gl1200 1 & 3 cylinders not firing


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willymac
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gl1200 1 & 3 cylinders not firing

Postby willymac » Sat Jul 02, 2016 6:04 pm



Bike was running for over a year after Poor Boy alternator install. Ran well, charged well. At a stoplight heard a "whoosh" sound and then running on two cylinders. 1 & 3 are dead cold. Where to look first? Any insight with this condition would be much appreciated.
Thanx, willymac



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dingdong
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Re: gl1200 1 & 3 cylinders not firing

Postby dingdong » Sun Jul 03, 2016 5:32 am

Possible broken timing belt on that side. Pull the cover to check.
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gipsy42
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Re: gl1200 1 & 3 cylinders not firing

Postby gipsy42 » Mon Jul 04, 2016 8:47 pm

willymac wrote:Bike was running for over a year after Poor Boy alternator install. Ran well, charged well. At a stoplight heard a "whoosh" sound and then running on two cylinders. 1 & 3 are dead cold. Where to look first? Any insight with this condition would be much appreciated.
Thanx, willymac

It sounds very strange because cylinders #1 & #4 are fired by coil #1, and cylinders #2 & #3are fired by coil #2. So both coils being 1/2 bad doesn't sound right.
This is just a thought, could be the wires be grounded?? are you sure you didn't crisscrossed the wires??
BTW, the FR is #1 and FL is #2.
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Maz
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Re: gl1200 1 & 3 cylinders not firing

Postby Maz » Tue Jul 05, 2016 2:09 am

gipsy42 wrote:
willymac wrote:Bike was running for over a year after Poor Boy alternator install. Ran well, charged well. At a stoplight heard a "whoosh" sound and then running on two cylinders. 1 & 3 are dead cold. Where to look first? Any insight with this condition would be much appreciated.
Thanx, willymac

It sounds very strange because cylinders #1 & #4 are fired by coil #1, and cylinders #2 & #3are fired by coil #2. So both coils being 1/2 bad doesn't sound right.
This is just a thought, could be the wires be grounded?? are you sure you didn't crisscrossed the wires??
BTW, the FR is #1 and FL is #2.


No, cylinders 1 and 2 (the front two) are fired by one coil and cylinders 3 and 4 (the rear two) are fired by the other coil.
If cylinders 1 and 3 (both on the right side) are dead, I would suggest the fault is not with the coils. As someone has already suggested, could be the cam belt on the right hand side.

Maz
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WingAdmin
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Re: gl1200 1 & 3 cylinders not firing

Postby WingAdmin » Tue Jul 05, 2016 9:16 pm

Check to see if you have any compression on that side. If your compression has gone away, chances are you broke a timing belt, and anything from new valves to a new engine are in your future. Whatever you do, don't attempt to run the engine like it is.




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