I bought a 2009 KX450 last December and have about 20 hours of riding on it. I've had a few instances where the front end washed out on me, most seriously about a month ago which resulted in a separated shoulder. The bike came with a Dunlop MX51 (Intermediate terrain) on the rear and a Motoz Terrapactor (Soft Terrain) on the front. Both are like new but I've read mixed reviews on the Motoz tire since it has directional tread.
The first time I was riding trails and wheelied up a long hill with whoops. When I brought the front wheel down it landed on a dry root crossing the trail at an angle and the front end slid out, I safely rolled off.
The second time I was riding the track at VDR and it seemed I couldn't push my speed in tighter turns without the front end wanting to wash out. I stayed up but was pretty wiped from wrestling the bike around those turns.
The last time I was going around a slower turn at Watkins and before I knew it, the front end must have caught a rut or washed out and I high-sided. I landed on my shoulder and separated it. Before I get back to riding I want to figure out what the deal is.
My suspension is sprung and valved correctly for my weight and the clickers are set very close to stock settings. I run both tires at 13psi.
As far as technique, I'm a pretty low-time MX rider but have years of trail riding under my belt. On the track, turning is probably my weakness. I've watched a few Semics videos and know to lean back when braking into the turn, then get my nuts up by the tank and my leg out when turning and accelerating out. I tend to lean forward when accelerating out of turns too. It seems I'm either fishtailing out or having to back off as the front end wants to slide out.
Any suggestions on how I can get my skill/confidence up to ride MX with confidence again? Is it the tire or tire pressure to blame? Having a separated shoulder is NOT fun and I miss the hell out of riding. Thanks!