Welcome good to see you here.
The main think is making sure the chain and sprockets are aliened and the sprocket is lined up and down as well as sideways. I have a cheap 80cc kit I got off eBay and put a gallon throw it in less then a week. I am getting ready to go to the hospitial so it will be weeks or months before I drive her again.
Here is my first build and starting on my second build.