DezmoDog I had to replace the ECU on my '91 851. What should I be doing to "set" things with the new ECU before I take it in to the local Ducati friendly dyno and have them set the CO level or whatever it is they do with the trim screw? Current state with the 851 is it is very hard to start when cold and won't idle until the coolant has warmed up enough to move the temp gauge above the lowest temp shown. It also pops on decel occassionally and has a very abrupt on/off throttle transition when at low rpm. I would think the throttle bodies would still be balanced, and the TPS sets itself on each start? But the bike has more issues than I would expect a mere trim setting to fix. The bike has slip ons and the "appropriate" FBF chip if that matters. basically I want to do whatever set up I can at home with no dyno or gas analyzer before I take it to them to do the fine tuning.
DezmoDog From info Brad the Bike Boy posted elsewhere; "One thing to be aware of with the P7 ecu though is that it has a floating "zero" throttle reading, in as much as whenever you turn the key on, the ecu looks at the voltage coming out of the tps and the minimum voltage value it sees it allocates to 0 degrees throttle opening. As a silly example, if you held the throttle full open and turned the key on, the ecu would see 4.8V or so, but still call it 0 degrees throttle opening. Then, when you let go of the throttle and it closes onto the idle stop, it will see 350mV or so and then allocate that tps output to 0 degrees throttle opening."
griff851 First mistake, never assume things. Without equipment there's not much you can do other than check the mv of the TPS at throttle close and your battery voltage. Perhaps get keen and check ohms on sensors. You could change the fuel filter and spark plugs, that's always a good thing to do. After that the throttles have to be sync'd, and fuel pressure checked. That way base settings are done and there's a place to start to look at fueling. Then the fun begins.
DezmoDog brad black wrotehold it at 2,000 rpm and rotate the trim pot to give the highest rpm.Sounds like a great place to start, thanks!
