-17-
• Cylinder and scavenging cover
Lip portion
Scavenging Cover (A) [74]
Intake (CS51) [48]
Intake Packing (C51) [47]
Cover Packing (C51) [18]
Scavenging Cover (B) [17]
Cover Packing (C51) [18]
Decomp. [45]
Cylinder [73]
Cylinder Packing (C51) [75]
Hex. Socket Hd. Bolt
M5 x 12 (Precote) [38]
Seal Lock Screw M4 x 10 [16]
Seal Lock Hex. Socket Hd. Bolt
M6 x 20 [37]
Spark Plug BPM-7A/BPMR7A [46]
Seal Lock Screw M4 x 10 [16]
Cab. Insulator Rubber [49]
Carburetor Insulator (C51) [50]
11. Disassembly and reassembly of the piston and piston ring
[Tools required]
Ɣ Long-nose pliers
Ɣ J-359 jig (No.6695741) (piston pin extraction tool ass’y)
Ɣ Hex. socket hd. bolt M5 x 12
Ɣ Round bar 9.8 mm in diameter (e.g., borer 10 mm in diameter)
(1) Disassembly
Ɣ Remove the two Circlips [78] with long-nose pliers.
Ɣ Insert a hex. socket hd. bolt M5 x 12 into the
pushing side of the Piston Pin [85], and then turn
the pin pullout bolt of the J-359 jig (piston pin
extraction tool ass’y) clockwise to pull out the
Piston Pin [85].
CAUTION: Do not scratch the Piston (44) (M) [77].
(2) Reassembly
Ɣ Do not reuse the Circlips [78].
Ɣ When removing the Piston (44) (M) [77], remove
carbon deposits on top of the Piston (44) (M) [77]
by being careful not to scratch the piston surface,
and then carefully clean the Piston (44) (M) [77] by
using gasoline.
Ɣ If the Piston Ring [76] does not move smoothly, remove carbon deposits on the ring groove of the
Piston (44) (M) [77] and Piston Ring [76], and then carefully clean these parts by using gasoline.
• Removing the piston
Hex. socket hd.
bolt M5 x 12
Pin pullout bolt
J-359 jig
(piston pin extraction tool ass’y)
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