2-6 ENGINE TUNE-UP - Ba tt ery, Spark Plug BATTERY Fig. 2-17 VISUAL CHECK ~ If very di r ty , remove and clean before checking. There should be no defects such as listed below : 1. Rusted battery mounting hardware. 2. Damage or leakage in battery, 3. Loose connection, rusting, deter ioration or corrosion of battery term inals. Fig. 2-18 SPECIFIC GRAVITY MEASUREMENT Hold the hydrometer so tha t the f loat wi ll not ~ contact against the cylinder wall and read the graduation. Spec ific gravity 1 .25-1 .27 Fig. 2-19 ELECTROLYTE LEVEL CHECK and REPLENISHMENT ~ Th e ele ctrolyte level should be up to the upper Lo wer level :D: level.
If low, add distilled water (or purified batter y Black case wa ter). Fig. 2-20 SPARK PLUG riiitil VISUAL CHECK ~ Conditio n is good if none of the fol lowing defects are present : 1. Cracks or damages in the th reads or insulator. 2. Wear on the electrodes. 3. Damaged or deteriorated gaskets. 4. Burnt condit ion of electrode and unde sirable carbon deposit.