High Idle after warm up on 81, KZ440

Mulliganov · 06-02-2005

I brought this cycle back to life after it had been abandoned for a number of years. Overhauled amost everything (or so it felt). Mostly inspecting, cleaning and general tune up stuff...

It runs pretty well but recently it has been not slowing to "normal" idle speed once it is heated up. Figured that the most likely cause would be a throttle cable that was a bit too tight... not so. Idles well when warm enough to not require choke but after a couple miles I get stares from people at stop lights.

Seems like I read something about this on this forum but can't seem to locate it now that I need the info...

Any thoughts? Seems like it should be obvious, but is itn't to me.

Thanks in advance..

oldcoldankles · 06-02-2005

Hi Mulliganov and welcome to the forum. I'm not sure about your idle problem but you might find some helpful information and links in this website covering the care and feeding of the KZ400's and 440's.
http://www.kz400.com/

elr658 · 06-02-2005

Turn the idle down?
Adjust the valves?
Clean the pilot jets.
www.kz400.com is run by a friend of mine who is the guru of all things KZ400.
Tell Ivar elr658 says HI.

QKENUF4U · 06-02-2005

more than likely a vacumn leak. you can spray carb cleaner all around the carbs/boots/etc till you find the leak. it will more than likely idle HIGHER when you hit the spot thats leaking.

Mulliganov · 06-02-2005

I'll check for the vaccum leak. Sounds like what I though I read...

About the valves. I haven't messed with them. I did a compression check as one of the first things. The pressure was in the mid range of the spec. I really haven't given them another thought...

Could the compression check be within spec and still there be a problem? I hadn't though so, but I am not sure...

thanks.

KLACKO · 06-04-2005

Another thing to check is the condition of the o-rings on the pilot mixture screws.

06-02-2005	#1 (permalink)
Mulliganov Newbie Join Date: Jun 2005 Posts: 2	High Idle after warm up on 81, KZ440 I brought this cycle back to life after it had been abandoned for a number of years. Overhauled amost everything (or so it felt). Mostly inspecting, cleaning and general tune up stuff... It runs pretty well but recently it has been not slowing to "normal" idle speed once it is heated up. Figured that the most likely cause would be a throttle cable that was a bit too tight... not so. Idles well when warm enough to not require choke but after a couple miles I get stares from people at stop lights. Seems like I read something about this on this forum but can't seem to locate it now that I need the info... Any thoughts? Seems like it should be obvious, but is itn't to me. Thanks in advance.. Last edited by Mulliganov : 08-03-2005 at 12:40 PM.

06-02-2005	#2 (permalink)
oldcoldankles KZ geezer Forum Supporter Join Date: Aug 2004 Location: Peachland, BC Posts: 535	Hi Mulliganov and welcome to the forum. I'm not sure about your idle problem but you might find some helpful information and links in this website covering the care and feeding of the KZ400's and 440's. http://www.kz400.com/ __________________ 1983 KZ550 LTD-M1 (shaft) 1981 KZ1000 CSR-M1 1989 Corvette coupe

06-02-2005	#3 (permalink)
elr658 Motorcycling's Dr. House BTK Expert Join Date: Nov 2004 Location: Seymour,CT Posts: 3,606	Turn the idle down? Adjust the valves? Clean the pilot jets. www.kz400.com is run by a friend of mine who is the guru of all things KZ400. Tell Ivar elr658 says HI. __________________ 1982 Kawasaki KZ1000R1 #658 1980 Kawasaki KZ750H1 LTD www.myspace.com/79cb750f

06-02-2005	#5 (permalink)
Mulliganov Newbie Join Date: Jun 2005 Posts: 2	About the valves... I'll check for the vaccum leak. Sounds like what I though I read... About the valves. I haven't messed with them. I did a compression check as one of the first things. The pressure was in the mid range of the spec. I really haven't given them another thought... Could the compression check be within spec and still there be a problem? I hadn't though so, but I am not sure... thanks.

06-02-2005	#4 (permalink)
QKENUF4U AZ's Official Mechanic BTK Expert Join Date: Sep 2004 Location: phoenix arizona Posts: 3,649	more than likely a vacumn leak. you can spray carb cleaner all around the carbs/boots/etc till you find the leak. it will more than likely idle HIGHER when you hit the spot thats leaking.

06-04-2005	#6 (permalink)
KLACKO Finally Got Into First Gear BTK Beginner Join Date: Aug 2004 Location: Richardson, TX Posts: 51	Another thing to check is the condition of the o-rings on the pilot mixture screws.

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