EN500 slow return to idle (decel) - Kawasaki Vulcan Forum : Vulcan Forums
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Old 01-03-2013, 09:38 PM   #1
fbnewell
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Default EN500 slow return to idle (decel)

Don't have another to compare to. Before and after cleaning carbs on new-to-me '07 EN500 w/ 1,300 miles, engine is slow to decelerate after hitting the throttle. Could take as much as three seconds to return to idle from 1/4 throttle. Normal? My Shadow 1100 is not like that. Pops just a tad during decel, also. Observing this both in shop and on the road.
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Old 01-03-2013, 11:03 PM   #2
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Quote:
Originally Posted by fbnewell View Post
Don't have another to compare to. Before and after cleaning carbs on new-to-me '07 EN500 w/ 1,300 miles, engine is slow to decelerate after hitting the throttle. Could take as much as three seconds to return to idle from 1/4 throttle. Normal? My Shadow 1100 is not like that. Pops just a tad during decel, also. Observing this both in shop and on the road.
Your running lean.You need to adjust you idle mixture screws.
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Old 01-03-2013, 11:17 PM   #3
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Thanks. I'll give it a go tomorrow.
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'07 Kawasaki Vulcan 500 (hers)
JT 17-tooth front sprocket
Harley Dyna mufflers [64941-07]
Biker's Friend medium round bag
sissy bar / luggage rack [brand unknown]
'97 Honda Shadow 1100 Spirit (his)
Biker's Friend large round bag
shop-made luggage rack w/ 1.7-gal aux. fuel tank
Kuryakyn grips
VistaCruise
Memphis Shades ruby Hellcat windshield
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Old 01-04-2013, 05:10 AM   #4
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Check the throttle cables for binding.
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Old 01-04-2013, 06:45 AM   #5
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Im having the same issue on my 96' en500, let me know if you figure out what was causing it for certain
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Old 01-04-2013, 07:25 AM   #6
Phil in Maine
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A hanging idle is very often a result of an intake leak. I would make sure the carbs are seated well against the intake and also against the air box.

Also did you sync the carbs? Im not sure if your cleaning included fully taking them apart or not.
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Old 01-04-2013, 08:03 AM   #7
fbnewell
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I took them apart, and a few days later had a moto mechanic take them apart. He pulled the choke sliders out and cleaned them up, as well. He still has bike. Yesterday I went to his shop as he tested it. Butterflies are snapping closed at release of throttle. Carbs have been synced (ran it on gauges while I was there). I'm going down there in about two hours from now, just wanted to get some more ideas.

Thank in advance.
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'07 Kawasaki Vulcan 500 (hers)
JT 17-tooth front sprocket
Harley Dyna mufflers [64941-07]
Biker's Friend medium round bag
sissy bar / luggage rack [brand unknown]
'97 Honda Shadow 1100 Spirit (his)
Biker's Friend large round bag
shop-made luggage rack w/ 1.7-gal aux. fuel tank
Kuryakyn grips
VistaCruise
Memphis Shades ruby Hellcat windshield
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Old 01-04-2013, 12:30 PM   #8
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Picked it up a few minutes ago. Mechanic did richen the idle circuit up a bit. Runs great now. No extended decel, either. Now, just need it to warm up a bit so my wife can actually ride her bike. It was 46*, north wind at about 15 mph, and misting rain when I rode it the 15 or so miles home - she won't ride in ANYTHING like that kind of weather!!!!!
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"If you choose not to decide, you still have made a choice!"
'07 Kawasaki Vulcan 500 (hers)
JT 17-tooth front sprocket
Harley Dyna mufflers [64941-07]
Biker's Friend medium round bag
sissy bar / luggage rack [brand unknown]
'97 Honda Shadow 1100 Spirit (his)
Biker's Friend large round bag
shop-made luggage rack w/ 1.7-gal aux. fuel tank
Kuryakyn grips
VistaCruise
Memphis Shades ruby Hellcat windshield
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Old 01-04-2013, 03:02 PM   #9
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Quote:
Originally Posted by fbnewell View Post
Picked it up a few minutes ago. Mechanic did richen the idle circuit up a bit. Runs great now. No extended decel, either. Now, just need it to warm up a bit so my wife can actually ride her bike. It was 46*, north wind at about 15 mph, and misting rain when I rode it the 15 or so miles home - she won't ride in ANYTHING like that kind of weather!!!!!
A lot of times the idle mixture screws are set to 2 1/2 turns & left.(too lean)Each bike is different & they need to be adjusted with the bike warmed up & running.
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