There are several YouTube videos on how to test/clean injectors. I originally rigged up a 12v battery with push button switch to pulse the injector while holding fuel pressure on the injector. Later, I bought an injector pulse tool on eBay to use. I was having injectors plug up about every tank of gas so I cleaned the tank out, installed a fuel filter (stainless inline 10 Micron) and also changed out all the fuel lines. Since doing that, I have not had any fuel related problems (knocking on wood !!). The only residual problem for mine is the decompression mechanism does not seem to work. I spoke to Motorcycle Doctor (sells on eBay) and they had seen some cam sprockets with bad decompressor springs so I bought a new sprocket assembly and installed but the problem still exists. This winter, I plan to bring in shop and try installing better/bigger wiring to the starter. I have also changed out the starter relay.