Transmission Oil

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#1
I know the manual recommends using 10W30 or 10W40, but I was wondering what brand of oils most of you use and what grade you would suggest for a harescramble racer.

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BloodEclipse
00' KDX220 Mine
00' TT-R125L Son
94 XR200 Wife
 
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#2
I would reccomend castrol gtx 10w-30 or 10w-40. When I first bought my 00 KDX 220 the dealer gave me some bel-ray 85w oil. At first there was no problem but then later on when i would drive my bike hard it would make this funny humming sound from the tranny. So I decided to follow the owners manual and use castol 10w-40 next I got some recomendations here to run it a little high in the window, So far I've had no problems and i like doing it this way, just add about a quart and go! Just remember to change the oil a little more often since it's just motor oil.
Mike
 

Mikeb

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#3
I have had good luck ruinning TYPE F (not Dextron) automatic transmission fluid as have many others here. I know of people running ATF in winter and 10w-30 motor oil in the summer with good luck.Like Mike said make sure whatever you uise to change it OFTEN and go ahead and use the full quart.

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Mikeb
1998 KDX200  
http://www.justkdx.dirtrider.net
 
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#4
Mike, are you saying that it's ok to go past the fill mark and to just go ahead a dump the whole quart in? I know that when I changed the oil with the amount the manual said it appeared to be a little low.

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'00 KDX 220
'99 VFR 800
'00 XR 70 - Jr's
 
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#5
I also went through the same little thing you are, when i would poor in the exact amount the manual said it was a little low. Most people just dump a full quart in. I however just dump a quart and watch the window. If you leave about an inch left in the bottle it should be a little above mid level which is where i like it. So just watch the window, otherwise a quart is good, and it seems to get rid of some of the noise from the tranny.
Mike
 
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#6
The extra oil give the clutch bits that much more oil to suspend in, and since the tranny isn't under pressure, the extra oil isn't doing any harm.

Also, with the extra oil, it gives extra cooling surface to the cases also. Not a problem now, but 3 months from now, that will (hopefully) be a different story.
 

Sage

dirtbike riding roadracer
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#7
Redline light weight gear oil works great, Blue not Yellow, and under normal riding conditions a once a season change will be fine. If your looking for max power, don't over fill the oil, the clutch will drag in the oil and soak up the ponies.

PS. 12 gears spinning in oil will generate some pressure and push oil out of the overflow tube. :rolleyes:

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Sage Wilkinson, KDX Link 1
 

bud

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#8
Originally posted by Sage:
under normal riding conditions a once a season change will be fine.
Changing oil once a season? Am I misunderstanding you here? I've tried many different oils from expensive gear oils to bargain basement motor oil, and the one thing they have in common is after 4-8 hours of hard riding, shifting and sometimes clutching suffers. Changing the oil every 2nd or 3rd ride - the point when the oil usually starts misbehaving is the only way to go for me.
 

Sage

dirtbike riding roadracer
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#9
Try the Redline Light Weight Gear Oil, Blue. You will be impressed, I was and I dont't usually go for stuff like that, Once a Season under "normal" conditions, most of my customers only ride @ 60mi per month which is 720mi per season, I ride @ 200-250 per month and change it about every six months.

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Sage Wilkinson, KDX Link 1
 
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#10
Regardless of how great Reline oil is I would think you would still want to change it more often to remove particles from the clutch discs and basket.
 
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#11
I'd recommend once a season if I owned a service department.

I change the same as Bud, every 2-3 rides, depending on length and conditions (how hard I am on the clutch).

When I change oil, it's dirty. I'm not doing it for my health or because I like it..
 

Sage

dirtbike riding roadracer
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#12
Ask someone else that has tried it.

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Sage Wilkinson, KDX Link 1
 

dhoward

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#13
Originally posted by Sage:
Redline light weight gear oil works great, Blue not Yellow, and under normal riding conditions a once a season change will be fine. If your looking for max power, don't over fill the oil, the clutch will drag in the oil and soak up the ponies.

PS. 12 gears spinning in oil will generate some pressure and push oil out of the overflow tube. :rolleyes:

BZZZZZZZ!
Thanks for playing.

For heaven's sake, DON'T change your oil only once a season.
DO use a full quart in a KDX tranny.
Don't worry about the oil "soaking up ponies..." it ain't happenin'.
Oh, and the "pressure" from the gears spinning(?) WILL NOT push oil out of the overflow tube.

Sage, like the spice, not advice, right?

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Dan
'98 KDX 200
St. Louis, MO
 
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#14
Sage,
Does this Redline oil come with it's own internal filter, or are we just supposed to leave the abrasive particles floating around in there, all year long???

It might be the best oil on the face of the earth, but I don't remember seeing a filter in my KDX gearbox... The only way to get the bits out is with the oil.

I don't want them in my gearbox. Plain and simple. That's why I change the oil...

This isn't meant as a rip on you, or any other shop owner, but part of the posting here on DRN is info to avoid having to visit the dealer and make large donations.

We would much rather visit more often, with a good attitude, say hello, and make small donations.

It is a pay you a little now or pay you a lot later situation. I like it much better a little at a time. Free coffee helps too... :D
You would be amazed at what I didn't know what neat gadget I needed when I stop in for a little BS and coffee.
 

Sage

dirtbike riding roadracer
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#15
Originally posted by Sage:
Once a Season under "normal" conditions, most of my customers only ride @ 60mi per month which is 720mi per season, I ride @ 200-250 per month and change it about every six months.

If you're going to pull quotes from above at least pull the right ones! I'll make this real simple, for the simple minded, try to follow along:
better lubrication = less wear,
less wear = less particles in oil,
less particles in the oil = less frequent oil changes......

its not a four stroke, there no carbon deposits in the oil so it lasts longer.

As for the over-filling of oil not effecting engine drag, it will.

Case & Point: Some kart guy's run ATF in their gear boxes(CR125 & YZ125 mostly), they change it every race, they also go through 1,2 & sometimes 3 trannys per season. Other people that I know are using Redline Gear Oil and change their oil twice per season, they start and finish the season on the same tranny! A kart friend of mine turned me on to this oil and its good stuff, if you think your harder on a tranny than a pro 125 shifter kart, think again! I'm not trying to sell you a quart of oil I'm trying to save you a tranny! Do what you want, my bike has the stock tranny & clutch from 10-99 when I bought it new, it's far from stock as far as the engine goes and to boot I'm a AA rider, 6'1" 230 pounds & very abusive to the bike.

Case & Point 2: As Doug Chandler & Aaron Yates's superbike mechanic in 98-99, I have personally experienced a 3hp gain in oil level, 3qts vs. 3.6qts of oil. I know a KDX is not a superbike but physics are physics an drag is drag.

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Sage Wilkinson, KDX Link 1

[This message has been edited by Sage (edited 03-28-2001).]
 
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