Yest did my first ever trip on my bike to a place called sirumalai(hills), around 100kms away from my place. Accompanying me were two friends on a P150. Cornering was really fun on my bike. Way back I rode doubles and was doin 85+ since the P150 guy was at 90(four lane roads!). My bike suddenly fainted and we tried starting(for half an hour) but in vain. Luckily there was a small town near. Then we went in search of a mech(on a sunday!). We woke up a mech who was tight asleep. He was generous enough to repair my bike since we had 70+kms to go. As I expected the problem was with the spark plug since the same thing had happened before when I was ripping hard with a pillion. Replaced and I rode alone between 70-80kmph. Reached home safely. Learnt good lessons.
1.Try to have company when on long tours.
2.Carry spares.
3.Never push your bike to its limits.
The best part was that my bike gave around 45kmpl.

Now coming back to the problem. Did the problem occur because the bike is not capable of carrying two people at 85+kmph? Or is there a problem with the spark plug? Note that the problem doesn't occur when I'm riding alone. I've done continously 85+ for around half an hour and there was no problem at all. The mech said one musn't do 75+ on 2-strokeys(I don't believe this!). Will appreciate a technical explanation for the problem.