Yamaha RST90L Owner's Manual page 67

Replenishing the coolant
1. Remove the coolant reservoir cap and add coolant
until it reaches the "COLD LEVEL" mark.
Recommended coolant:
High quality ethylene glycol antifreeze containing
corrosion inhibitors.
Antifreeze and water mixing ratio: 60:40
Total amount:
5.2 L (4.58 Imp qt, 5.50 US qt)
1 "COLD LEVEL" mark
2 Coolant reservoir cap
2. Start the engine and add coolant until the coolant
level does not go down, and then stop the engine.
3. Fill the coolant reservoir with coolant until it reaches
the "COLD LEVEL" mark.
4. Install the coolant reservoir cap. Check for any cool-
ant leakage.
NOTE:
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If you find any leaks, consult a Yamaha dealer.
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