Last Monday riding in traffic with 39C showing on the dash temp gauge (Jaycar) the brick started intermittently running rough and surging. Got it home and tried pressing the starter button while idling at 1000rpm. The 1000 rpm could only be obtained by using the fast idle, when pressed the engine died immediately, this showed that it was extremely rich. Further evidence of a black tail pipe confirmed this. I started suspecting incorrectly that my MAF sensor was at fault as a mates bike had suffered similarly a few years ago. I posted my problem on another site and got another couple of possibilities, kinked fuel return line and faulty temp sensor. When I fitted my fuel cooler I had to keep changing it's length and routing to prevent it from kinking. Eventually after 4-5 goes different routes and hose lengths I got it routed with no kinks. And I was fine for quite a few weeks, however I believe the 39C running in traffic softened the hose allowing it to collapse. It's sort of ironic that the device I fitted to solve hot running in traffic, was now actually the source of my problem. :hehehe I went up to Supercheap and got some heavier walled hose however as an added precaution I am trying to source a spring to go around the outside to prevent it doing the same. Preferably in stainless. A neighbor across the road has a mobile hose repair business so i'll try him first.
Regards Martin.