My guess first off if you've fitted the new carb that comes with the kit it's probably the best place to start.... However, don't be shy at checking the stator and your earth's.... Stators are an increasingly common issue on these. And for the sake of a 2 second ohms test could be the first easiest test to try even before even touching the carb.... A nightmare to do however.... Especially since you've probably just done all the work you need to do putting the kit on.
Let us know how ye get on.
Ps if the stator is fine.... It might be worth just trying the old carb on first just to see how it runs with it before stripping down new carb to tune it up and change jets etc
