No sweat, most people spam random posts to get to ten. I would visually check the shifter shaft in the middle of the shifter lever moves when you step on it, sometimes they strip. If the shaft is moving, then yes, you may have a shifter fork issue. That's pretty rare on these machines, but I guess possible as anything metal wears with time. It's a tough one, because you really don't know until you pull the motor and split the cases to get to the gears.

You posted the question late in the day on Friday and then reply 3 times over the weekend that no one has replied? Calm down and give us a bit, some of us only look at this forum when we're bored at work. I can't say if it's a shift fork without seeing it, but if it is, those parts really can be hard to come by. The better option is to pick up a similar year Bayou (I think all of the 300's are the same regardless of year but can't confirm) cheap that's trashed and use it for experience tearing down and as a parts bike. Those were extremely reliable machines (as were the 250 2WD) so finding spare parts is pretty tough. I bought one a couple years ago for $500 complete but trashed and it took me a couple of weeks to refresh it and sell it on again reliable and ready to rock.

I bought a used sportsman that was used on a Christmas tree farm. I wound up having to take just about the whole thing apart. Seemed like every time I took a part off I found 2 more that needed replacing. If you are mechanically inclined at all I found a lot of helpful information on youtube. I am 72 and it took me awhile but it is finished and worked well when we went hunting this year. Good luck to you.