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Y04088-WW-1


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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3) Socket Head Bolts (0119059500) have been replaced by Socket Head Bolts (0119059510) as shown below.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



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