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So this spring when I started my bike it only ran on one cylinder. I have a 2006 Vstar 1100, with slip-on pipes, carb is jetted. I took off the gas tank and airbox, I could see gas backing up in the front intake boot. I pulled the carbs off and took the float bowls off. I believe they make the float bowl screws out of the softest metal known to man. When I opened them up, they looked as clean as new. Soaked them, blew them out, put them back together. Ran the same. So I took it into the dealer. They rebuilt the carbs, and called me up to come pick it up. At idle it ran fine, but it sounded "different" if you know what I mean. I started down the road and it ran like complete crap. A lot of hesitation, and struggling through the mids and high rpms. I turned right around and brought it back. They called and said when they sprayed cleaner on the intake boots, the idle dropped so the boots must be bad. Ordered new intake boots and installed. 550 dollars later, they called and said it was ready. I get on it and drive it home, it is somewhat better, but nowhere near running good. Still hesitating and seems to be starving for fuel. Doesn't sound right. They said they put over 10 hours trying to get the carbs adjusted right. I can't believe they would let it go out the door running like this. I would rather keep it home and try to fix it myself now. The mechanic told me because of the slip-on pipes that it would be hard to get it dialed in perfect. Well, it ran perfect last summer. Any ideas? I'm going to start with intake boots to see if they are tight.
 

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So this spring when I started my bike it only ran on one cylinder. I have a 2006 Vstar 1100, with slip-on pipes, carb is jetted. I took off the gas tank and airbox, I could see gas backing up in the front intake boot. I pulled the carbs off and took the float bowls off. I believe they make the float bowl screws out of the softest metal known to man. When I opened them up, they looked as clean as new. Soaked them, blew them out, put them back together. Ran the same. So I took it into the dealer. They rebuilt the carbs, and called me up to come pick it up. At idle it ran fine, but it sounded "different" if you know what I mean. I started down the road and it ran like complete crap. A lot of hesitation, and struggling through the mids and high rpms. I turned right around and brought it back. They called and said when they sprayed cleaner on the intake boots, the idle dropped so the boots must be bad. Ordered new intake boots and installed. 550 dollars later, they called and said it was ready. I get on it and drive it home, it is somewhat better, but nowhere near running good. Still hesitating and seems to be starving for fuel. Doesn't sound right. They said they put over 10 hours trying to get the carbs adjusted right. I can't believe they would let it go out the door running like this. I would rather keep it home and try to fix it myself now. The mechanic told me because of the slip-on pipes that it would be hard to get it dialed in perfect. Well, it ran perfect last summer. Any ideas? I'm going to start with intake boots to see if they are tight.
Check/replace the vacuum caps. I learned that one the hard way... No way you'll be anything but lean if those are leaky.
 

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Check/replace the vacuum caps. I learned that one the hard way... No way you'll be anything but lean if those are leaky.
Are they the caps covering the holes used to sync the carb?
 

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I would have a sit down with the dealership owner and politely ask for some, if not all, of your money back. If they cannot get the carbs adjusted correctly it's because the person holding the carb doesn't know what to do with it and he is blaming your mufflers for his lack of knowledge. If I don't know what I'm doing I tell a customer and refund his money if I don't solve his problem. There is no shame in admitting you don't know. Can't say the same for someone that blames other parts and still takes someone's money
 

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Discussion Starter #7
Thanks, I see where they are. I'll take a look tomorrow when its not 90 degrees outside and let you know what I find.
 

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IF it turns out that the caps are a problem, I'd surely go give your dealer hell about that. In my book new caps should have been part of a carb rebuild, and definitely should have been something they checked.

On the one hand, I hope it IS that, 'cuz it's cheap and simple. OTOH, I wouldn't bet on it: the dealer really SHOULD have replaced them and/or checked that already.
 

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Wow...if they took 10 hours and still couldn't figure out how to properly tune V Star 1100 carbs (simple Mikunis).....I'd definitely talk to the service manager. If it takes a tech that long to fix Mikuni carbs, he's in the wrong business.
 
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