I am just curious; I don't like doing things without knowing why, even though it is insignificant...c-152
Well, in my understanding of the rock method... you are basically causing a priming action to the motor. Kinda like the primer button on a lawnmower or weedwacker. Rocking causes the fuel to be sucked up and preloaded into the carb, reeds, and down the transfer ports ready for a "loaded charge" explosion of the first full kick/spark. Having the choke on will also add more fuel to the charge.
Let's say its cold out (50f) and you are out ready for the first ride of the day. Turn fuel on, choke on, and then just kick away without a routine... well, you can go from a no fuel start to flooded pretty quick.
Arigato, 1AllDave, and my brother all taught me the same method for starting any 500 2S. We don't do the rock method mostly because we ride 100% sand dunes on the 5hundies. Too hard to rock and get momentum for the vacuum needed to move the fuel. So we do it a different way.
Basically, cold start choke on. Take the kickstarter and just easily run it down 3-5 times.
This will naturally bring the piston to just before TDC. Very similiar action to the rock method. Then let the kickerstarter come to the top and very slowly push it down
past TDC one click (you will feel the piston reach TDC with full compression resistance and then pass TDC). Do this very slowly, the kickstarter will only come down about 3 inches from the top usually for this one click. Then let the kicker come back to the top and prepare for a full kick. This setup basically primes the pump. It wets the carb, reeds, and transfer ports with fuel. The piston is now barely past TDC and ready to easily be kicked fast without any kick back on your foot. It will speedily go down and up for the fire stroke. Works 100% of the time on any 500cc 2S mild to wild. If the bike is already warm, same method, just no choke.
I know I have explained it before, but this seems a little more clear.
Sly
*** Hey Cam, I was writing my post and you snuck in and posted. Too funny, but glad we are on the same "theory". ***