i appreciate all the help. i am 880 ft elevation. and now that i look at the header i do see a small amount of carbon on the pipe around the port. i was planning to wrap the pipe with fiberglass, add a heat fin, and replace the El cheap o muffler that is pitted with a new El cheap o muffler that will look good for a year or two. i think that how old the one on there is. so adding a heat fin will require pulling the pipe away anyway i may as well put it back right. so I'm all ears.
well, if any of you gearheads are still out there, i didn't jump ship and swim back to japan. i wanted to go ahead and those jets before i take it apart. i just got the parts from our friends here in the states but they sent the wrong main jet. but i did take care of that exhaust leak and wrapped the pipe with fiberglass. i didn't put the heat fin on because i thought i wouldn't be able to slide it down the pipe past the wrap to check for leaks. does any one think the wrap could cause the head to run hot? i mean the heat has to go somewhere. if the wrap keeps it from radiating from the pipe then the pipe itself will retain more and its inside the exhaust port.