ninjette.org - View Single Post - Right-Hand Cylinder not firing

DannoXYZ · September 28th, 2018, 04:32 PM

What process did you use to clean carbs?

Do compression-test and post results here.

Also manually check and look at spark:

1. unplug spark-wire
2. insert spare spark-plug into plug-wire
3. ground case of spark to engine
4. crank

Is spark blue & bright? Or dim and yellow?

Just because cylinder isn't running right, doesn't mean it's only spark being problem. It could be valves, rings and sealing. It could be fuel as we haven't measured actual AFR in exhaust of that cylinder to confirm it's good or not. And if it's really spark, could be various causes such as plugs, plug-wires, coil, power & trigger wires between igniter and coil, or the igniter itself or crank triggers and their wires.

So LOTs of possible causes. Don't narrow yourself down to just one possible culprit when there's 16 others to test.

September 28th, 2018, 04:32 PM	#5
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	What process did you use to clean carbs? Do compression-test and post results here. Also manually check and look at spark: 1. unplug spark-wire 2. insert spare spark-plug into plug-wire 3. ground case of spark to engine 4. crank Is spark blue & bright? Or dim and yellow? Just because cylinder isn't running right, doesn't mean it's only spark being problem. It could be valves, rings and sealing. It could be fuel as we haven't measured actual AFR in exhaust of that cylinder to confirm it's good or not. And if it's really spark, could be various causes such as plugs, plug-wires, coil, power & trigger wires between igniter and coil, or the igniter itself or crank triggers and their wires. So LOTs of possible causes. Don't narrow yourself down to just one possible culprit when there's 16 others to test.