Dark oil comes from contamination. And out of that the two most common ways to contaminte the oil comes from dust and combustion byproducts.
The first thing to check is your mixture. If your real rich, it will turn your oil black real fast no mater how good your rings are sealed. Take for instance a diesel. Oil (diesel) is a very dirty fuel to burn. You can change your oil in a diesel and in 10 minutes your oil will be black with soot again. That is why the new fuel injected cars don't turn their oil black real quick. Their mixture is 100% on the money 100% of the time.
Now look at propane (super clean fuel). Change your oil in a propane burner and it will look like new 10 thousand miles later.

Next check your air filter over real good. It's a good idea to grease all connection points, just to make sure.

If your mixture is right on and your oil is still turning black fast, I would then do a leak-down. Should not be above 5% or so.

 

shouldnt be black from 5 hours of riding i would think, must be pretty dirty

 

well i guess you are right bout cranking it over while dry i just didnt think a couple of turns would hurt it that bad . i thought just riding it cold was the bad part.but when i do this i usually let the bike run for a minute to warm up the oil so it will flow better out of the drain. so i was thinking there would be proper lube in the motor while it was turning over . so i did put a little thought into it .ill just run it the way that it is and deal with the dirty oil until next year when i get it all done.doesnt really make sense to put a piston and rings in for one season, it still runs awesome.thanks everyone

 

its funny, with the amount of work done on his rappy, you wouldnt think that hed turn over the motor without any oil in it... Thats probabily the entire issue, you scratched the heck out of your cylinder wall and now your engine is gonna have lower compression with a lot of blowback...

 

While the color of the oil in your case is disconcerting, it may not be entirely indicative of its condition. If you have reason to suspect a problem with the oil it would be easy to take an oil sample and send it out for spectrum analysis. The results are printed and will usually contain elements tested, abnormalities noted, and likely causes.

I purchase sample kits for roughly $10 each. The kits include a sample bottle, label, and instructions. For the cost it is a basic tool to show existing or possible oncoming problems.

 

YFZ may be correct, but, if you haven’t made this practice a habit I do not believe the damage would be to that extent. Do not take everything you read here to heart.

 

i dont take it to heart like its a bad thing but i do appreciate the responses.im no certified mechanic but i am pretty mechanically inclined.i wouldnt turn it over to start it with no oil in it ,just a few turns after it was already warmed up and had some oil already throughout the system. so i think there would actually be a lot less friction wear as opposed to starting it after sitting for a while in your garage. you know like a week or so in between rides. then i think there would be no oil whatsoever in the system.but back to the point . how else would the oil get so dark so quick. i just remembered at the time i only had about a quart and a half come out of the drain plug and i was trying to get it to pump out of the reservoir tank.also my clutch is new ,about three rides old , could this also be a cause. maybe it is breaking in . first clutch ive replaced

 

Hows the mixture? What does the plug look like?
Don't worry about turning it over with no oil in the system. Takes about 10 sec or so to prime an average auto system anyway.

 

i honestly dont know if the clutch could be a cause... Im not used to wet clutches yet... and if i may have offended you with anything that i said, sorry... hopefully its nothing, but you may want to do the oil analysis or a leakdown test... honestly, it may just be clutch material. I know that clutches get very very hot when they slip, and considering its a wet clutch, if the clutch pack was dry on your first ride, it would make the pack get much much hotter than normal, hot enough to burn oil... that may have been it.

 

no i wasnt offended you had a pretty good point. i was justresponding to Vakeros answer.my plugs been a little dark but i dont foul plugs that often. im taking it out today to see how it is . i just put a proflowwith K&N on last week and i havent ridden it yet with it. im hoping that this will lean it out just right im going to do a few plug chops to see how the circuits look. but i did soak the clutch pack over night in new oil before i installed them. i have a buddy that is a mechanic and im going to see if he can do the leak down test for me. where would i go to get the oil analysis done. how long does it take .you said it was 10 for the kit. does it cost for the analysis or does it come with chemicals to do it yourself