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Old August 8th, 2019, 05:21 PM   #1
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HELP!!! NINJA 250 wonít start

Recently replaced the head on my ninja 250. Went through it thinking everything was fine. But Iíve got a wall now. The bike wonít start. Itís cranking really rough
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Old August 8th, 2019, 05:47 PM   #2
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What is battery voltage?
What is battery voltage while cranking?
Do you have +12v at each coil's red wire with key ON?

Check for spark at plugs.
Check for vacuum at petcock and that petrol actually flows to carbs.
How long was carbs sitting around while you repaired head ?
Do you have multimeter? Oscilloscope?
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Old August 8th, 2019, 06:54 PM   #3
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Any chance the valve timing is off? I ask because the noise I heard could be valves hitting pistons.
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Old August 10th, 2019, 04:56 PM   #4
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That metallic tapping noise is no bueno.

You might want to start pulling it back apart and check the timing. And compression test it once you are sure the timming is correct.
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Old August 11th, 2019, 09:20 PM   #5
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