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Post by luv2huntnd on Nov 5, 2015 15:04:20 GMT -6
I am in need of some help figuring out a issue that I am having with the carbs on my bike. It has been a couple years since I have ran my bike due to revamping the frame and front end. I cleaned the carbs prior to firing up the bike and found that only the right cylinder was firing. I then removed and again cleaned the carbs. when I replaced the carbs, now the left cylinder is firing and the right is not. I can rev the engine and the cylinder will start firing, or if I cup my hand over the opening of the carb it will start firing. And before it is suggested, I have adjusted the valves on the engine. about 200 miles ago the motor was completely tore down and checked over. I am at wits end trying to solve this problem. I am hoping that someone has experienced this before and may have possible solutions to try.
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Post by Blaine on Nov 5, 2015 15:13:32 GMT -6
I am in need of some help figuring out a issue that I am having with the carbs on my bike. It has been a couple years since I have ran my bike due to revamping the frame and front end. I cleaned the carbs prior to firing up the bike and found that only the right cylinder was firing. I then removed and again cleaned the carbs. when I replaced the carbs, now the left cylinder is firing and the right is not. I can rev the engine and the cylinder will start firing, or if I cup my hand over the opening of the carb it will start firing. And before it is suggested, I have adjusted the valves on the engine. about 200 miles ago the motor was completely tore down and checked over. I am at wits end trying to solve this problem. I am hoping that someone has experienced this before and may have possible solutions to try. Did you clean/adjust the idle mixture jets/screws?
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Post by luv2huntnd on Nov 5, 2015 15:30:52 GMT -6
I have. They were set back at 2 1/2 turns out.
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Post by Blaine on Nov 5, 2015 18:50:24 GMT -6
I have. They were set back at 2 1/2 turns out. Try turning the one on the affected cylinder out & see if it makes a difference.....
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Post by luv2huntnd on Nov 5, 2015 19:29:39 GMT -6
I have tried this and it did not seam to help. Like I started, prior to re cleaning the carbs due to the left cylinder not firing, the right cylinder was running with the idle screw set at 2 1/2 out.
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Post by knoizy on Nov 6, 2015 1:17:01 GMT -6
...or if I cup my hand over the opening of the carb it will start firing. OK so perhaps restricting airflow is a good start. I presume you are talking about cupping the carb air inlet which means the airbox is not fitted at this point. If you are running the bike without the airbox fitted there is already too much airflow as the whole setup expects to pull air through the filters and the smaller duct, definitely worth trying with airbox fully assembled. After that gotta be a vacuum check, do you use a vacuum line for the petcock or are the vacuum ports capped?
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Post by luv2huntnd on Nov 6, 2015 6:00:38 GMT -6
I running without the air box,their is no air box foru bike. And yes my bike has the Petcock with the vacuum line running from one carb. The other carb is capped. This is how I have ran this bike since I have gone through the motor. This probl only nece present after cleaning the carbs. I have checked for vacuume leaks and can find no leaks present. Like I stated before carb was working prior to cleaning.
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Post by eaglerider on Nov 6, 2015 7:28:39 GMT -6
Trying to run the engine without air filters (no air restriction) is your problem.....these engines will much of the time, not even run without air filters, or at best, barely run.
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Post by luv2huntnd on Nov 6, 2015 19:58:08 GMT -6
Eagle, I am running the bike with pod filters. It does not matter if the filters are on or off. What the puzzling thing is that after cleaning the carbs the cylinder that was firing is no longer and the cylinder that was dead is firing.
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Post by eaglerider on Nov 6, 2015 22:57:34 GMT -6
Sounds like you still have a carb problem...possibly still some ports clogged, or more crud from the tank. Yes the petcock has screens, but the screens could be messed up and not "screening" out stuff....it is a good idea to install a simple inline fuel filter. I am trying to remember what was the cause of a similar problem with the White Knight's bike a number of years ago (one cylinder not firing at idle, but kicking in under acceleration). I think it was something electrical.
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Post by Blaine on Nov 7, 2015 6:38:27 GMT -6
I had the resistor caps on the plugs go bad on mine that caused this very problem. Misfire at idle & go away when reved.But you say yours goes away when you block the carb.
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Post by luv2huntnd on Nov 7, 2015 9:36:31 GMT -6
Correct Blaine. If I f I restrict air flow the cylinder takes off.
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Post by Blaine on Nov 7, 2015 13:48:32 GMT -6
Correct Blaine. If I f I restrict air flow the cylinder takes off. Just guessing at this point......Are sure the diaphragms are not leaking?
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Post by luv2huntnd on Nov 20, 2015 13:28:38 GMT -6
Finally solved the mystery of my dead cylinder. Pulled the carbs and cleaned them again. Once they were back on both cylinders a fired until the problem presented itself again. Again I pulled the carbs but did not really find anything that cause the problem. I then decided to look closer at the ideal jets. Even though they appeared to look clean, I found that they seamed to have build up that needed cleaning. I soaked the Jets and again cleaned them. Once back together and carbs installed the bike now starts better than it has ever started for me before.
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Post by Blaine on Nov 20, 2015 18:07:38 GMT -6
Finally solved the mystery of my dead cylinder. Pulled the carbs and cleaned them again. Once they were back on both cylinders a fired until the problem presented itself again. Again I pulled the carbs but did not really find anything that cause the problem. I then decided to look closer at the ideal jets. Even though they appeared to look clean, I found that they seamed to have build up that needed cleaning. I soaked the Jets and again cleaned them. Once back together and carbs installed the bike now starts better than it has ever started for me before. Hence my first answer......It is very easy to overlook idle jets & think they are clean.They control from idle to 1/ throttle.Glad you finally figgered it out!!
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Post by luv2huntnd on Nov 24, 2015 19:48:40 GMT -6
Your correct Blaine. When I originally cleaned the jets, they were open with no blockage this is why I dos not consider them at first. I found that there was so much hard buildup in the jet passage I needed to take a torch tip cleaning tool with a lot of force in order to clean it all out. You could say lesson learned. Just because the jets look clean does not mean that they are.
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