radar, it might be time to shop around a bit for your rating.
I weigh 90kg and two of our other instructors weigh in at 95kg & 102kg respectively and we all instruct in C152's.
Of course, as has already been mentioned, a little attention to student size and fuel load is required but we have had no problems so far.
You sound really keen and committed so make some calls and find yourself someone who will help you get the rating.
Good Luck.
