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Old 02-27-2015, 12:13 PM   #1
ereksonj OP
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Why is my fresh tranny fluid milky after < 10 min runtime? (air cooled engine)

So I just changed my tranny fluid in my 1982 CR480R (air cooled 2 stroke, 4 speed, left kickstart). The oil that came out was pretty milky - you could not see through it at all. I waited a long time for it all to drain and rocked the bike from side to side to make sure it was all out, until it was just a slow drip.

I put in fresh Klotz 2 stroke tranny fluid to spec (800mL). It's a red oil, and is very translucent. I fired up the bike, warmed it up, took it up and down my street a couple times and went through the gears and put it away.

After it had cooled, I took a peek at the oil again and it had already clouded up after < 10 minutes of run time.

The bike's background:
The bike is my grandfather's and I don't think it has had any service other than oil changes, air filter cleanings, and general good care. It was ported and possibly bored and had the head milled when it was new. It has never had any issues, starts first kick if there's fresh fuel in the carb, and has been a very solid bike. I have noticed that there is a very small neutral between 3rd and 4th gear that I have hit a couple of times by accident. Scares the heck outta me when I miss a shift at 60+ miles an hour... Other than that, the bike rips.
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ereksonj screwed with this post 02-27-2015 at 12:17 PM Reason: typo
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Old 02-27-2015, 12:42 PM   #2
AustinJake
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Either humidity is super high or there was water still in the engine after draining the old oil. Run it hard and hot for an hour and it might clear up, by evaporating the water in the oil.
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Old 02-27-2015, 01:02 PM   #3
ereksonj OP
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could it be anything other than water? I live in Utah and it is very dry. I also don't know how water could have gotten in there... Could washing the bike result in this?

I have a Yamaha Blaster that takes way more abuse and has way more water thrown at it, but the tranny fluid is still that nice, clear red when I look through the glass window...

The one thing I can think of is maybe I should have warmed the bike up before I drained the oil. (it was late when I did the oil and the bike is LOUD). Should I give it another flush? or do you think that would be wasted effort?
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Old 02-27-2015, 08:12 PM   #4
1fxstbi
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It might be your clutch plates causing the milky look. My KTM 200 does the same thing, cloudy oil after a ride. A mechanic friend told me that the fibers in the friction plates cause this but it does no harm. Change you oil again and see if it does the same thing, I'd bet it's the plates. To save some $$ while you experiment you might try running Rotella T, about 10 bucks a gallon at Wally World. My 2 cents...
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Old 03-02-2015, 08:42 PM   #5
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+1 on using the cheap oil in the crankcase.... fill, fire-up & run a little bit, then drain. Repeat until you get rid of the milky crap. Then re-fill the gearcase with the oil that you want to use. Sounds like you still have some condensation in there to purge.
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Old 03-04-2015, 05:13 PM   #6
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Quote:
Originally Posted by 1fxstbi View Post
It might be your clutch plates causing the milky look. My KTM 200 does the same thing, cloudy oil after a ride. A mechanic friend told me that the fibers in the friction plates cause this but it does no harm. Change you oil again and see if it does the same thing, I'd bet it's the plates. To save some $$ while you experiment you might try running Rotella T, about 10 bucks a gallon at Wally World. My 2 cents...
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Originally Posted by Duck_Pilot View Post
+1 on using the cheap oil in the crankcase.... fill, fire-up & run a little bit, then drain. Repeat until you get rid of the milky crap. Then re-fill the gearcase with the oil that you want to use. Sounds like you still have some condensation in there to purge.
I think that sounds like a pretty good idea... I just hate riding this thing up and down the street - it's the loudest bike I've ever heard and I don't like pissing off my neighbors. I think I'll change the oil after every trip and see if it starts to improve. It might take a while... Maybe I can find a place to ride where I can do oil changes on a surface other than dirt/mud/sand. I'll make sure and post back here if I can eventually solve the issue. And of course if anyone has any new input, please share.
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Old 03-08-2015, 08:49 AM   #7
vtwin
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Is it possible you have too much oil and it's the cavitation causing air bubbles in the fluid? It can happen on auto transmissions with too much oil making it look "milky", but it's really just air.
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Old 03-12-2015, 06:05 AM   #8
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Use ATF (it's cheap and is a great detergent oil) until the problem goes away. Then change to your oil of choice. You need to run that motor a lot more to really warm up the tranny. Ride it to work a couple of times.
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