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MAINTENANCE
7-4
J0C
l Before charging: only add distilled
water if fluid is below the top of the
plates, and then add just enough to
cover plates.
l After charging: open the vent caps
and look inside the fill wells. Add
distilled water until the electrolyte
level is 3 mm (1/8") below the
bottom of the fill well. A piece of
rubber can be used safely as a
dipstick to help determine this level.
Clean, replace and tighten all vent
caps.
Normal tap water contains
minerals which are harmful to a
battery; therefore, refill only with
distilled water.
3. Using a hydrometer, check the
specific gravity of the battery fluid
in each cell against the readings
on the chart below. Consult a
Yamaha dealer if any low readings
are found, or if readings vary more
than one point between cells.
Temperature
Satisfactory Uncorrected
°C °F
Hydrometer Reading
48.9 120 1.244
43.3 110 1.248
37.8 100 1.252
32.2 90 1.256
26.7 80 1.260
21.1 70 1.264
15.6 60 1.268
10.0 50 1.272
4.4 40 1.276
-1.1 30 1.280
Y-936a
1/8”
(3 mm)
Electrolyte 1/8” Below
Bottom of Fill Well
Max. Level -
discharged battery
Max. Level -
charged battery
Fill Well
Electrolyte
Y-937c
J0C-F8199-60.qxp_LIT_19626_16_05.qxd 6/27/16 2:50 PM Page 27
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