Idle Screw

Fontanez
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Idle Screw

11 Oct 2011 00:56

I have a '79 KZ400 H1 (just acquired it 2 weeks ago) and I have been having trouble with a loose idle screw. The vibrations of my bike loosen it up and mess with my idling. Is there anything I can do to remedy this?

Thanks!

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clutch
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Re: Idle Screw

11 Oct 2011 02:18 - 11 Oct 2011 02:27

#482504

Are you referring to the idle speed adjustment knob? If so, there should be a spring on the screw/bolt that (I believe) is what should be holding that in place.

EDIT: Looks like your setup doesn't have an idle speed adjustment like some of the bigger bikes have. What "idle screw" are you referring to?

Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...

Last edit: 11 Oct 2011 02:27 by clutch.

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Motor Head
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Re: Idle Screw

11 Oct 2011 09:39

#482527

Are you referring to #5 in this drawing?

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

KZ400Carb.gif

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Fontanez
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Re: Idle Screw

11 Oct 2011 19:16

#482593

Yes, it is located right next to the choke lever. It adjust the idle speed. Yesterday it kept loosening and today it kept getting tighter and raising my idle speed.

She's being very temperamental, especially when she's sat overnight.

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MFolks
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Re: Idle Screw

11 Oct 2011 20:05

#482602

Maybe a drop of the Blue Loctite #242 is what you need. Never use any of the Red loctites as they need about 300 F to loosen their grip. #242 is available at auto parts stores and at Wal-Mart in the auto checmical section.

1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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clutch
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Re: Idle Screw

11 Oct 2011 20:07

#482603

MFolks wrote: Maybe a drop of the Blue Loctite #242 is what you need. Never use any of the Red loctites as they need about 300 F to loosen their grip. #242 is available at auto parts stores and at Wal-Mart in the auto checmical section.

+1 from me too. I was going to suggest the same thing.

Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...

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Cuff
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Re: Idle Screw

11 Oct 2011 21:11

#482624

What I did with mine was use a hole punch to punch out a few small disks from an old tire tube, punch a hole in the middle and slide it on the screw. Kept things right where I left them.

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Patton
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Re: Idle Screw

11 Oct 2011 21:53 - 11 Oct 2011 21:55

#482634

Are parts 2, 3 and 4 present and accounted for?

Perhaps the spring has weakened?

Maybe it's the wrong spring?

Good Fortune!

1973 Z1
KZ900 LTD

Last edit: 11 Oct 2011 21:55 by Patton.

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elfmagic17
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Re: Idle Screw

12 Oct 2011 00:25

#482688

Patton wrote: Are parts 2, 3 and 4 present and accounted for?

Perhaps the spring has weakened?

Maybe it's the wrong spring?

Good Fortune!

+1 remove and check spring, may be rusted to worthlessness.

Kenny Hicks
74 Honda CB550
75 Honda CB360 (runs and rides good but not a show bike)
77 KZ650B1 (Runs Great, but needs painted and a little work.)

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martin_csr
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Re: -

12 Oct 2011 09:22 - 15 Feb 2013 11:44

#482727

.

1981 KZ650 Competition Sports and Road

Last edit: 15 Feb 2013 11:44 by martin_csr.

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Motor Head
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Re: Idle Screw

12 Oct 2011 10:23 - 12 Oct 2011 10:24

#482736

OK then #15 is the spring for the throttle adjustment, with the cable adjustment mechanism, #13, having the threaded end and the threads in the left carb body being in question. Are the threads all right, will it adjust but not hold? Maybe this spring is shot, #15.

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

KZ400.gif

Last edit: 12 Oct 2011 10:24 by Motor Head.

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