Question about kawasaki Z 750 Motorcycles

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I have a 1982 KZ750 spectra, as always been a good runner, lately it will not idle under 3500 RPM, i have done various checks and do not believe it is a fuel problem. I would like help on solving this problem, suggestions etc, Thanks

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Un-carburetored air is making the fuel mix lean. Old hardened carb holders are letting in outside air. The carb holders are the fittings between the carbs and the cylinder head. Be sure the clamps holding the carbs are tight. You MAY be able to get them from Babbitt's. Sometimes they show parts as available when they arn't. If you can't find new ones, try silicone sealer on the outside of the holders. Please rate my answer.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

Posted on Sep 03, 2010

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1 Answer

Idles and runs good at low rpm. Stalls above 3500 rpm. It is a1990 115 mariner outboard( 2 stroke)


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Hi, Anonymous and the usual suspects are:
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I have a problem with the idle speed when my 1982 XJ650 heats up. When I engage the clutch, the RPMs shoot up to about 3000-3500 and even higher. When the bike is cold, the idle is perfect. Once I ride...


Hi,

Hope this doesn't reach you too late. These bikes take some time to fully warm up.

You can adjust the idle down by turning the knob between the #2 and #3 carburetors counterclockwise until you reach 1050rpm. Wear a glove or you will burn your hand!

Ride the bike some more, and see if the idle stabilizes. If not, you may have a vacuum leak somewhere.

A quick way to diagnose this is to take a propane torch (NOT LIT!) and run it around the carb boots and vacuum caps. If there is a change in rpm, then inspect the boots and caps for tightness and cracks.

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hav u disassembled the carbs and cleaned um in solvent-may be gummed up from age etc--ajusting jets can be done but takes proper values n knowhow cause to rich to lean can damage a motor

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Hey pal, this bike probably sat 4 awhile right?
If your idle jet is clogged it won't idle, the carbs need to come off, turn them upside down and remove bowl to see the jetsIf this is too much then take it to a moto mech

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