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I have been working on my bike all last week and one of the last things I was doing was a carb sync. I was having problems getting them just right. The idle on my bike has always been lumpy. I purchased it used with a full exhaust and was supposedly jetting and dyno ( I have the dyno printout) by a local performance shop. It has always ran well, but had a lumpy idle and no power right off idle. Other than that it runs great...
For giggles I decided to test and see how far the air fuel screws were turned out. What I found was 3 of the 4 carbs had the screws all the way in tight!!! One carb was maybe 1.5 turns out. I set all carbs to 2.25 turns out (figured that might be a good setting with K&N filter and full pipe.) After turning those out the bike idles silky smooth. I have rode 5K+ miles like this. I can’t believe it ever idled with the screws all the way in. I have not had a chance to ride it, but the carbs synced right up with out issue, so I assume everything will run great now. How could it run with those screws tight?
For giggles I decided to test and see how far the air fuel screws were turned out. What I found was 3 of the 4 carbs had the screws all the way in tight!!! One carb was maybe 1.5 turns out. I set all carbs to 2.25 turns out (figured that might be a good setting with K&N filter and full pipe.) After turning those out the bike idles silky smooth. I have rode 5K+ miles like this. I can’t believe it ever idled with the screws all the way in. I have not had a chance to ride it, but the carbs synced right up with out issue, so I assume everything will run great now. How could it run with those screws tight?
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