My son and I ran our first Harescramble and Enduro just this past summer...great fun even though we were dead on our feet when it was all said and done. I ran a 450 and my son ran a 230. My son is 6'1" @ 140lbs. I was in the "Big C" class and my son was in the "Little C" class. I believe they seperated the classes right around the 250cc mark. We, also, only ran for fun because we knew we'd be no competition at all.
The thing to keep in mind about the 230 is that it is underpowered, undersuspended, and overly heavy. My son's 230 was probably the weakest bike there. Mostly, we saw 125's - 250's and many were 2t's. There were several 4ts there, but I think we were pretty outnumbered. Don't get me wrong, we loved that 230...I think it's probably the best "fun bike" out there.
The HS we ran was a two-hour time limit, 8-mile loop through some pretty hilly and narrow single track (no, make that 1/2 track...at least it seemed like it at times

.) The up-hills were quite a challenge for the 230 and my son as he only has a couple years on dirtbikes. However, the more level, single track stuff was good for the bike. The electric start was a life saver several times for him. He only got about 1/2 way on the first lap before he bent his shifter and had to call it quits.
If you have any mud or small water/creek crossings that might require you to gun the bike a bit to lift the front end so you don't end up like a yard dart in the mud...the 230 may have some trouble with that. There were no big whoops/jumps in either race, so the suspension did okay for these two particular races.
The worst part about the 230 is the underpower and overheavy aspects. Otherwise, if the HS you're thinking of running in is generally flat, with few BIG hills, I think you'd be fine. No matter what, I'd say go for it. It is a great experience and worth the effort.
I concur regarding staying out of the way of faster riders. Most of the guys that passed us were very cool. My son and I NEVER put ourselves in a position to wreck just for the sake of getting out of someone's way. We would move as fast as we could to a safe pullover area of them to pass. As far as I'm concerned, if they can't understand that...then they can just pound sand! Again, most of the guys were VERY cool about it.
Go do it...you'll have the crap beaten out of you by the end of the day...but it will be worth it. We're looking forward to next season and attending several more.