Honda XR400, XR250 Service Manual cap 16-17-18
Specifications and Main Features
– Comcast Box 1: At 1900 ± 200 min⁻¹ the ignition timing is noted to be: 8° BTDC
– Comcast Box 2: The full advance was measured at 28° ± 2° BTDC at 4,300 min⁻¹ (rpm).
– Comcast Box 3: Pads of spark plugs should be gapped at 0.8-0.9mm for this model.
– Comcast Box 4: Voltages prohibited from falling below 100 V minimum is ideal for ignition coil primary peak.
– Comcast Box 5: 0.7 V minimum pulse generator peak is ideal.
– Comcast Box 6: Exciter coil peak should not have voltages under 100 V minimum.
– Comcast Box 7: The 20 degree Celsius unit and 68 Fahrenheit unit suggests a headlight rated 12 V 35 / 35 W.
– Comcast Box 8: At 20°C / 68°F a moped lightning coil fares well with AC 0.2-1.29 Ω, DC 0.2-1.29 Ω
– Comcast Box 9: Voltage ranging between 12.0 - 14.0 V commutation at 3,000 min⁻¹ (rpm) is suitable for AC regulator.
– Comcast Box 10: 12 N-m torque ranges suited for moped crankshaft hole cap, spark plug torque ranges Mounting torque: 8 N-m, 10 N-m.
– Comcast Box 11: Restart without pass ignition pulses guide low voltages @ 0.86V Always use peak voltage adaptor 07HGJ - 0020100 with available digital multimeters configuration.
– Comcast Box 12: Imrie diagnostic tester model 625 aids in a suitable tool required to reach optimal settings.
Frequently Asked Questions
Q: What are the ideal settings or gaps for a spark plug?
A: 0.8 to 0.9 mm (0.031 – 0.035 in) is the optimal range.
Q: Are there specific methods for checking timing?
A: Yes, please warm the engine and disconnect the marking bolt’s cap. Insert a timing light and a tachometer in order to access if the ‘F’ mark on the flywheel is coinciding with the index notch once the engine reaches 1300 +- 100 min 1 r.p.m.
Q: In a case where there is no spark on the plug, how do I go about it?
A: The first thing you want to check is loose and poor contacts that could possibly have an effect on the measurement of each peak voltage. Following that check the ignition coil and the spark plug.
Q: What is meant by primary peak voltage and what is its relevance to the ignition coil?
A: The primary peak voltage should be equal to 100 volts as a minimum.
Q: How reliable are these actions in checking for a defective ignition system?
A: Always start with a thorough visual check in case of poorly connected/corroded connectors. Only then proceed with the checks for individual components.
Q: What should be the normal lighting coil resistance?
A: Normal resistance according to the specification stands at 20 degrees Celsius or in Fahrenheit 68 VV should range from 0.2 to 1.29 ohm.
Q: What voltage does the AC regulator need to deliver?
A: AC regulators are to output a required voltage value of 12.0 - 14.0 V at a spindle speed of 3000 rpm.
Q: What tools are suggested to be used for the diagnostics purpose?
A: For the purpose being mentioned, I would suggest using the Imrie diagnostic tester, model 625 and also a peak voltage adaptor along with a digital multimeter having a minimum impedance of 10 MΩ.
User Manual
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