If you have the service manual it walks you through step by step. Pull the head, cylinder, and your piston is right there attached to the rod. Off the top of my head you will need the valve spring compressor and a torque wrench but not really any other special tools.
Once you do one they are all really similiar. I tore my 110 engine top end down and put a new piston in it in a couple hours earlier this week.
If you want to do the job right, get it bored 10 over and get the matching piston kit. I skimped once on a 185 trike and just replaced the rings and it still smoked after I put it back together. Talk about disappointment. I didn't make that same mistake on my 200x. Next overbore and Wiseco piston kit and no more smoke. You get a like-new ring to cylinder wall seal.
It will cost you about $150 more to get the bore/piston kit, but it's the same amount of work once you have it torn down that far.
I've owned several Hondas over the years, with 2, 3 and 4 wheels.
Currently have a 1979 ATC 110 and 1985 XL350R enduro.
Last edited by dr. feelgood; 05-11-2011 at 12:24 PM.