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Old 08-04-2008, 08:46 PM   #1
adub
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Bike Runs Rough

Picked up an 03 Vstar 650 with 9500 miles on it for my wife the other day. I know nothing about bikes, but I work on cars constantly. The previous owner had kept up with fluids, but it was time for new plugs, fuel filter, and air filter. Bike has plenty of fuel and has been driven regularly. Drove fine when we brought it home 2 days ago. Replaced plugs and fuel filter and now the bike runs like . It idles low and rough and is down on power when you drive. I put the stock fuel filter and plugs back in and its still runs rough. What did I screw up?
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Old 08-04-2008, 08:52 PM   #2
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petcock clogged? battery charged? plug wires pulled loose?
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Old 08-04-2008, 09:18 PM   #3
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Sounds like a vacuum leak; everything connected?


make sure that fuel filter is full of fuel; otherwise you're pumpin air through the rail...(shouldn't take too long for it to fill up.)
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Old 08-04-2008, 10:10 PM   #4
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The V Star 650 is a carbed bike so there is no "rail".

As stated before, check for vacuum leaks, also, make sure the wires are tight at the plug caps and that the plug caps are all the way on the plug.
Double check the plugs and make sure they're correct and are gapped properly.

Also at 9500 miles it is well due for a vave adjustment. Do you know when the last one was done?
The V Star 650 calls for the valves to be adjusted every 4000 miles.

If you don't get it figured out, bring it by and I'll give it a listen.
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Old 08-04-2008, 10:19 PM   #5
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to the best of my knowledge, valves have never been done. I doubt thats the problem. They wouldnt just go out of spec like this.

I'll check for vacuum leaks, but I haven't touched any vacuum lines.
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Old 08-04-2008, 10:22 PM   #6
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You misunderstand me. I didn't say the valves were causing your issues, merely that they're due for adjustment, and the air cooled 650's are notorious for the exhaust vaves getting tight.

Look at the plugs / wires etc., that's probably where the problem is.
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Old 08-04-2008, 10:28 PM   #7
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Carb

I am a service advisor for Pasadena Honda and I see this problem every day. It doesn't matter how often you ride it, its about how long it takes you to use up a tank of gas. The Ethonol in the gas goes stale in a week to two weeks and the vapors will slowly clog up the jets in your carb. Yes it could also be vacuum leaks but we see more carb problems than anything. Does it have aftermarket exhaust? If so; was it rejetted? Try pullng out the choke. if the bike runs better with the choke out then its a clear sign that the carb is clogged.
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Old 08-04-2008, 10:34 PM   #8
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Bogging Down

When you twist the throttle quickly while ridding it. Does it bogg down and then speed up? if so then this is a clear sign again that it is the carb.
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Old 08-05-2008, 08:10 AM   #9
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Yes it runs better with the choke out, yes it boggs when she tries to accelerate.

Bike is 100% stock

Best way to clean out the carb?

Ballpark, whats it cost to have the valves adjusted?
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Old 08-05-2008, 08:21 AM   #10
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Since I swapped the fuel filter, is it more likely I sent some crud into the lines that caused the jets to clog rather than damage due to ethanol?

Thanks for all the help
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Old 08-05-2008, 01:03 PM   #11
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Messed with it some more. The fuel filter is filling up completely, no air in the lines. I let it idle and run for 15 min or so and the problem got noticeably better. It idles smoother, but still not right. Especially at light throttle. Can't really go out and run it in the rain.
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