Gear Oil | Yamaha Raider - Star Motorcycle Forums: Star Raider, V-Max, V-Star, Road-Star Forum
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post #1 of 8 (permalink) Old 07-15-2018, 10:13 AM Thread Starter
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Gear Oil | Yamaha Raider

My manual calls for SAE80 API GL-4 Hypoid transfer gear oil.
Looking online I'm finding oil like [Valvoline Mineral, SAE Grade : 80W-90], [Lucas Heavy Duty SAE 80W-90 Gear Oil], [Royal Purple Max-Gear Synthetic Gear], [Bel-Ray Hypoid 80w90 Gear Oil]. Not sure what the 90 after the 80 is, if synthetic is recommended or what hypoid is - anyone?

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post #2 of 8 (permalink) Old 07-15-2018, 10:20 AM
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when an oil has two numbers listed it is a blend of two grades.

the 80W is the cold temp (winter) rating and the 2nd number is the 100C rating
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post #3 of 8 (permalink) Old 07-15-2018, 10:26 AM Thread Starter
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Quote:
Originally Posted by KCW View Post
when an oil has two numbers listed it is a blend of two grades.

the 80W is the cold temp (winter) rating and the 2nd number is the 100C rating
Okay, so I need to find straight 80. Any idea about synthetic vs conventional or what hypoid is?

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post #4 of 8 (permalink) Old 07-15-2018, 10:30 AM
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I dont think you need to find straight 80. 70W80 or 80W90 will be fine.

Yamaha does not require synthetic oil (to meet warranty requirements).

now you got me wondering what Hypoid means -never thought about it.
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post #5 of 8 (permalink) Old 07-15-2018, 10:31 AM
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Hypoid: a bevel wheel with teeth engaging with a spiral pinion mounted at right angles to the wheel's axis, used to connect nonintersecting shafts in vehicle transmissions and other mechanisms.

so its "differential" oil as opposed to 'motor' oil, or 'transmission' oil...
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post #6 of 8 (permalink) Old 07-16-2018, 03:41 AM Thread Starter
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Apparently the gears are a hypoid design which requires hypoid gear oil.
https://khkgears.net/product-categor.../hypoid-gears/

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post #7 of 8 (permalink) Old 07-16-2018, 10:07 AM
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Quote:
Originally Posted by Highwayman View Post
Apparently the gears are a hypoid design which requires hypoid gear oil.
https://khkgears.net/product-categor.../hypoid-gears/
Hypoid gears are typically used in rear differential/final drive where drive shaft axis is perpendicular to the wheel axle. Gear boxes normally use either spur (straight) or helical gears. Helical gears are stronger and quiter, but more expensive and impose axial load on the bearings, spur gears are simpler, cheaper, but weaker and noisier. Most of the motorcycle gearboxes have spur gears just because less radial load (motorcylce weighs less than a car and engine produces lower torque) and no axial forces which allows to make gear box case walls thinner since there is no axial load on bearing supports.

The reason to use more viscous oil in the transmission is to make sure oil film sticks better to surfaces in contact. Since lubrication in a gear box is a "mist type" and oil does not have to be pushed thru small oil passages it can be thicker.
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Last edited by nurtaeff; 07-16-2018 at 11:11 AM.
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post #8 of 8 (permalink) Old 07-17-2018, 07:43 AM Thread Starter
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GL 4 gear oil doesn't appear to be readily available. Vavoline High Performance SAE 80-90 is a GL5 gear oil that says it is compatible with gearboxes that require GL4 and hypoid gears. I went with that.
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