What kind of gear box oil should I get for a 2 stroke 50cc scooter?

Question

It's a Vento Triton R4. Great scooter, but Vento's service sucks. I didn't get a manual with it and have looked everywhere to find the factory recommended gearbox oil. No luck hearing back from Vento on it either. Thanks in advance

Answer 1

what do you have?

most are 10w-30 motor oil

Answer 2

You didn't specify the make and model but I think generally automatic transmission fluid would do fine.

Car automatic transmissions use very similar wet clutches that bike transmissions use.

I wouldn't recommend regular motor oil because the many gears in a transmission actually loads the oil more so than in a 4 stroke engine. But if you have no choice, then change the motor oil in the transmission case frequently.

4 stroke motorcycles generally combine the crankcase and the transmission into the same case. The reason bike oil changes should be followed very closely is because it is the transmission which wears the motor oil out faster than the engine would.

Answer 3

Hi Kathy,,

You should always state Make/Year/Model so You can get a Specific answer & Correct Info.

You can use a variety of different types of oil,,

as Strange as that sounds.

Motor Oil:

10w-30,10w-40,20w-50

Straight 30w or 40w

Gear Oil:

GL3,GL4,GL5

75w,,,80w,,or 75w/90

ATF(Auto Trans Fluid)

Type F is  heavier

Any type will do fine

..............

Here's more info,if you care to read

50cc 2 stroke scooters are almost Generic,,,the majority are patterned after an old ,old Yamaha design.

The gearboxes which need the oil are Very simple.

It's just a simple set of 3 reduction gears.

They are each on their own shaft,supported by Ball Bearings.

The only reason there's 3 gears and not just a single pair,is to maintain proper rotaion direction of the rear wheel.

As much as we all obsess about Lubricants,,,,that particular unit is just NOT THAT Picky about  oil.

Relatively speaking,,its a "Light Duty" application

*Low temperatures

*Low Speed

*Light loads

--and fairly robust components for the job it does.

Same boxes are used for 100's and 125/150's in lots of scooters,,,,

and Lots of scooters get "hopped-up" to Twice their original power & speed.

So when I say,,"Not Picky about gear oil",,,

I'm Not saying "It doesn't matter",,,,,but it really almost doesn't.

Yamaha itself specifies 10w-30 Grade SE motor oil.

Their scooters serve for Generations,,,Decades,, all over Asia----in what can be considered "extreme,continuous duty"

Lots of people use 20w-50 motor oil,,

Straight 30w or 40w Motor oil is also fine.

Type "F" Automatic Transmission Fluid is excellent choice.

You'll never find Any MFG recommend it,,,which is odd.

It's Made for that type of application ,while NO motor oil is.

And every property of ATF far,far surpasses any motor oil for use in gearboxes .

Go Figure.???

Several Scooters Mfgr's specify Actual GEAR OIL.

Typically Grade GL3.

75w,,,or 75w/90  weight.

That's almost the lowest GRADE  and Lightest weight Gear oil ya can get.

Someone here recently asked about using GL5 in place of GL3 gear oil,,because they could not Find GL3.

GL5 is a large upgrade in lubrication over GL3 and Fine for use in any modern scooter gear box.

"75w" gear oil SOUNDS a LOT Thicker/heavier than  10w-30 Motor Oil.

Actually,,it's approximately the same .

Gear Oil and Motor Oil are Graded on 2 Different Scales.

It's an "apples vs oranges " comparrison,as far the viscosity numbers.

I mention that because the difference in the Numbers always raises questions.

ATF,,Auto Trans Fluid,,,never has a Number Grade,,,but always Seems very watery & thin.

It's actually about 30w to 40w ,,,IF Graded on a Motor Oil scale.

So,,,almost ANY Motor Oil,Gear Oil,or ATF.

And almost anything beyond plain ol' 10w-30 is an "Upgrade".

'Bleive it or not,,it just happens to work out that way.

.........................................

Two Stroke Oil for use in the Engine is a whole 'nother story.

You want to always use a very high quality oil,,,because in That application it makes BIG Difference.

These days,,practically Any SYNTHETIC 2-Stroke OIl for Motorcyles is a good safe bet.

Everybody has their own prefferences.

Beyond that,,,just in General,,,the Synthetics all offer a certain range of properties which are very important to 2 stroke motors.

All of them will improve engine life,,,and reduce maintenance due to less carbon build-up,,

improve spark plug life,,,

and "Maybe" improve performance and fuel mileage a little bit.

They usually cost a more,,,but will eventually pay for the difference .

And they keep your scooter running better,longer.

Another thing,,,Try an NGK Iridium Spark Plug.

They usually make a Noticeable Difference

.........................................

I Re-Read your Question after You added your bike's info

See here what a difference that makes,,,lol:)

http://www.myvento.net/maintenance/trans...

http://www.myvento.net/guides-and-faqs/i...

Have Fun,,and Ride Safe