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My bike has been running great for the last couple months. Yesterday I took it out for a very short ride (5 minutes) and noticed a "miss" at about 4500rpm. Today when I went out the "miss" got worse and after about 10 minutes the bike bogged down would no longer run. It would idle some but when you gave it any gas it would die.



First I thought a fuel restriction but it seemed more like riding with the choke on. I did get it started and while trying to ride home it was acting more like it was running rich (backfiring and bogging down under throttle.) I finally had to call the wife, put it in my truck and haul it home. I plan on looking over the carbs tomorrow.



Was wondering if anyone had any ideas of what to look for. I was planning on checking for a stuck choke and checking the mixture. Will replace the fuel filter and check the fuel line for kinks and petcock vacuum line also. Any other ideas should these fail? My main concern is the rapid onset of symptoms.



Thanks in advance to the suggestion
 

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This is just a guess on my part... As quick as it came on, electronic problems (CDI) sound more likely to me. Bad ground somewhere possibly. Bad tank of fuel?



If it were some debris breaking loose from somewhere and blocking a passage in a carb, I would think you'd have a cylinder go down but would be able to get it off idle. I can't see something in the fuel that would cause a sudden blockage effect both carbs at once. I may be totally wrong, but I'd look elsewhere before tearing into the carbs.
 

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This is just a guess on my part... As quick as it came on, electronic problems (CDI) sound more likely to me. Bad ground somewhere possibly. Bad tank of fuel?



If it were some debris breaking loose from somewhere and blocking a passage in a carb, I would think you'd have a cylinder go down but would be able to get it off idle. I can't see something in the fuel that would cause a sudden blockage effect both carbs at once. I may be totally wrong, but I'd look elsewhere before tearing into the carbs.
I suppose if there was a problem with the vacuum petcock it would effect both sides.



The backfiring sounds electrical though,,I would check to see if you are getting spark at the plugs first.
 

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I suppose if there was a problem with the vacuum petcock it would effect both sides.


True. Forgot about the vacuum petcocks.
 

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make sure your plugs are clean,and correctly gapped.

then bypass the fuel delivery system[carbs excepted]

bike on main stand.connect through a piece of tube.the carbs to a clean plastic bottle,container,whatever you can get your hands on.i use a small tank off a petrol garden strimmer.

this bypass,s your tank,intank filter,external in-line filter and the petcock.

try again
 
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