Without the TPS, the ECU won't be able to correctly calculate the ignition advance required. Earlier bikes didn't have one so you could fit an earlier ignition system. Why do you want to disable or cheat it? Running different carbs?
Yes as the engine is in a Bros chassis and the Africa carbs don't seem to work very well.I want to put the Bros carbs on as they are a known quantity and have multi position needles. also 0.5 mm bigger bore!
saw a gizmo to cheat a hornet TPS of the same era so thought there might be an xrv one.
Cheers for the reply anyway
There must be some way of transferring the TPS or modifying another similar TPS to fit on the Bros carbs. I wonder what curve the ECU uses when the TPS isn't connected. There must be a fall-back curve of some sort just in case the TPS goes bad. If it doesn't give enough advance then maybe the static timing could be tweaked with a new timing rotor assuming the later one has a dedicated ignition timing rotor on the RHS of the motor under the clutch casing.
You could book some dyno time and do runs with the TPS fixed at different positions and see which works best. When you find out the optimum position, take resistance measurements off the sensor and replace with a couple of resistors and you're done.
I experimented a while back with NTV carbs on the Alp (bigger bore), the NTV carbs had the mounting points for the TPS bracket but needed tapping, other than that a straight swap (although back on stock carbs).
I have run the bike with the TPS disconnected & could tell no difference when riding......
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