Front sprocket cross over
 

Is there a front sprocket that crosses over I'm in need of a new sprocket for my 07 EC 250.Also do any of you just turn them around when they start hooking or just replace.Thanks Mike

Your best bet in a front sprocket is here:

http://www.dirttricks.com/ordering_sprockets.htm

My last was a sprocket specialist and didn't last as long as I would have liked so this will be my next for $7 more.

I have always had great luck with Talon sprockets. There is a company in the UK called Motomerlin who is selling them including shipping for less than i can buy any sprocket here. They have had an amazing selection every time I have purchased sprockets from them. I actually picked up an 11 tooth just for giggles. Still was only $18 including shipping.

I don't believe anything Jap/KTM crosses over. I think TM does but that doesn't help much.
+1 on the Ironman sprockets... they are very good. They are thru-hardened if I recall correctly. It will be the last one you will buy for a long, long time.

I haven't pulled my front sprocket in a while, but I believe it is asymmetric/offset profile to it. So, you can't flip it without messing up the sprocket alignment with the rear and probably risk scrapping your engine case.