I've ridden other people's quads/ bikes but this one is the first 4wheeler I've ever owned. I bought a 2006 LTR-450 about a month ago for a great price with no clutch. My mechanical knowledge is below average in comparison to the brains I see on this forum. I put a factory clutch back in it, and HOLY SHIT is this thing fast! WOW! Before I took it to the track I checked the oil and it wasn't showing on the dipstick. So I did what seemed reasonable to me... I started pouring and checking until I saw some... An additional quart later still no oil and I said screw it "it has oil in it" It burped oil at high RPM and I didn't play with it for long before trying to drain the catch can. There wasn't any in the catch can and it was barely spitting anything out while running. I called it a day. Research on this forum showed the the screens were clogged and that I needed to split the case(out of my league.) So I tried flushing out all of the lines and spraying brake cleaner all inside of the case. And it worked, I am pumping oil into the catch can again! There's still a lot of very fine metal in the oil but I am hoping to get that with very frequent oil changes. Now...the motor starting bogging out at around 3rd gear wide open, sometimes 2nd sometimes it would run all of the way though them. I found that extra quart of oil in airbox. I have cleaned it all out, sprayed the intake with choke cleaner, changed the plug, sprayed the injector, and tested the TPS. I was getting some low voltage in and couldn't seem to get anything out. When I put it back together, it gave worse symptoms( but similar) I determined that at this point at least that I had a bad TPS. The bike was running great when not under a load. No smoke, backfire, and sounds like a beast. Now I learned EVERYTHING about this bike through THIS forum... THANK YOU. Any help or input on what I've got going would be appreciated.