Yamaha MCP Midrange Section 3

It is recommended to use Ring Free Plus ____ 

• 1oz per 50 gallons of fuel (continuous use) 

• As an oil additive for “shock treatment” only 

• 2oz per every 5 quarts of engine oil 

• 1oz per 10 gallons of fuel (continuous use) 

You should only check spark plug gap when a piston has contacted the spark plug. 

• True

• False

You can use automotive oils in your Yamaha Outboard if minimum specs are met. 

• True

• False

• Federal Compliant Watercraft 

The engine specs call for a B7HS-10 NGK spark plug, but someone has installed a BR7HS-10. How will the engine be affected? 

• The engine will not be affected. 

• The engine could skip and run rough due to excess RFI at the ECU. 

• The spark plug will overheat and lead to detonation in the combustion chamber. 

• The spark will be “delayed” and the engine will lose power. 

Why is it best to warm the engine up prior to draining and changing the engine oil? 

• This ensures any impurities will be suspended in the oil 

• To make the oil thicker for easier extraction 

• To ensure the oil filter is full of oil prior to removing / replacing it 

• To ensure the oil filter is empty of oil prior to removing / replacing it 

Which NGK spark plug is considered “hotter,” LFR5A-11 or LFR6A-12? Why? 

• The LFR6A-12 is hotter because -12 represents the heat range, and the larger number is always hotter. 

• The LFR5A-11 is colder because -11 represents the heat range, and the smaller number is always colder. 

• The LFR6A-12 is hotter because 6 represents the heat range, and the larger number is always hotter. 

• The LFR5A-11 is hotter because 5 represents the heat range, and the smaller number is always hotter. 

Which of the following should you do prior to checking the engine oil level on an engine that has been run? 

• Loosen the fill screw to vent the crankcase. 

• After running the engine, wait five minutes before pulling the dipstick. 

• Tilt the engine at least half way up for at least five minutes, then tilt down until level. 

• Ensure the engine is trimmed all the way down. 

Which of the following reasons cause engine oil to appear white or milky? 

• Fuel is blowing by the rings and diluting the oil. 

• The engine has just been run at a high RPM for an extended amount of time. 

• The engine has been idling for an extended amount of time. 

• Water has entered the crankcase and contaminated the engine oil. 

When checking engine oil level on a Yamaha, you only need to remove the dipstick once because the dipstick tube is vented to the atmosphere. 

• True

• False

Service manuals call for the engine oil capacity to be a certain amount, but the periodic maintenance quantity is different. Why? 

• Total quantity is measured in quarts, and maintenance quantity is measured in liters. 

• Oil levels change due to temperature changes. 

• Fuel that was diluted into the crankcase will not flash off. 

• All the engine oil cannot be removed.