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Weak spark

  • Thread starter Thread starter Black 550 L
  • Start date Start date
B

Black 550 L

Guest
I have narrowed the problem down to a weak spark on cyl. #1
It is not the spark plug boots could it be the coil or is it something else?
Is there a test I could try?
 
Could be the coil, could be low voltage to the coil, could be the ignitor?
Could be a spark plug.

#1 and #4 share a common coil, does #4 have a weak spark too?
If not, the problem is after the coil, plug wires or the plug itself.
Swap them to troubleshoot, does the problem move?
 
The spark plugs on cylinder 1 and 4 fire together since they are on the same coil. Try switching the plug caps between #1 and #4 and see if the problem follows the plug wire or stays with the cylinder.
 
I switched plug wires #1 and #4 problem remains with plug #1
#1 plug is wet swapped plugs problem remains maybe I am going in wrong direction any other suggestions to help me sort this out?
 
Black 550 L said:
I switched plug wires #1 and #4 problem remains with plug #1
Click to expand...
So your ignition is good up to the plugs...

Black 550 L said:
#1 plug is wet swapped plugs problem remains
Click to expand...

Did you put in a new plug?
One that has a bright spark on another wire?

Black 550 L said:
maybe I am going in wrong direction any other suggestions to help me sort this out?
Click to expand...

Take your time, punctuate so we can understand, Give more info so we don't have to guess.

Why is the plug wet? Did it spark correctly before the plug got wet?
Wet with gas or wet with oil?
Does it run for a while and then get wet or just right away it's soaked?
Is that cylinder full of fuel or oil?
Is the engine and fuel system good other than the spark issue or do you know?
How about a little history of this bike?
 
1. New intake orings
2. Dipped carbs 24 hrs. replaced orings
3. Checked valves and shimmed
4. New petcock
5. trimmed wires on plug caps
6. spark plugs are new and good I swapped plugs
7. coil relay mod
8. new battery
9 .compression is 155 on #1 cyl.

I do not know if it is wet from gas or oil
The motor runs on 3 cyls. from the start
yes I put in a plug from another cyl. with a bright spark
I have did several things to no avail
 
Last edited:
Hi everyone Thanks for your help I couldn't of did it without everyone on the forum. I cleaned carb. #1 again. Dipped and lots of carb cleaner the bike is running better than ever now I just need to sync to get it running perfect. I do not have a sync tool so that will have to wait awhile. Thanks again
 
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