankshaft.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
33	BHM1292STD	THRUST WASHERS, crankshaft, pair	A/R	Standard size.
	BHM1292003	THRUST WASHERS, crankshaft, pair	A/R	+0.003" oversize.
	BHM1292030	THRUST WASHERS, crankshaft, pair	A/R	+0.030" oversize.
34	6K836	KEY, Woodruff, crankshaft	1
35	8G725	GEAR, timing chain, crankshaft	1	998cc (not Cooper) and 1098cc.
	AEA538	GEAR, timing chain, crankshaft	1	998cc (Cooper).
36	6K628	WASHER, packing	A/R
37	12A1148	OIL THROWER, crankshaft	1
38	88G561	OIL SEAL, timing cover	1	Included in timing cover assembly.

Crankshaft Pulley
The 998cc (not Cooper) engine was not fitted with a vibration damper type pulley, whereas the 1098cc engine used a one-piece damper pulley. The 998cc Cooper unit also received one, or in fact two different ones. The original design was a separate pulley with a with a damper screwed to it; eventually a one-piece damper pulley was offered as a replacement but in fact both set ups remained available as spares for many years. If you want the original pulley, it is still available today from Somerford Mini.

Note that the bolt retaining the pulley to the crankshaft is specific to the type of pulley being fitted. Later 998cc and 1098cc engines from 1980 approximately onwards received pulleys with strobe timing plates attached as part of the A Plus modification programme.

998cc (not Cooper) Crankshaft Pulley
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
39	2A940	PULLEY, crankshaft	1	1963-70, dynamo fitted models.
	12A1380	PULLEY, crankshaft	1	1963-70, alternator fitted models.
	CAM6323	PULLEY, crankshaft	1	1970-80; may be used on earlier engines.
	CAM6497	PULLEY, crankshaft	1	1980 on; A Plus type with timing plate.
40	AEA312	BOLT, pulley to crankshaft	1	1963-87.
	TAM2019	BOLT, pulley to crankshaft	1	1987 on.
41	12A398	LOCK TAB, pulley bolt	1	1963-87.
	TAM2020	LOCK TAB, pulley bolt	1	1987 on.

998cc (Cooper) Crankshaft Pulley
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
42	AEG454	PULLEY, crankshaft	1	Separate pulley and damper fitment.
43	12A367	DAMPER	1	Separate pulley and damper fitment.
44	SH605051	SCREW, damper to pulley	4	Separate pulley and damper fitment.
45	LWZ305	WASHER, locking	4	Separate pulley and damper fitment.
46	AEA312	BOLT, pulley to crankshaft	1	Separate pulley and damper fitment.
47	12A398	LOCK TAB, pulley bolt	1	Separate pulley and damper fitment.
48	88G305	PULLEY, crankshaft, with damper	1	One-piece damper pulley fitment.
49	12A283	BOLT, pulley to crankshaft	1	One-piece damper pulley fitment.
50	12A398	LOCK TAB, pulley bolt	1	One-piece damper pulley fitment.

1098cc Crankshaft Pulley
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
51	88G305	PULLEY, crankshaft, with damper	1	1975-76.
	CAM4929	PULLEY, crankshaft, with damper	1	1976-80; can be used to replace 88G305.
	AHU1878	PULLEY, crankshaft, with damper	1	1980 on; A Plus type with timing plate.
52	12A283	BOLT, pulley to crankshaft	1
53	12A398	LOCK TAB, pulley bolt	1

Camshaft and Tappets
A range of uprated camshafts and other engine tuning components are also available from Somerford Mini, but are not listed here. Please contact us for details.

998cc (not Cooper) Camshaft
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
54	8G712	CAMSHAFT, for 'pin drive' oil pump	1	1963-80, manual gearbox.
	12A1065	CAMSHAFT, for 'star drive' oil pump	1	1967-80, automatic gearbox.
	CAM6267	CAMSHAFT, for 'slot drive' oil pump	1	1980 on, A Plus type. For 8.3:1 compression ratio.
	CAM4717	CAMSHAFT, for 'slot drive' oil pump	1	1980 on, A Plus type. For 10.3:1 compression ratio.

998cc (Cooper) Camshaft
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	AEA630	CAMSHAFT, for 'pin drive' oil pump	1	Alternative to 12G165.
	12G165	CAMSHAFT, for 'pin drive' oil pump	1	Alternative to AEA630.

1098cc Camshaft
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
	AEA630	CAMSHAFT, for 'pin drive' oil pump	1	1975-80, alternative to 12G165.
	12G165	CAMSHAFT, for 'pin drive' oil pump	1	1975-80, alternative to AEA630.
	12G2983	CAMSHAFT, for 'slot drive' oil pump	1	1980 on, A Plus type.
55	2A299	PIN, oil pump drive	1	Included in 'pin drive' type camshafts.
56	CHM108	FLANGE, for 'star drive' oil pump (flange also known as 'spider')	1	Use with 'star drive' type camshaft.
57	12G4499	SPINDLE, distributor drive, centred slot	1	1963-80.
	12G3560	SPINDLE, distributor drive, offset slot	1	1980 on, A Plus type.
58	2A13	TAPPET (also known as cam follower)	8	Standard size.
	2A13010	TAPPET (also known as cam follower)	8	+0.010" oversize.
59	2A14	PUSH ROD	8	Alternative to 12A250 when replaced in sets.
	12A250	PUSH ROD	8	Alternative to 2A14 when replaced in sets.

Timing Chain
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
60	3H2127	CHAIN, timing	1
61	2A85	GEAR, timing chain, camshaft, with ring tensioners	1	1963-74, may be replaced by 12G4337 without ring tensioners.
62	2A86	GEAR, timing chain, camshaft, ring tensioner type	1	1963-74, may be replaced by 12G4337 without ring tensioners.
63	12G4337	GEAR, timing chain, camshaft	1	1974-79, use without ring tensioners. 1979 on, use with tensioner pad.
64	8G549	RING, timing chain tensioner, rubber	2	1963-74.
65	12G2621	PAD, timing chain tensioner	1	1979 on.
66	12G2629	PIN, tensioner pivot	1	1979 on.
67	12G2628	PLATE, tensioner mounting	1	1979 on.
68	SH605061	SCREW, plate to cylinder block	2	1979 on.
69	LWZ305	WASHER, locking	2	1979 on.
70	PWZ105	WASHER, plain	2	1979 on.
71	WKN505	KEY, Woodruff	1
72	6K629	NUT, gear to camshaft	1
73	2A759	LOCK TAB, nut	1

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Internal engine - 998 and 1098cc

TIMING CHAIN-SIMPLEX-IWIS HEAVY DUTY

KEY-WOODRUFF-TIMING GEAR TO CAMSHAFT

PISTON SET-DISHED-3 RINGS 8.3:1 CR STD. SIZE 998cc '88 ON

PISTON SET-DISHED-3 RINGS 8.3:1 CR +060'' 998cc '88 ON

PISTON SET-DISHED-3 RINGS 8.3:1 CR +040'' 998cc '88 ON

PISTON SET-DISHED-3 RINGS 8.3:1 CR +030'' 998cc '88 ON

PISTON SET-DISHED-3 RINGS 8.3:1 CR +020'' 998cc '88 ON

PISTON SET-FLAT TOP-3 RINGS 10.3:1 CR STD.SIZE 998cc '88 ON

PISTON SET-FLAT TOP-3 RINGS 10.3:1 CR +060'' 998cc '88 ON

PISTON SET-FLAT TOP-3 RINGS 10.3:1 +040'' 998cc '88 ON

PISTON SET-FLAT TOP-3 RINGS 10.3:1 CR +030'' 998cc '88 ON

PISTON SET-FLAT TOP-3 RINGS 10.3:1 CR +020'' 998cc '88 ON

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