Modern Vespa

I was hoping someone could help me diagnois a strange problem I am having with my scoot. I was out for a ride and while going up a significant uphill grade it suddenly lost power. I pulled over to the side of the road and my scooter stalled. It started back up and continued on without any more problems. Since I recently filled the gas tank, I initially thought it might be a fuel/carb problem and that bad gas was probably the culprit. I have since replaced the gas. I went out riding again today for a long ride. On my way home I went up another big hill and experienced the same problem. Scoot started to slowly kind of bog down. I'm thinking it might also be a transmission problem. It just kind of slowed down and stalled when I got over to the side of the road. Again, it immediately re-fired and ran again without any problem. Very confused! Anybody have any similiar experiences or thoughts?

Arno1 had a similar problem on hills. If I recall, it turned out to be a problem with the spark plug lead. Something about going up hill and the way it loaded the suspension. It was causing the wire to become intermittent. Easy enough to check.

-Craig