I'll tell you like I'll tell anybody.
Expect to spend 200$ on a kit and 200$ on aftermarket parts and tools.
Oh you've seen them for sale for 120$ for the 66/80cc? You'll need the 80$ you save toward the aftermarket budget that just went up to 280$ in aftermarket parts because you bought a cheap zeromodifications kit (and it's an illegal and imbalanced engine size).
400$, every bike is different and needs different s**t and once you think you have everything you need, go buy the tools you wished you had to build it with.
That being said - I buy from KingsMotorBikes because they deliver quick, that's because they are located close. I have an account with them and have spent a good amount of money with their business so I get treated well when I call them up, and when I need parts they are the fastest to get those parts to me. There is no difference in any of the kits - and to people who want to prove me wrong, I have a catalog of 60 different modified 2 stroke model kits through my bulk motor sales retailer, and I can assure everyone NONE of you have a modified kit - and NONE of the American shops house their catalog in stores.
What most people recognize as a modified kit is just an aftermarket parts salesman who puts a 20$ part on a stock kits and raises the price by 60$.
I showed a Chinese CNC company 8000$ toward engines and they gave me a catalog, all the American shops are about 30 years behind the times. Of course when I need parts how long is that gonna take?
My point is, buy from the nearest retailer so you can effectively buy parts sooner as can be possible and they'll treat you just as good as the next guy, but if you want a difference, there really isn't one.
. Just be sure to provide pics if it may help us understand the issue better, and you should be on the road in no time 
