What can cause one cylinder to not fire? - VTXOA
 
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post #1 of 9 (permalink) Old 02-02-2017, 11:22 PM Thread Starter
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What can cause one cylinder to not fire?

My front cylinder stopped firing. I am going to check my plugs and my coil. If it isn't my plugs should I go ahead and order a new coil or could it be some other cause? If so, what? My bike has about 70,000 miles on it. Its a 2007 vtx 1300 S. Thanks... John.
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post #2 of 9 (permalink) Old 02-03-2017, 12:08 AM
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Why do you think it's not firing?

How old are the plugs?

Insure you're getting spark from both wires.

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post #3 of 9 (permalink) Old 02-03-2017, 12:14 AM
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My 1300 will do it sometimes.
Moisture in wires and dirty common ground.

Clean and new application of dielectric grease usually takes care of it.

05 1300S 6901 miles at start 114600 now
03 1800 R 64100 at start 80500 now dyno results 97.55 HP 110.22 torque
80550 E4 front
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post #4 of 9 (permalink) Old 02-03-2017, 01:23 AM Thread Starter
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Oh, I should have said the front cylinder is missing... only making power from back cylinder.... bike has little power but runs... if you put your hand behind pipe from back cylinder lots of hot air pulses out like normal but pipe from front cylinder produces very weak and kinda cool air. Also the sound is just pop pop pop... like the motor is firing every other time. Tomorrow I will try to check everything out as best I can. Thanks for the comments. Would a dirty common ground only affect one cylinder? And where is the common ground?
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post #5 of 9 (permalink) Old 02-03-2017, 01:30 AM
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Ground s at front coil

05 1300S 6901 miles at start 114600 now
03 1800 R 64100 at start 80500 now dyno results 97.55 HP 110.22 torque
80550 E4 front
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post #6 of 9 (permalink) Old 02-03-2017, 10:28 PM Thread Starter
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Well I found out the coil is working. I cleaned the ground and then pulled the spark plug and put the spark plug next to the engine and spark jumped across to the engine. On Monday I plan to buy some new plugs and see if the bike runs right. I bet it does. I gotta work this weekend though so I can't do that yet.
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post #7 of 9 (permalink) Old 02-06-2017, 12:40 PM
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I would take compression test . Without good compression, nothing you do on the tune-up end will help. You could need to adjust the valves . Good luck.
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post #8 of 9 (permalink) Old 02-07-2017, 07:52 PM Thread Starter
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Yes, I think I have a valve problem....maybe. I got new spark plugs and it didn't help. There is no air pressure coming from the tail pipe from the front cylinder. Could a valve be sticking? The bike was running pretty good the last day I rode it and I pulled into the garage and killed it and then the next morning when I started it, it was only running on one cylinder. How could that happen????????????
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post #9 of 9 (permalink) Old 02-08-2017, 07:30 AM
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Check the valve adjustment

05 1300S 6901 miles at start 114600 now
03 1800 R 64100 at start 80500 now dyno results 97.55 HP 110.22 torque
80550 E4 front
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