"jumps" a bit on initial throttle, normal?

[twiggy2cents]

you measured chain stretch if its in spec its not stretched too much...but as stated your chain deflection(slack) and the cush drive will cause this. Next time you take the wheel of try fitting some pennies in the cush drive to take out the looseness

[MrZig]

Yours starts with no choke? I need to choke mine and if I put the choke off right away it dies immedietly.

[TheCafeKid]

Try raising your idle speed to factory speed 900-1100 RPM. Id put it at about 1000RPM and call it good. Ive notice if youve got your idle speed set to low, the motor is having a tough time just keeping going, then you feed it just a touch of gas and it wants to take off like a bat out of hell... Give a shot, it may help a bit.

[donimo]

Sorry, I didnt explain that very well, my idle is set at 1100 rpm, but if I start it with no choke it idles at about 7-800rpm.

And yeah MrZig, starts right up, if anything its HARDER to start with choke, teds to stall out forst try, plus it smokes like a bajeebus...

[katguy]

Is the bike in gear and the clutch lever pulled in?