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Discussion Starter · #1 · (Edited)
Hi guys, wandered if someone could advise....

I have a trx 300 big red, not sure which is the best oil to use, have been told by different workshops conflicting grades/ synthetic or nor etc, but I dont know what to believe!

Another quick one actually, sump plug threads have gone, can I re-tap it to M14 size?

Any help will be appreciated!

Cheers.
 

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Honda oil is a good oil. As long as you keep it changed regular you won't have any problems.
As for the plug you should be able to tap it without much trouble.
 

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My manual recommends Honda GN4, but if you want a quality synthetic oil, then the Amsoil that Mark posted above would be a good choice.
 

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any oil JASO-MA approved will work.

Honda Dn4
Rotella 15w40 and the T6 synthetic version 5w40
Amsoil 0w40

would be the choices i would choose from.
 

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10w-40 pennsoil works great in my 300ex i have had my 4wheeler since 2006 and ride it hard on a daily basis it has never broke down
 

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10w-40 pennsoil works great in my 300ex i have had my 4wheeler since 2006 and ride it hard on a daily basis it has never broke down
Are you using regular Pennzoil or ATV oil? If you are using regular Pennzoil, I don't know how you are doing it without damaging your clutches. Pennzoil was what I was using when I first learned about using oil without friction modifiers. My clutch started slipping and I didn't know it was because of the oil. I replaced the clutches and put Pennzoil back in it again and the clutches went back out again. I did this 3 times, before I realized the problem.

Does Pennzoil make an ATV oil?
 

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10w-40 pennsoil works great in my 300ex i have had my 4wheeler since 2006 and ride it hard on a daily basis it has never broke down
Are you using regular Pennzoil or ATV oil? If you are using regular Pennzoil, I don't know how you are doing it without damaging your clutches. Pennzoil was what I was using when I first learned about using oil without friction modifiers. My clutch started slipping and I didn't know it was because of the oil. I replaced the clutches and put Pennzoil back in it again and the clutches went back out again. I did this 3 times, before I realized the problem.
i just read that too. if it doesnt say JASO MA on the back specs then dont use it. google that brand and weight man and chech the spec sheet.

UPDATE: hopefully he is using this

http://www.lubricants.com/BuyersGuide/EngineOil/Motorcycle/PennzoilMotorcycleMotorOils10W40.php

if so he is fine. its JASO MA approved.
 

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I think the 300ex is manual clutch.

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Specifications
Model: 2000 TRX300EX
Engine Type: 282cc air-cooled SOHC single-cylinder 4-stroke
Bore and Stroke: 74mm x 65.5mm
Carburetion: 32mm piston-valve with accelerator pump
Ignition: Solid-state CD with electronic advance
Starter: Electric
Clutch: Manual
Transmission: 5-speed with reverse
Driveline: O-ring-sealed chain
 

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I think the 300ex is manual clutch.

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Specifications
Model: 2000 TRX300EX
Engine Type: 282cc air-cooled SOHC single-cylinder 4-stroke
Bore and Stroke: 74mm x 65.5mm
Carburetion: 32mm piston-valve with accelerator pump
Ignition: Solid-state CD with electronic advance
Starter: Electric
Clutch: Manual
Transmission: 5-speed with reverse
Driveline: O-ring-sealed chain
It doesn't matter if it's manual clutch or not. The fiber clutch will also slip if you use the wrong oil. That is the one that I had problems with. I had to replace the clutch fiber discs 3 times before I figured out the problem.
 

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10w-40 pennsoil works great in my 300ex i have had my 4wheeler since 2006 and ride it hard on a daily basis it has never broke down
Are you using regular Pennzoil or ATV oil? If you are using regular Pennzoil, I don't know how you are doing it without damaging your clutches. Pennzoil was what I was using when I first learned about using oil without friction modifiers. My clutch started slipping and I didn't know it was because of the oil. I replaced the clutches and put Pennzoil back in it again and the clutches went back out again. I did this 3 times, before I realized the problem.
i just read that too. if it doesnt say JASO MA on the back specs then dont use it. google that brand and weight man and chech the spec sheet.

UPDATE: hopefully he is using this

Pennzoil Motorcycle Motor Oils 10W-40

if so he is fine. its JASO MA approved.
Yeah, if he's using the motorcycle oil he will be fine. I didn't know if Pennzoil made ATV oil or Motorcycle oil.
 

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Oh, so even the manual clutch is wet? Didn't know that.
Yes, the fiber disc clutch in a manual clutch(ex. 300EX) is the same as in a semi auto(ex. Foreman) or whatever you call them. The semi auto just has the linkage hooked to the foot shifter that engages and disengages the clutch. The only other difference is the semi auto has the centrifugal clutch that allows the ATV to idle in gear, without disengaging the fiber clutches.

Both types of clutches, fiber disc and centrifugal, are wet clutches because they are submersed in the motor oil. I've never had any problem with the centrifugal clutch slipping because of the wrong oil, but that may be because the fiber disc clutch starts slipping first.
 
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