hi Chris checked the knurled knob connection behind the radiator looks fine also cleaned it out with airline problem still the same
Can you verify whether there's a spark when it cuts out? If you can borrow a good coil from someone it'd be worth ruling that out. Also does the rev counter do anything odd when it cuts out?
When it starts to cut out and miss, look at the rev counter when the engine's still turning. The rev counter works off the ECU. If the rev counter isn't reading anything then there's probably a power supply problem to the ecu or crank sensor or whole bike. If it's reading normally then it's likely to be between the plugs-coil-ecu or not electrical. If its behaving erratically then it may be ecu/crank sensor.
sounds obvious but try checking all h/duty earths, lives and battery connections although this one is not temp sensitive normally.
The critical bit is whether the rev counter cuts straight out and the engine is STILL turning or whether it drops to a 0 with engine revs?
You need to get it plugged in somewhere and see what's happening when it cuts. Many moons ago I had a SPS that ran fine until it got to about 80 degrees, then cut. Spent hours tracing thru it all. Turned out the TPS was breaking down under heat....soon as it hit 80 the output flat lined. Cooled it off with compressed air and it came back to life. Crank sensor is another common one, although that tends to cause misfire rather than a cut. As oneball mentions, it's probably going to be a sensor breaking down under heat..
hi oneball it ticks over and rev counter is normal i try to rev to very slowly to 2000 rpm as soon as it hits 2k the engine and revs just drop and cuts out
i wonder if i can try what you have just mentioned run it up to temp then use a air line on the tps do you all think its worth a try??????
Was just having another read through. You said when it was hot and died and you tried to restart it backfired but wouldn't run?? If this is the case then it's getting fuel and it's got a spark. So either the spark isn't happening at the right time, the valves aren't opening at the right time or the mixture's wrong.
