08-04-12, 11:15 AM
How bad is the flat spot at 5/6000 rpm? That's where one is engineered in to get the bike through the noise tests. Are you on stock downpipes and can?
I hope the TPS adjustment did the trick. If not, might be worth either swapping it or at least checking the output. A meter across the lower two terminals should show a smooth variation from roughly 1kΩ to 4.4kΩ as you open and close the throttle, if the track is dirty you'll get higher or even open circuit readings at some points. No, just unplugging and replugging the TPS doesn't mean you need to go though the adjustment routine.
Yes, the ECU is pretty dumb... it doesn't need to be set up, just plugged in. Those on some vehicles have loads of sensors and injector characteristics to "learn", our carburetted engines don't have to worry about keeping those fragile catalysts alive so the only thing it'll need is another TPS position check.
Does the 8000 rpm hesitation happen regardless of throttle position? If you hold the throttle open at 4000 and just let the bike accelerate it will eliminate some possible causes of the problem 'cos the butterflies and TPS position won't be changing. An ECU or coil fault that only occurs at one particular engine speed sounds a bit unlikely... and the only other things that would be moving are the carb slides.
I hope the TPS adjustment did the trick. If not, might be worth either swapping it or at least checking the output. A meter across the lower two terminals should show a smooth variation from roughly 1kΩ to 4.4kΩ as you open and close the throttle, if the track is dirty you'll get higher or even open circuit readings at some points. No, just unplugging and replugging the TPS doesn't mean you need to go though the adjustment routine.
Yes, the ECU is pretty dumb... it doesn't need to be set up, just plugged in. Those on some vehicles have loads of sensors and injector characteristics to "learn", our carburetted engines don't have to worry about keeping those fragile catalysts alive so the only thing it'll need is another TPS position check.
Does the 8000 rpm hesitation happen regardless of throttle position? If you hold the throttle open at 4000 and just let the bike accelerate it will eliminate some possible causes of the problem 'cos the butterflies and TPS position won't be changing. An ECU or coil fault that only occurs at one particular engine speed sounds a bit unlikely... and the only other things that would be moving are the carb slides.