For a 1978 Evinrude 25hp outboard, you should use a high-quality gear oil specifically designed for marine applications. The recommended type is typically a 90-weight gear oil, such as Evinrude/Johnson Gearcase Lubricant or an equivalent marine-grade oil. Always check the owner's manual for specific product recommendations and specifications to ensure optimal performance and protection.
carburator jets clogged!
No as all the inline 6 cylinder motors are a 2:1 ration and all the small inline 4 cylinder are 2:3:1 ratio
For the 80 hp Mercury, you may use any brand of gear oil that has been blended for use as an outboard motor gear lube. There are many brands available other than oem, and are specially formulated for outboard use.
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
The 5 hp Mercury outboard requires no special type gear oil. General recommendation is for a GL-5 class lubricant, i.e. hypoid 90w. Most any of the oem, or aftermarket gear lubes, manufactured for outboard use, will work just fine.
outboard motor will start and idle, but dies out under load
Quicksilver 80W-90 Premium Gear Lube
The drain plug on a 70 hp Evinrude outboard motor is typically located on the lower unit, near the cavitation plate. It's often a brass or plastic screw that can be removed to drain the gear oil. Make sure to check your owner's manual for the exact location and any specific procedures for your model. Additionally, ensure the motor is in a vertical position to allow proper drainage.
Top Gear - 1978 is rated/received certificates of: Australia:PG Netherlands:AL
my manual says, sae 90 outboard motor grease, hope i helped
For a 90hp Mercury two-stroke outboard, you should use a high-quality lower unit gear lube specifically designed for outboard motors. Mercury recommends using their own brand of gear lube, such as Mercury High-Performance Gear Lube or Quicksilver Gear Lube, which offer excellent protection against wear and corrosion. Always check the owner's manual for specific recommendations regarding viscosity and any additional requirements.
22.5 fluid ounces (or 666 ml's) per our 1994 Mercury 125 outboard manual.