Makita EM2650UH Technical Information page 7

R
epair
[4] DISASSEMBLY/ASSEMBLY
[4]-7. Ignition
CHECK OF PLUG CAP
(1) Remove Plug cap from Spark plug, then detect the continuity between Plug cap
spring in Plug cap and Earth terminal of Ignition coil. It is the normal condition
when Tester shows 2.0kΩ±0.5kΩ. (Fig. 28)
(2) In case of no continuity or unstable continuity, check the connection between
Plug cap spring and Ignition coil as follows:
(A) Spray the lubricant in Plug cap, then pull out Plug cap spring together with
Ignition cable using Pliers. (Fig. 29)
(B) In case no connection or inconsistent connection, then check the condition
of Plug cap and spring. Reassemble them or replace them if they are dis-
order.
(C) Insert the end of Plug cap spring into Ignition cable then return them back
to the inside of Plug cap carefully so as not to be disconnected.
(D) Check Plug cap and spring again according to the step of (1)
to avoid poor connection causing the poor sparks of Spark plug.
CHECK OF SPARK PLUG
(1) Remove Plug cap with Plug cap spring, then remove Spark plug with Box
driver 16-17 (standard equipment).
Note: When the spark area is wet with Fuel, wipe it away with a cloth and
dry it by air blow.
(2) Clean carbonized materials on Insulated part for sparking with a wire brush.
(3) Do fine adjustment of Spark plug as drawn in Fig. 30.
Insert 0.7mm thickness gauge of 1R366 to the clearance and adjust the leg of
Spark plug carefully.
(4) Install Plug cap with Plug cap spring on Plug and connect the plug screw part
to a metal part of Engine, then pull Starter rope slowly.
The sparks can be seen when starter rope is pulled.
(5) When the sparks can not be seen, try [CHECK OF PLUG CAP] to detect the continuity. If required, replace
Plug and recheck the sparks through the above process.
DISASSEMBLING OF IGNITION COIL
See Fig. 31.
(1) Remove Cylinder cover and cable from Ignition coil terminal.
(2) Loosen two M4x20 Hex socket head bolts and remove Ignition
coil from Engine.
Note: Do not lose two spacers on the bolts as the heat protection.
ASSEMBLING OF IGNITION COIL
See Fig. 32.
(1) While attaching 0.3mm thickness gauge of 1R366 to the magnet
portion of Flywheel, set Ignition coil in place.
Note: Two M4x20 Hex socket head bolts (Fig. 31) are with
threadlocker. Therefore, when re-using them,
apply ThreeBond 1342 or Loctite 242 to the threads.
(2) After setting Ignition coil, remove the thickness gauge then turn
Flywheel by hand to check if it turns smoothly
without being stuck.
Note: Be sure to insert Spacer on
when fastening Ignition coil to Engine.
(3) Assemble Cylinder cover to Engine.
M4x20 Hex socket head bolt
(Fig. 31)
Fig. 28
Plug cap
Ignition coil
Fig. 29
Fig. 30
Fig. 31
Spacer (2pcs.)
Tab of Ignition
coil to connect
with Cable
Connector of Cable
Fig. 32
Clearance between Flywheel
and Ignition coil: 0.3mm
P 7/ 14
Earth terminal
Flywheel
Plug cap
Plug cap spring
0.6 up to 0.7mm
Leg
M4x20 Hex socket
head bolt (2pcs.)