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AJS Motorcycles Ltd.
AJS Motorcycles Ltd.

A1 - Y4 250cc engine

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The Y4 was the first version of the 250 Stormers. They were produced from 1969 up to 1970.
The engines were a development of the Villiers Starmaker 250.
If you can't see the part you are looking for in this section you can look in the later Y4 mk 2 section. Parts are interchangeable.

NUT, CYLNDR HEAD

NUT, CYLNDR HEAD


27782
In stock
Exploded View No. 1
Price: £9.90 Inc. VAT. (£8.25 Exc. VAT at 20%)

WASHER, CYLNDR HEAD. (LARGE)

WASHER, CYLNDR HEAD. (LARGE)


27861
In stock
Exploded View No. 2
Price: £4.50 Inc. VAT. (£3.75 Exc. VAT at 20%)

250/370 CYLINDER STUD

250/370 CYLINDER STUD


27781
In stock
Exploded View No. 4
Price: £5.70 Inc. VAT. (£4.75 Exc. VAT at 20%)

CYLINDER (BARE) Y4 250 Mk1

CYLINDER (BARE) Y4 250 Mk1


40908
In stock
Exploded View No. 5
Price: £118.80 Inc. VAT. (£99.00 Exc. VAT at 20%)

LINER 250 BLANK NOT BORED

LINER 250 BLANK NOT BORED


60525
In stock
Exploded View No. 5a
Price: £66.00 Inc. VAT. (£55.00 Exc. VAT at 20%)

SLEEVE EXHST PIPE Y4 (BRONZE)

SLEEVE EXHST PIPE Y4 (BRONZE)


31155
In stock
Exploded View No. 6
Price: £47.88 Inc. VAT. (£39.90 Exc. VAT at 20%)

STARMAKER & Y4Mk1, BASE GASKET (0.010

STARMAKER & Y4Mk1, BASE GASKET (0.010" thick)


25088
In stock
Exploded View No. 7
Price: £3.00 Inc. VAT. (£2.50 Exc. VAT at 20%)

5/16 UNF STUD

5/16 UNF STUD


0700185
In stock
Exploded View No. 8+15
Price: £2.46 Inc. VAT. (£2.05 Exc. VAT at 20%)

INLET MANIFOLD GASKET

INLET MANIFOLD GASKET


30654
In stock
Exploded View No. 11
Price: £4.50 Inc. VAT. (£3.75 Exc. VAT at 20%)

SCREW, INLET MNIFLD

SCREW, INLET MNIFLD


31219
In stock
Exploded View No. 12
Price: £0.96 Inc. VAT. (£0.80 Exc. VAT at 20%)

MANIFOLD, INLET Mk1 AMAL, Y4 250

MANIFOLD, INLET Mk1 AMAL, Y4 250


60594
In stock
Exploded View No. 13
Price: £41.40 Inc. VAT. (£34.50 Exc. VAT at 20%)

MANIFOLD INLET Mk2 AMAL, (ALL)

MANIFOLD INLET Mk2 AMAL, (ALL)


60594FB
In stock
Exploded View No. 13
Price: £31.80 Inc. VAT. (£26.50 Exc. VAT at 20%)

PISTON RING SET STD Y4

PISTON RING SET STD Y4


40976
In stock
Exploded View No. 14
Price: £28.80 Inc. VAT. (£24.00 Exc. VAT at 20%)

PISTON RING SET +010 Y4

PISTON RING SET +010 Y4


31054
In stock
Exploded View No. 14a
Price: £28.80 Inc. VAT. (£24.00 Exc. VAT at 20%)

PISTON RING SET +020 Y4

PISTON RING SET +020 Y4


31055
In stock
Exploded View No. 14a
Price: £28.80 Inc. VAT. (£24.00 Exc. VAT at 20%)

PISTON RING SET +030 Y4

PISTON RING SET +030 Y4


31056
In stock
Exploded View No. 14a
Price: £28.80 Inc. VAT. (£24.00 Exc. VAT at 20%)

PISTON RING SET +040 Y4

PISTON RING SET +040 Y4


0710039
In stock
Exploded View No. 14a
Price: £30.24 Inc. VAT. (£25.20 Exc. VAT at 20%)

PISTON ASSY STD Y4, 250

PISTON ASSY STD Y4, 250


40907
In stock
Exploded View No. 15
Price: £96.00 Inc. VAT. (£80.00 Exc. VAT at 20%)

PISTON ASSY +010 Y4, 250

PISTON ASSY +010 Y4, 250


30910
In stock
Exploded View No. 15A
Price: £96.00 Inc. VAT. (£80.00 Exc. VAT at 20%)

PISTON ASSY +020 Y4, 250

PISTON ASSY +020 Y4, 250


30911
In stock
Exploded View No. 15A
Price: £96.00 Inc. VAT. (£80.00 Exc. VAT at 20%)

PISTON ASSY +030 Y4, 250

PISTON ASSY +030 Y4, 250


30912
In stock
Exploded View No. 15A
Price: £96.00 Inc. VAT. (£80.00 Exc. VAT at 20%)

PISTON 250 +040

PISTON 250 +040


0710035
In stock
Exploded View No. 15A
Price: £129.49 Inc. VAT. (£107.91 Exc. VAT at 20%)

CIRCLIP, PISTON

CIRCLIP, PISTON


27866
In stock
Exploded View No. 16
Price: £0.72 Inc. VAT. (£0.60 Exc. VAT at 20%)

PIN GUDGEON Y4

PIN GUDGEON Y4


27867
In stock
Exploded View No. 17
Price: £19.20 Inc. VAT. (£16.00 Exc. VAT at 20%)

CON ROD KIT 250/370

CON ROD KIT 250/370


0710177
In stock
Exploded View No. 19
Price: £322.56 Inc. VAT. (£268.80 Exc. VAT at 20%)

SMALL END BUSH

SMALL END BUSH


25091
In stock
Exploded View No. 19a
Price: £10.03 Inc. VAT. (£8.36 Exc. VAT at 20%)

PLUG, CRANK PIN

PLUG, CRANK PIN


26682
In stock
Exploded View No. 21
Price: £2.54 Inc. VAT. (£2.12 Exc. VAT at 20%)

BIG END BEARING

BIG END BEARING


29503
In stock
Exploded View No. 22
Price: £22.10 Inc. VAT. (£18.42 Exc. VAT at 20%)

THRUST WASHER, BIG END

THRUST WASHER, BIG END


29991
In stock
Exploded View No. 25
Price: £4.78 Inc. VAT. (£3.98 Exc. VAT at 20%)

CRANK SEAL (left or right)

CRANK SEAL (left or right)


31156
In stock
Exploded View No. 26
Price: £6.62 Inc. VAT. (£5.52 Exc. VAT at 20%)

L/H CRANKSHAFT NEEDLE BEARING

L/H CRANKSHAFT NEEDLE BEARING


27824
In stock
Exploded View No. 27
Price: £13.50 Inc. VAT. (£11.25 Exc. VAT at 20%)

STUD, CRANK CASE TO CRANK CASE

STUD, CRANK CASE TO CRANK CASE


25573
In stock
Exploded View No. 29
Price: £4.50 Inc. VAT. (£3.75 Exc. VAT at 20%)

WASHER, CRANK CASE STUD

WASHER, CRANK CASE STUD


25592
In stock
Exploded View No. 30
Price: £0.60 Inc. VAT. (£0.50 Exc. VAT at 20%)

NUT, CRANKCASE STUD

NUT, CRANKCASE STUD


EM1565
In stock
Exploded View No. 31
Price: £1.14 Inc. VAT. (£0.95 Exc. VAT at 20%)

BOLT, CRANKCASE TO CRANK CASE

BOLT, CRANKCASE TO CRANK CASE


27814
In stock
Exploded View No. 32
Price: £2.46 Inc. VAT. (£2.05 Exc. VAT at 20%)

DOWEL G/BOX

DOWEL G/BOX


E7619
In stock
Exploded View No. 33
Price: £1.02 Inc. VAT. (£0.85 Exc. VAT at 20%)

BOLT CRNKCASE TO G/BOX

BOLT CRNKCASE TO G/BOX


27839
In stock
Exploded View No. 34
Price: £2.54 Inc. VAT. (£2.12 Exc. VAT at 20%)

STUD, CRANKCASE TO G/BOX

STUD, CRANKCASE TO G/BOX


28330
In stock
Exploded View No. 35
Price: £3.30 Inc. VAT. (£2.75 Exc. VAT at 20%)

5/16 SPRNG WASHER

5/16 SPRNG WASHER


22528
In stock
Exploded View No. 36
Price: £0.60 Inc. VAT. (£0.50 Exc. VAT at 20%)

5/16 UNF PLAIN NUT

5/16 UNF PLAIN NUT


27815
In stock
Exploded View No. 37
Price: £0.72 Inc. VAT. (£0.60 Exc. VAT at 20%)

WASHER, CRANKCASE DRAIN PLG

WASHER, CRANKCASE DRAIN PLG


V476
In stock
Exploded View No. 38
Price: £0.60 Inc. VAT. (£0.50 Exc. VAT at 20%)

DRAIN PLUG, CRANK CASE

DRAIN PLUG, CRANK CASE


25602
In stock
Exploded View No. 39
Price: £0.78 Inc. VAT. (£0.65 Exc. VAT at 20%)

ENGINE BOLT,NUT + WASHER SET

ENGINE BOLT,NUT + WASHER SET


EBS
In stock
Exploded View No. 40
Price: £7.20 Inc. VAT. (£6.00 Exc. VAT at 20%)

WASHER, SPRNG 3/8

WASHER, SPRNG 3/8


0700041
In stock
Exploded View No. 41
Price: £0.60 Inc. VAT. (£0.50 Exc. VAT at 20%)

CRANK SHIM, MAG BACKPLTE (0.004

CRANK SHIM, MAG BACKPLTE (0.004")


27844
In stock
Exploded View No. 43
Price: £1.37 Inc. VAT. (£1.14 Exc. VAT at 20%)

MAIN BEARING

MAIN BEARING


27832
In stock
Exploded View No. 44
Price: £42.16 Inc. VAT. (£35.13 Exc. VAT at 20%)

5/16 PLAIN WASHER

5/16 PLAIN WASHER


0700107
In stock
Exploded View No. 46
Price: £0.60 Inc. VAT. (£0.50 Exc. VAT at 20%)

5/16 UNC PLAIN NUT

5/16 UNC PLAIN NUT


0700198
In stock
Exploded View No. 47
Price: £0.70 Inc. VAT. (£0.58 Exc. VAT at 20%)

SOCKET SCREW 1/4 UNC 3/4 LNG

SOCKET SCREW 1/4 UNC 3/4 LNG


27837
In stock
Exploded View No. 48
Price: £0.72 Inc. VAT. (£0.60 Exc. VAT at 20%)