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
Price: 1.08 Inc. VAT. (0.90 Exc. VAT at 20%)

250/370 CYLINDER STUD

250/370 CYLINDER STUD


27781
In stock
Price: 5.70 Inc. VAT. (4.75 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: 2.34 Inc. VAT. (1.95 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
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: 28.80 Inc. VAT. (24.00 Exc. VAT at 20%)

PISTON ASSY STD Y4, 250

PISTON ASSY STD Y4, 250


40907
In stock
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: 123.32 Inc. VAT. (102.77 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%)

BIG END BEARING

BIG END BEARING


29503
In stock
Exploded View No. 22
Price: 19.39 Inc. VAT. (16.16 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%)

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%)

CON ROD KIT 250/370

CON ROD KIT 250/370


0710177
In stock
Exploded View No. 19
Price: 267.40 Inc. VAT. (222.83 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%)

STUD, CRANKCASE TO G/BOX

STUD, CRANKCASE TO G/BOX


28330
In stock
Exploded View No. 29
Price: 3.30 Inc. VAT. (2.75 Exc. VAT at 20%)

WASHER, CRANK CASE STUD

WASHER, CRANK CASE STUD


25592
In stock
Exploded View No. 30
Price: 0.26 Inc. VAT. (0.22 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

BOLT, CRANKCASE


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: 0.66 Inc. VAT. (0.55 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%)

WASHER, CRANKCASE DRAIN PLG

WASHER, CRANKCASE DRAIN PLG


V476
In stock
Exploded View No. 38
Price: 0.30 Inc. VAT. (0.25 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%)

STUD,  CRANK CASE

STUD, CRANK CASE


25573
In stock
Exploded View No. 40
Price: 3.30 Inc. VAT. (2.75 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%)

ENGINE BOLT,NUT + WASHER SET

ENGINE BOLT,NUT + WASHER SET


EBS
In stock
Exploded View No. 40,41,42
Price: 7.20 Inc. VAT. (6.00 Exc. VAT at 20%)