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Old 12-12-2013, 06:54 PM   #1
sonoran OP
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Extra oil in 990 oil tank?

What's the downside of having a bit too much oil in the 990's oil tank?
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Old 12-12-2013, 06:55 PM   #2
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I haven't found out the hard way yet, but I keep trying
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Old 12-12-2013, 07:04 PM   #3
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I recall somebody had posted up a reason why it matters but for the life of me can't find it.
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Old 12-12-2013, 08:33 PM   #4
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Old 12-12-2013, 10:49 PM   #5
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Too much oil in engine. It will push more oil out the breather into the front carb. On extreme cases it may blow the counter shaft seal.

Put a hose on a gear oil bottle and pull out the excess. I overfill about 1 of 5 bikes I work on. It's hard to get it right. The 950's take 2.8 qts, the 990's take 3.2 qts, mostly.
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Old 12-13-2013, 06:51 AM   #6
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But how does this affect a dry sump system like the 990? The extra oil will be in the tank, not the motor.

I'm not advocating doing this, just trying to understand.
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Old 12-13-2013, 05:02 PM   #7
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I have the same problem if I check my oil after I ride it good but if I warm it up and check it its very high? funky
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Old 12-14-2013, 04:51 PM   #8
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No downside if it's just a bit as far as I'm concerned. If you don't like it suck some out as advised and ride.

I can't see how it would blow engine seals as it's scavanged at a higher rate than wot's pumped in.
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Old 12-14-2013, 05:04 PM   #9
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Quote:
Originally Posted by sonoran View Post
But how does this affect a dry sump system like the 990? The extra oil will be in the tank, not the motor.

I'm not advocating doing this, just trying to understand.
My question exactly...
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Old 12-14-2013, 10:11 PM   #10
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Mystery to me why KTM vented the dry sump system directly to the air cleaner, All the other dry sump systems I've worked on had a oil separator can between the tank and the filter. With a 2 stage drysump pump the KTM should run with pretty significant vacuum in the crankcase.

I've always checked oil on dry sumps by running at 3000 and checking or by revving to 3/4 redline for about 15 seconds then hot killing the engine then checking the oil (Quickly before it drains into the crankcase. )

Dave
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Old 12-15-2013, 10:44 AM   #11
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Quote:
Originally Posted by pdxmotorhead View Post
Mystery to me why KTM vented the dry sump system directly to the air cleaner, All the other dry sump systems I've worked on had a oil separator can between the tank and the filter. With a 2 stage drysump pump the KTM should run with pretty significant vacuum in the crankcase.

I've always checked oil on dry sumps by running at 3000 and checking or by revving to 3/4 redline for about 15 seconds then hot killing the engine then checking the oil (Quickly before it drains into the crankcase. )

Dave
I believe they do that for emissions reasons. I've routed that line to a dedicated catch bottle in the past in order too keep the air box more tidy.

ben
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