I went from a 570 Husaberg to a wr300. The 300 was night and day lighter and quicker turning, unfortunately the big four stroke made me lazy since I could burp it in 2nd or 3rd and go over about anything. It took just a bit of getting used to but not a huge streach. I later bought a wb 165 in addition to the 300 and enjoy them equally for different reasons. The 165 however is night and day lighter than my 300 they both turn great how I have them set up but the 165 will shine in the tightest of tight single track every time. The 165 is even less for giving than the 300. For what its worth I rode a buddies kx250 set for woods and can't stand that 250 motor and firmly believe Walt's high comp 165 with HGS pipe he built for me would give the 250 a run for its money!
When I went back to 2 strokes I went through withdraws and thought I needed a 4 stroke again but I'm over it, however I had a blast on the txc310 and even more fun on the tc250 for some reason.
Fwiw if I had a race with huge elevation changes, lots of logs and river crossings, or lots of high speed open areas I'd take the 300 because of power and more forgiveness. On most everything else I'd be faster on my 165.
When I went back to 2 strokes I went through withdraws and thought I needed a 4 stroke again but I'm over it, however I had a blast on the txc310 and even more fun on the tc250 for some reason.
Fwiw if I had a race with huge elevation changes, lots of logs and river crossings, or lots of high speed open areas I'd take the 300 because of power and more forgiveness. On most everything else I'd be faster on my 165.