KTM 250 RC
Startup setup:
| Plug type: EC36 | ||
| Pin no. | Pin’s name | Pin’s connection |
| 1 | TPS IN | Throttle position sensor |
| 2 | IAT IN | Intake air temperature sensor |
| 3 | P259 ch.4 | Low current output (350 mA), relay control, etc. |
| 4 | P259 ch.0 | Low current output (350 mA), relay control, etc. |
| 5 | GND | Ground |
| 6 | Injectpr G ch. 64 | Gives signal to an injector |
| 7 | Injector A ch. 1 | Gives signal to an injector |
| 8 | Injector E ch. 64 | Gives signal to an injector |
| 9 | Injector E ch. 16 | Gives signal to an injector |
| 10 | Ignition output 07 | Gives ignition signal |
| 11 | Ignition output 04 | Gives ignition signal |
| 12 | Ignition output 05 | Gives ignition signal |
| 13 | Secondary trigger (CAM) | Unused pin |
| 14 | CLT | Coolant temperature |
| 15 | Fuel relay (P259 ch.5) | Fuel pump relay |
| 16 | P259 ch.1 | Low current output (350 mA), relay control, etc. |
| 17 | Injector H ch. 128 | Gives signal to an injector |
| 18 | Injector F ch. 32 | Gives signal to an injector |
| 19 | Injector B ch.2 | Gives signal to an injector |
| 20 | Injector D ch. 8 | Gives signal to an injector |
| 21 | GND | Ground |
| 22 | GND | Ground |
| 23 | Flyback (to injector) | HIGH-Z flyback diode for the injector (40V) |
| 24 | Ignition output 06 | Gives ignition signal |
| 25 | 12V from battery | +12V battery source |
| 26 | GND | Ground |
| 27 | Primary trigger (CKP) | Crankshaft sensor |
| 28 | +5V battery | +5V battery source for the sensors |
| 29 | TPS battery | Battery source for the throttle position sensor |
| 30 | C259 ch. 7 | Low current output (350 mA), relay control, etc. |
| 31 | P259 ch. 6 | Low current output (350 mA), relay control, etc. |
| 32 | GND | Ground |
| 33 | Ignition output 01 | Gives ignition signal |
| 34 | Ignition output 02 | Gives ignition signal |
| 35 | Ignition output 00 | Gives ignition signal |
| 36 | Ignition output 02 | Gives ignition signal |
| Plug type: EC18 | ||
| 1 | Analog ch. 0/Knock 1 (depends on specification) | Unused pin / knock sensor can be connected to it |
| 2 | Analaog ch. 5 | |
| 3 | Analaog ch. 2 | |
| 4 | Stepper A | IACV |
| 5 | Stepper C | IACV |
| 6 | Analog ch. 6/MAP IN (depends on specification) | Manifold pressure sensor/measures intake pressure |
| 7 | WBO2 pump negative (-) | LSU 4.9 pin 5 |
| 8 | Wheel speed input | |
| 9 | WBO2 pump positive (+) | LSU 4.9 pin 6 |
| 10 | Stepper D | IACV |
| 11 | Stepper B | IACV |
| 12 | Analog ch.7/secondary VR (depends on specification) | Unused pin/secondary crankshaft sensor can be installed |
| 13 | WBO2 nerst signal | LSU 4.9 pin 1 |
| 14 | RS232 DSUB pin 3 | Peripherial port (it is needed for computer connection) |
| 15 | RS232 DSUB pin 2 | Peripherial port (it is needed for computer connection) |
| 16 | Analog ch. 1/1-wire interface (depends on specification) | unused pin |
| 17 | GND | Ground |
| 18 | WBO2 heater | LSU 4.9 pin 4 |
A picture from the trigger settings:
We will use the VEMS V3 ECU.
The engine’s specifications:
| Combustion | 4 stroke internal combustion |
| Number of cylinders | 1 |
| Valves | Double overhead camshafts, 4 valves per cylinder |
| Cooling | Liquid-cooled, permanent circulation of coolant by water pump |
| Engine displacement | 248.8 cm3 |
| Bore x stroke | 72 x 61.1 mm |
| Compression ratio | 12.5:1 |
| Lubrication | Wet sump |
| Intake valve diameter | 29 mm |
| Exhaust valve diameter | 24 mm |