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SECTION 4.4
DIAGNOSTIC TESTS
Page 129
PINION
Figure 13. Check Pinion Gear Operation
(Single Cylinder)
TOOLS FOR STARTER PERFORMANCE TEST:
The following equipment may be used to complete a
performance test of the starter motor:
• Aclamp-onammeter.
• Atachometercapableofreadingupto10,000rpm.
• Afullycharged12voltbattery.
MEASURING CURRENT:
To read the current flow, in AMPERES, a clamp-on
ammeter may be used. This type of meter indicates
current flow through a conductor by measuring the
strength of the magnetic field around that conductor.
Figure 14. Clamp-On Ammeter
TACHOMETER:
A tachometer is available from your parts source.
The tachometer measures from 800 to 50,000 rpm,
(see Figure 15).
Figure 15. Tachometer
TEST BRACKET:
A starter motor test bracket may be made as shown
in Figure 16. A growler or armature tester is available
from an automobile diagnostic service supplier.
METAL STOCK
1/4" THICK STEEL
12"
1.0"
4"
2"
2.625"
3.5"
0.5"
0.5"
DRILL TWO HOLES — 1/2"
FOR STARTER
MOUNTING BRACKET
DRILL TWO HOLES — 1/2"
FOR MOUNTING TACHOMETER
TAP FOR 1/4-20 NC SCREWS
Figure 16. Test Bracket
REMOVE STARTER MOTOR:
It is recommended that the starter motor be removed
from the engine when testing starter motor perfor-
mance. Assemble starter to test bracket and clamp
test bracket in vise, Figure 17.
TESTING STARTER MOTOR:
1. A fully charged 12 volt battery is required.
2. Connect jumper cables and clamp-on ammeter as
shown in Figure 17.
3. With the starter motor activated (jump the terminal on the
starter contactor to battery voltage), note the reading on
the clamp-on ammeter and on the tachometer (rpm).
Note: Take the reading after the ammeter and
tachometer are stabilized, approximately 2-4
seconds.
4. A starter motor in good condition will be within the fol-
lowing specifications:
V-twin Single Cylinder
Minimum rpm 3250 4500
Maximum Amps 62 9
DC CONTROL
PART 4