So I have a 03 400ex... I drained the oil out of both tank an motor because I was adjusting the valves. I got it all back together put 1.5 quarts of oil in it started it for a few mins checked it it was half quart low put the rest of quart in it an it brought it up to full.. I let it run for a few more mins check it agine it was good, so I road it down the road maybe a mile came back checked the oil and there was nothing on stick.. so I put a half quart i it an it filled it back up tuhe next day I check it it was good road it down road and checked it nothing on stick agine.. what would cause the oil to disappear like it is.. there’s no oil leaks or nothing An I don’t wanna keep putting oil in it an over fill it...

Did you ever figure this out?? Mine has the same problem but it is a 2001