The last time i bumped started a motorbike was about 30 years ago, 1982 Suzuki gs1100gk. I was doing okay considering the weight of the beast but I couldn't quite manage to get enough speed, luckily for me a nice UPS driver jumped out of his truck and gave me the boost i needed to get it going. I've never forgotten that nice gesture. He must have been a bmw owner. Now i try to keep top quality batteries in all my rides. Thumb is easier now. scott.