dirty oil after only 1hr riding

after changing the oil , completely drained ,& cleaning the s/s oil filter on my 03 wr450f ,the oil becomes quite dark , nearly black after only 1hr riding .Is there a problem with the clutch plate material , could this be caused by the previous owner not changing oil often enough, i am using castrol r4 superbike , a fully synthetic 5w-40 oil , if anyone can help please do.

Did you do the oil change prior to this one? If the oil changes have been neglected the fresh oil will pick up deposits inside the engine. Further oil changes would get progressively cleaner and stay that way longer.

If you did the last oil change to and the interval was not extended then I would certainly be inspecting the clutch.

after changing the oil , completely drained ,& cleaning the s/s oil filter on my 03 wr450f ,the oil becomes quite dark , nearly black after only 1hr riding .Is there a problem with the clutch plate material , could this be caused by the previous owner not changing oil often enough, i am using castrol r4 superbike , a fully synthetic 5w-40 oil , if anyone can help please do.

Or, if your bike is tired, blow-by around the rings will contaminate the oil in a hurry. How many hours/miles on the bike? Do you know if the top end was ever freshened up?

not knowing the history of the bike,i can say it runs very nice , having been around bikes for a while.

having just bought the the bike i decided to change the oil and install s/s filter.The paper filter looked very poor indeed.After riding the bike the clutch was a bit grabby ,so i decided to drain some oil , not all of it & top up with a heavier mineral oil.Hence my shock horror at the color of the oil.

Mixing synthetic and mineral oils is usually not the best idea, they aren't always compatable with each other. Synthetic oil shouldn't produce a grabby clutch. Solo is right about the new oil picking up the sludge left behind by the previous owners poor service record. If the clutch is grabby and the bike is "new" to you then I would suspect a worn or grooved clutch basket. May be a good time to do a few quick oil changes to flush the bike out and then inspect the clutch for wear. WR Dave.

thank you i will do just that!

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