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TECHNICAL INFORMATION
Subject Change of Engine and Air Cleaner Parts
Y04088
(page 1 of 3)
For Models EM4250, EM4251, MS250.4, MS251.4
Country All countries
Description See below.
1) Shape of Cylinder Block Set (Part No. 5921005001, Cylinder Block and Crank Housing) has been changed.
1-1) Cylinder Block of the Cylinder Block Set has been changed as follows.
Fins of the new Cylinder Block have become bigger than the current one and a new fin has been added to Cylinder Block.
Holes for check valves have been added.
The underside face of the Cylinder Block fitting to Crank Housing has been changed as a result of adding holes for check
valves..
Current New
Bigger fin than
the current one
Holes for check valves
Fin has been added. have been added.
The underside face of the Cylinder Block fitting to
Crank Housing has been changed as a result of adding
holes for check valves.
1-2) Check Valves have been added to the Cylinder Block as shown below.
Current New
Check Valves
have been added.
1-3) Shape of the underside face of the Crank Housing fitting to the Cylinder Block has been changed as shown below.
2) Balls have been eliminated from the Crank Housing.
3) Socket Head Bolts (0119059500) have been replaced by Socket Head Bolts (0119059510) as shown below.
Current New
The shape of the underside face of the Crank Housing
fitting to the Cylinder Block has been changed
as shown below.
Socket Head Bolt M5x30 Socket Head Bolt M5x14
(Part No. 0119059500) (Part No. 0119059510)
Balls
Balls have been eliminated.
Y04088
(page 2 of 3)
4) The shape of Rocker Cover Complete has been changed as shown below.
Current New
Pipe Pipe
Rocker Cover
Rocker Cover
5) Air Cleaner Plate Complete has been changed as shown below.
6) Shape of Separator Plate has been changed as shown below.
7) Separator Gasket has been added.
8) As a result of the changes 3) through 5) above, the part No. of Air Cleaner Plate has been changed from
5923004002 to 592304003.
8) Air Cleaner Plate
Choke Lever
(5) Air Cleaner
O Ring P15 Plate Complete
Current New
Air Cleaner Element
The shape has been changed
in the circled area in which check
valve (1) is installed.
Check Valve (1)
(7) Separator Gasket (6) Separator Plate
has been added. Current New
O Ring P14
Check Valve Plate
Check Valve
Adhesive was No Adhesive has
applied. been applied.
9) Screw Assembly (M5x10) has been added. Cylinder Block
Insulator Insulator
Gasket
Carburetor
Insulator
10) Carburetor Gasket has been changed as shown below.
Current New
9) Screw Assembly (M5x10)
Y04088
(page 3 of 3)
Interchangeability(I/C)
Item No. Current part Q'ty I/C New part Q'ty Note
Cylinder Block Set No Cylinder Block Set
1 1
5921005001 5921005002
Check Valve Interchangeable
2
5921501800 as a set
Ball
2
5921501200
Socket Head Bolt Socket Head Bolt
2 Yes 2
0119059500 0119059510
Rocker Cover Complete Rocker Cover Complete
1 Yes 1
5921004000 5921004001
Cleaner Plate Cleaner Plate
1 No 1
5923004002 5923004003
See Separator Plate Separator Plate
1 No 1
below. 5923503300 5933501600
Interchangeable
Separator Gasket
1 as a set
5923503500
Air Cleaner Plate Air Cleaner Plate
Complete 1 No Complete 1
5923006001 5923006002
Screw Assembly
1
0043605100
Carburetor Gasket 1 Yes Carburetor Gasket 1
5923501900 5923504000
Oil Bottle 1 Yes Oil Bottle 1
0722105000 0722104600
Item Nos.
Cylinder Block Set Check Valve Ball Socket Head Bolt Rocker Cover Complete
5921005002 5921501800 5921501200 0119059510 5921004001
EM4250 050 211 051 061 053
EM4251 049 209 050 060 052
MS250.4 050 211 051 061 053
MS251.4 049 209 050 060 052
Cleaner Plate Separator Plate Separator Gasket Air Cleaner Plate Complete Screw Assembly
5923004003 5933501600 5923503500 5923006002 0043605100
EM4250 153 158 213 154 212
EM4251 151 156 211 152 210
MS250.4 153 158 213 154 212
MS251.4 151 156 211 152 210
Carburetor Gasket Oil Bottle
5923504000 0722104600
EM4250 146 A05
EM4251 145 A04
MS250.4 146 A05
MS251.4 145 A04
Implementation
From Oct., 2001 production