Check all electrical contacts for Green / White Oxidization. Clean contacts and lube with Dielectric Grease. This oxidization will cause missing under load and will not show up with test light or multi meter test. Thanks for Vid.
Nice injector cleaning tool. I made one with a tubeless tyre valve taking the core out and using heatshrink of various sizes to fit the carb cleaner nozzle into the top. Squeezing the bigger end over the injector and using a 9v battery like you did. Worked wonders and the best bit I actually saw the spray pattern inprove very quickly. Nice work mate!
