'06 YZ450, DRD exhaust, K&N style filter, believed to be stock internals.
-parked in 2010 by a guy in California who go injured and couldn't ride it.
-bought in 2012 by a guy in Tulsa as a package deal, started it, supposedly had it rejetted, it still ran bad, parked it
-I bought it this weekend. Seller (consider the source) claims 30 hours. Chain/sprockets look stock and cases have moderate wear.
When I bought it, it would start and run, but ran like complete crap. tons of backfires, could barely get above throttle, etc. I didn't try to ride it. Previous owner changed fuel/oil.
Brought it home, pulled the carb, lots of tarnish/buildup. It had a 45P, 178M, stock needle on 4th clip. Valves measure in tolerance. I have to rotate the crank a degree or so past TDC mark to align the cam dots with the head. Pipe is clear of debri (bee's nest/etc)
I drained the tank, cleaned the strainer/petcock. New non ethanol fuel. I read the jetting thread, cleaned the carb as good as I could and put it back together with a 45P, 170M. It would barely run, idled high, would die if I blipped it. I could ease it up in the RPM's but it ran like crap.
I kept going up in jets till I got to 50P, 178M. It starts easy (maybe too easy) and runs "good" with moderate popping on decel.
The 45P wouldnt run with the mixture screw less than 2 turns out. Had to be 3 turns out to give it any throttle.
The 48P would run at 2 turns, but would pop/die if I blipped the throttle. 3 turns out and I could baby it up in RPM's
The 50P seems to idle/respond well at a hair less than 2 turns out.
50P/178M seems awefully big to me. I haven't had much seat time (15 minutes?). The bike is now in Super Moto Trim. I hope to tag it this week so I can get it out more.
Edited by gobeer net, April 14, 2013 - 04:17 PM.