I have a 98 zrt 800 with trial ported 900 cylinders, bored 39.2 MM round slides, rpc pipes, cut heads, gutted air-box, v-force reeds and a welded crank. I ported the cylinders using the sportport template system. I was wondering if anyone had and pictures/diagrams/advice for this procedure.

just looking to get a little more power out of my old tripple

No one has ported the upper case on their 800/900 triple?

If I'm out in the shop sometime soon I can snap a couple pics for you. There's a ported big block triple upper case on the bench right now that I'm using for a motor mock-up. First thing you need to do is fill one of the cavities in the stator/mag housing before you do any porting. The is another place you need to add Devcon/JB Weld to. I'l have to have a look. The place you are going to spend most of your time is whitling away at the large blocks of squared off aluminum that start right at the end of the intake tract where the reeds go. Your first time doing one of these upper cases may take over 5 hours. I can do one in about 3 now. Just be patient. Remember you can't put back what you've ground away. Well, not easily. Just work in small steps. Don't make the biggest cavernous tunnels you can in there. The name of the game is velocity and intake signal, not sheer volume. Any upper case mod, as mild as you make it, is happy company with pipes, cylinder porting and so forth.

Hope this helps

now, my crankcase is out of my zrt 800 for minor mod,I will post picture tomorow
be careful with case porting,to much porting=slow start and loose hp on dyno..... :banghead:

thanks guys
if you could post or pm me pictures or diagrams would be great!!!!!!!