I just had the 3rd gear on my 07 CRF250 broke (around 100 h on the bike), and was wondering if anyone had the same thing happened. I did my first crankcase splitting, and if you take your time, then it's not that difficult. While the motor is opened, I will change the crankshaft and some bearings (and piston, and cam chain, and ....etc). Are there any tricks I should be aware of (or special tools) to remove the crankshaft bearings (A on picture), and countershaft bearing (B on picture), or am I better off going to my dealership (or machine shop)? I tried to remove the torx screws (crankshaft bearing holder plate), and so far ... no luck.