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post #1 of 15 (permalink) Old 09-28-2012, 04:30 PM Thread Starter
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Question No ignition

The problem is this, the bike can be running fine for quite a while. Then suddenly it is as if all power is cut. This happens for a couple of seconds at most. Then the rear cylinder begins to fire and the bike runs on one cylinder. While riding on one cylinder, intermittently the front cylinder will start to fire, and then dies. Once it actually resumed firing for several minutes only to stop once again before I got home. While riding with one cylinder, on occasion the bike will lose all power momentarily then resume firing on the rear cylinder. It ALWAYS starts with both cylinders running. It seems to only cut out after riding 20 minutes or more.
On a rare occasion, within a minute or two after starting to ride, there will be a blip where it feels like the power is cut; not even for a second. Then it goes on running for about 20 minutes and does the cycle described.
I checked the wiring under the gas tank and the connections. I checked the ground cable. I checked the connections under the battery. I replaced the front Ignition Coil. I checked the fuses. I even have a new battery. Same thing keeps happening.

HELLLLLLLLLLLP!

Rodd
'95
mine 05/09 19.5k; 11/09 30k
DONE
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post #2 of 15 (permalink) Old 09-28-2012, 04:40 PM
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First thing I'd look at would be the ignition switch. Take the bike out again and when it starts acting up, jiggle the key. IF the symptoms improve, then remove ignition switch and clean it up. Otherwise, the problem could be stemming from somewhere else.

Does the problem arise when the bike has less than half a tank of gas? If so, then search for POOG's.

Others will chime in soon to provide an opinion.

Good luck.

I only understand what I don't understand.
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post #3 of 15 (permalink) Old 09-28-2012, 05:20 PM
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I'm thinking that the ignition swith would cut all power. do the lights remain on when this happens?

It sounds like a possible fuel issue....or lack of fuel....clogged jets maybe??

It also could be a thermal issue causing the electrics to fail. Check the 12V input connections to the coils to make sure they are clean and tight.
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post #4 of 15 (permalink) Old 09-28-2012, 05:20 PM Thread Starter
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Exclamation Ignition switch?

I am losing one cylinder consistently. The other generally runs fine. I made it back 40 miles on one cylinder. I do not understand how it can possibly be the ignition switch!?

Rodd
'95
mine 05/09 19.5k; 11/09 30k
DONE
RAM Mount
Kuryakyn 12 volt socket
mirrors
paint Speedo and Tach
LED turn sigs
LED Brake
KAW luggage rack
Spiders Den Laptop Bag
KAW Saddlebag kit
Bridgestone Exedras
Protac Backrest
JJCyclepass
Coastered
Kuryakyn Levers, Grips & Throttle Boss
Spencer seat w/B&H cover
new ignition switch
handlebar clock
cup holder
Mutazu bags
LED Bulbs
V&H Cruzers
New Fuel Tank & Fenders
windscreen

TO DO
Hiway pegs
Rodd is offline  
post #5 of 15 (permalink) Old 09-28-2012, 05:24 PM Thread Starter
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Replaced boot on carbs months ago so fuel problem is doubtful. This seems to be electrical and possibly a short somewhere but I cannot find any breaks in the wiring harness. A key factor I believe is that the front cylinder only dies after running for a while. When it cools down it runs fine again.

Rodd
'95
mine 05/09 19.5k; 11/09 30k
DONE
RAM Mount
Kuryakyn 12 volt socket
mirrors
paint Speedo and Tach
LED turn sigs
LED Brake
KAW luggage rack
Spiders Den Laptop Bag
KAW Saddlebag kit
Bridgestone Exedras
Protac Backrest
JJCyclepass
Coastered
Kuryakyn Levers, Grips & Throttle Boss
Spencer seat w/B&H cover
new ignition switch
handlebar clock
cup holder
Mutazu bags
LED Bulbs
V&H Cruzers
New Fuel Tank & Fenders
windscreen

TO DO
Hiway pegs
Rodd is offline  
post #6 of 15 (permalink) Old 09-28-2012, 05:27 PM
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Quote:
Originally Posted by Rodd View Post
I am losing one cylinder consistently. The other generally runs fine. I made it back 40 miles on one cylinder. I do not understand how it can possibly be the ignition switch!?
I'd say disconnect the fuel lines from the petcock and point the nipples down. Take a small hose and suck on the vacuum. See if both sides are flowing fuel properly.

Have you ran any seafoam lately? Could be gunk gumming up the floats and or needles.

Have you checked for spark on the one cylinder? Take out the plug and ground it to the engine while attached to plug wire.

I am certain there are other causes for your problem. As you can tell, one problem can have many solutions.

I only understand what I don't understand.
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post #7 of 15 (permalink) Old 09-28-2012, 05:57 PM
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Check the air gap on your pickup coils. They should be set around .020-.024 gap, (search pickup coil modification ) One or both may be way off.

JM2001

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post #8 of 15 (permalink) Old 09-28-2012, 06:00 PM Thread Starter
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BTW...
The tach stops working every time the front cylinder shuts down. It resumes each time the front cylinder resumes running.

Rodd
'95
mine 05/09 19.5k; 11/09 30k
DONE
RAM Mount
Kuryakyn 12 volt socket
mirrors
paint Speedo and Tach
LED turn sigs
LED Brake
KAW luggage rack
Spiders Den Laptop Bag
KAW Saddlebag kit
Bridgestone Exedras
Protac Backrest
JJCyclepass
Coastered
Kuryakyn Levers, Grips & Throttle Boss
Spencer seat w/B&H cover
new ignition switch
handlebar clock
cup holder
Mutazu bags
LED Bulbs
V&H Cruzers
New Fuel Tank & Fenders
windscreen

TO DO
Hiway pegs
Rodd is offline  
post #9 of 15 (permalink) Old 09-28-2012, 06:00 PM
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unless you tore the carbs apart for cleaning, they could still have debris in the jets clogging them.

Is your tank clean? any rust inside that could make it's way to the jets?

how do the plugs look?
are the front plugs running lean? or wet with fuel?
how does it compare to the rear plugs.
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post #10 of 15 (permalink) Old 09-28-2012, 06:02 PM
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Quote:
Originally Posted by Rodd View Post
BTW...
The tach stops working every time the front cylinder shuts down. It resumes each time the front cylinder resumes running.
tach runs of the electrical signal on the front coil.

Check your connections to the coil...the 12v connection could be dirty or loose.....no 12V will not allow it to fire.
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