I thought I had a fuel injector issue, but it tuned out to be a timing issue instead, after buying an extra injector I thought was bad. I have over $1000 invested, but I'll let them go for $800. They have about 5 minutes run time on them. I bought smaller injectors in the meantime for my small motor they should be enough. They are E85 compatible in case someone wants to use them in that manner. Here is the homepage you can ask the manufacturer any specific questions on them, they have good tech support, they also have a lifetime warranty.
http://billetatomizerinjectors.com/Home_Page.html
http://billetatomizerinjectors.com/Home_Page.html