• Yamaha 90 Outboard
• Honda 90 Outboard Motor

This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 90 horsepower outboard engines were designed primarily for factory service 90 horsepower outboard technicians in a properly equipped shop. However, enough information in 90 horsepower outboard repair manuals is given for do-it-yourself or apprentice mechanics to correctly and safely perform repair work to their 90 horsepower outboard motor and components. Individuals using this 90 horsepower outboard marine repair manual should possess basic knowledge of tools and mechanical theory. The outboard marine mechanic should carefully read the text and become familiar with the 90 horsepower marine engine service manual procedures before beginning the work. Some repair procedures in this 90 horsepower outboard downloadable manual may require the use of special tools.

Manual is considered a permanent part of the outboard motor and should remain with. Of the Type Codes used in this manual to identify control and feature applications. Will be able to draw fuel from the. Honda Marine BF90A Pdf User Manuals. View online or download Honda Marine BF90A Owner's Manual. Honda Manuals tell you all you need to know about features, functions and basic maintenance procedures for operating your Honda marine equipment.

Its recommended to only use the exact tools, as specified in the factory 90 horsepower outboard manual. Most tools can be rented at local parts stores. There's nothing these 90 horsepower repair manuals doesn't cover. From 90 horsepower maintenance procedures to complete 90 horsepower outboard engine overhaul, these 90 horsepower manual covers it all. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 90 HP outboard engines were designed primarily for factory service 90 HP outboard technicians in a properly equipped shop. However, enough information in 90 HP outboard repair manuals is given for do-it-yourself or apprentice mechanics to correctly and safely perform repair work to their 90 HP outboard motor and components.

Individuals using this 90 HP outboard marine repair manual should possess basic knowledge of tools and mechanical theory. The outboard marine mechanic should carefully read the text and become familiar with the 90 HP marine engine service manual procedures before beginning the work. Some repair procedures in this 90 HP outboard downloadable manual may require the use of special tools.

Its recommended to only use the exact tools, as specified in the factory 90 HP outboard manual. Most tools can be rented at local parts stores. There's nothing these 90 HP repair manuals doesn't cover. From 90 HP maintenance procedures to complete 90 HP outboard engine overhaul, these 90 HP manual covers it all. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 90HP outboard engines were designed primarily for factory service 90HP outboard technicians in a properly equipped shop.

However, enough information in 90HP outboard repair manuals is given for do-it-yourself or apprentice mechanics to correctly and safely perform repair work to their 90HP outboard motor and components. Individuals using this 90HP outboard marine repair manual should possess basic knowledge of tools and mechanical theory. The outboard marine mechanic should carefully read the text and become familiar with the 90HP marine engine service manual procedures before beginning the work. Some repair procedures in this 90HP outboard downloadable manual may require the use of special tools. Its recommended to only use the exact tools, as specified in the factory 90HP outboard manual. Most tools can be rented at local parts stores.

There's nothing these 90HP repair manuals doesn't cover. From 90HP maintenance procedures to complete 90HP outboard engine overhaul, these 90HP manual covers it all.

Outboard motor cooling systems how they work DIY inboard outboard boat motor parts & accessories Johnson Evinrude Mercury Mariner Force Chrysler Yamaha Mercruiser OMC Cobra Parts Depts. Resources The cooling system on an outboard is a very simple and compact application. Water is inducted through the lower unit by a water pump impeller, and then forced upward to circulate throughout the powerhead, and eventually exits through the exhaust system. There are a couple of things pertaining to the outboard cooling system that need regular maintenance, or require attention from time to time. First, lets look at the typical water intake opening, and water pump assembly Figure 1.

Water is drawn into the water pump through the intake opening of the lower unit, where it passes through a cavity that ends up entering the pump itself. At that point, the impeller pressures the water into the long inlet tube leading to the bottom side of the powerhead. Regularly check water inlet grate to make sure nothing is obstructing water flow. The water pump impeller should be replaced every two years, regardless of usage. An impeller will normally go bad from dry rot attributed to non-usage more so than wearing out from excessive usage. One thing to remember on an outboard is the warning horn. You will hear a loud constant shrill whistle if your outboard is in an overheat condition.

Yamaha 90 Outboard

DO NOT ignore this warning as an outboard can totally seize up within a matter of seconds if the overheat is severe enough. This is the reason to change impeller as recommended WITHOUT FAIL! ^Click to enlarge^ Upon reaching the powerhead, water is directed towards the thermostat and bypass valve Figure3.

The bypass valve acts as a pressure relief until such time the thermostat opens and allows circulation through the powerhead to begin. Most outboard thermostats are factory designed to open at approx. ^Click to enlarge^ The two things that need regular maintenance or may cause problems are the impeller and thermostat. The impeller will be the cause of 95% of outboard overheat situations. It is rare that a thermostat goes bad, but it does occasionally happen.

If you find that a thermostat is bad, do not simply decide that you can discard it and operate regardless, like some would with an automotive application. The thermostat of an inboard plays a very crucial role in warming the engine to a satisfactory operating temperature. If an outboard is operated without a thermostat installed, it will surely suffer in some way from poor performance all the way to causing internal damage. An outboard is designed to operate at specific engine temperatures, and if it does not obtain that temperature, it will run very sluggishly, and also cause fuel/oil mixture to not totally burn, which causes excessive carbon buildup. Carbon buildup in an outboard is one of its worst enemies. This condition usually most often causes problems with the piston rings becoming stuck in the piston ring grooves.

If this happens, you can pretty well kiss your powerhead goodbye, because it most certainly will allow the piston to touch the cylinder wall, and immediate scoring will result. Once a piston/s is scored, it is only a matter of time before the engine will self destruct unless it is caught in time to perform an overhaul. In summary, change water pump without fail EVERY two years regardless of usage.

Honda 90 Outboard Motor

Also, if you operate your boat in salt water, make sure to flush your engine and cooling system after every use. Following these simple guidelines will protect your marine engine from serious damage, and the mechanical skills required are fairly minimal. If you should have any questions, feel free to email us.