Won't return to idle between shifts

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20 Apr 2008 07:50 #207801 by jafilson
Won't return to idle between shifts was created by jafilson
Okay..got it back together and no more vac leaks around the boots! I just put a thin coat of permatex on them. Temp fix..it idles real nice now so I put enough stuff back on the bike to take a ride around the block.
Everything seems pretty cool, but when shifting between gears, it does not idle down, so when you shift, the engine revs up when you pull in the clutch just enough to be weird.
It does idle down, but it takes too long.What could this be? nothing is hanging up like throttle cable etc. It just seems slow to idle back down? I don't know. Any thoughts would be appreciated. Thanks guys...Jeff

1981 KZ650H1 MFG 1/81 9966 Miles
Keihin vacuum piston carbs. 4 in 1 exhaust.
Pekin, IL

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20 Apr 2008 08:07 #207806 by twinkyrider
Replied by twinkyrider on topic Won't return to idle between shifts
I'm thinking one of two things, did you at least bench sync the carbs(one or two carbs open too far at idle position can cause a fast idle hangup)? And(or) if the idle mixture screws are out too far, that may also cause a fast idle hangup.

78 kz1000A
Fond du Lac,WI

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20 Apr 2008 10:50 #207829 by Beatpoet
Replied by Beatpoet on topic Won't return to idle between shifts
Slow idle return = too lean?

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20 Apr 2008 12:41 #207849 by mark1122
Replied by mark1122 on topic Won't return to idle between shifts
look inside carbs to verify that the cable is indeed not sticking .the slides should return to bottom when not running.if they are u likely have a lean issue.
did u check for an air leak by wd40 or the like all around the boots and vac lines?

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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~ (k) / (z)

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20 Apr 2008 16:34 - 20 Apr 2008 16:42 #207889 by onanysunday
Replied by onanysunday on topic Won't return to idle between shifts
Try lubricating both throttle cables with a chain lube until it drips out the end of the cables and also properly adjust the throttle stop screw adjuster in the carb rack (if equipped) Also be sure to generously lubricate the throttle tube (underneath the right handgrip and in between the metal handlebar. With all these parts lubed up you should be good to go. Also, check for proper tightness on the both the push and pull throttle cables. They should both be adjusted so they smoothly snap back to idle speed with a minimal "loose" feel. Everything should feel relatively tight, Good luck!

I just did this today on my bike because the throttle action was stiff and the throttle grip would never snap back to idling. This worked for me. Just remember, there are many opportunities for this too happen because there may be two or more "adjusters" on the throttle cables, as well as other possible problems metioned here. Even if you thought the cables are properly lubed, go ahead and lube them again anyway. It won't make the throttle response any slower, but it may allow the 'snap back' to idle speed happen that much quicker. Also make sure you adjust the idle screw to 900 rpm's for 900cc engine and 1000 rpm's for 1000cc engine.

79 KZ1000 E-1
VM28SS
K&N Pods
Last edit: 20 Apr 2008 16:42 by onanysunday.

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21 Apr 2008 06:45 #207971 by wiredgeorge
Replied by wiredgeorge on topic Won't return to idle between shifts
What type of carburetors are being asked about. It does make a difference in the answer I guess.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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22 Apr 2008 05:14 #208160 by jafilson
Replied by jafilson on topic Won't return to idle between shifts
Hey guys thanks for all the help!
I just read through the suggestions made. I have had the throttle grip off,put a drag bar on it. no hang ups there.
lubed the cable until it drips out the other end. It only has the one cable,not the push pull style. I have leak checked the boots with carb cleaner and had a leak, but took care of that before I posted this problem. Syncro. sound like a good poss. or idle mixture. I got to get off here for now but will be back soon!

1981 KZ650H1 MFG 1/81 9966 Miles
Keihin vacuum piston carbs. 4 in 1 exhaust.
Pekin, IL

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22 Apr 2008 09:09 #208206 by jafilson
Replied by jafilson on topic Won't return to idle between shifts
Keihin carbs...vacuum slides...single cable...would like to know what the carbs are for sure. I will get some pics,maybe even today yet. Thanks Again!
Jeff

1981 KZ650H1 MFG 1/81 9966 Miles
Keihin vacuum piston carbs. 4 in 1 exhaust.
Pekin, IL

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22 Apr 2008 10:36 #208236 by wiredgeorge
Replied by wiredgeorge on topic Won't return to idle between shifts
Go into your profile and edit your signature to reflect your location, bike model and year and it will make solving tech issues a lot simpler. Good luck.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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23 Apr 2008 20:22 #208599 by jafilson
Replied by jafilson on topic Won't return to idle between shifts
I just noticed on the classifieds here, my carbs are the Kiehin cv34's at least that is exaclty what they look like.

1981 KZ650H1 MFG 1/81 9966 Miles
Keihin vacuum piston carbs. 4 in 1 exhaust.
Pekin, IL

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24 Apr 2008 12:36 #208764 by Beatpoet
Replied by Beatpoet on topic Won't return to idle between shifts
Did you change the cable when you put the shorter bars on?

Any progress on this?

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24 Apr 2008 14:35 #208800 by jafilson
Replied by jafilson on topic Won't return to idle between shifts
Not resolved yet, but haven't had much time either.
No I did not replace the cable, it was fine so I am using it for now.You can see the linkage for the carbs snap back to normal position quickly, so it is not a cable issue.
It is just a bit long, but I will buy a new one later on.
Thanks!
I left pictures in the gallery today!

1981 KZ650H1 MFG 1/81 9966 Miles
Keihin vacuum piston carbs. 4 in 1 exhaust.
Pekin, IL

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