1979 KZ1000st spark plug gap 0.028-0.032in

kzboy
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1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 18:02

#467763

Spark plug gap in my CLYMERS book said 0.028-0.032in. Any idea out there if I should go with the high or low number?

1979 KZ1000 ST

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otakar
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 18:05

#467765

Depending on your coils. If these are the original 32 yer old coils than go with the smaller. If they are replacement OE coils than go with the larger. If they are aftermarket hi output coils you can go .040"

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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MFolks
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 18:08

#467770

All sparkplugs wear over time, so by starting at the low end of the gap spacing, the plugs will gradually increase. Are you using the as supplied ignition coils,sparkplug wires and sparkplug caps? You ignition parts are 32 year old! Past time for replacements/upgrades.

Ignition Systems & Ignition Coils
www.msdpowersports.com/mc-3.html
www.dynaonline.com/skins/products/sportbikes/dyna_s/
www.accel-motorcycle.com/ProductDetails....on=2&minselection=19
www.jpcycles.com/product/381-326

Still got the points?

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

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kzboy
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 18:13 - 08 Aug 2011 18:13

#467772

Yeah, ignition is original and coils have cracks that I tried to repair once apon a time. I will go with the smaller of the 2 gaps as said.

1979 KZ1000 ST

Last edit: 08 Aug 2011 18:13 by kzboy.

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Motor Head
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 20:56

#467814

If your coils are cracked, you would be wise to replace them. Get some higher output coils for the bike, it will help it a fair bit. That is if your wiring is good so the voltage gets there to power them.

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...

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kzboy
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 22:44

#467865

what causes the coils to crack?

1979 KZ1000 ST

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otakar
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 23:18

#467876

kzboy wrote: what causes the coils to crack?

Heat and time. It is not uncommon on coils that old.

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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otakar
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 23:19

#467877

Motor Head wrote: If your coils are cracked, you would be wise to replace them. Get some higher output coils for the bike, it will help it a fair bit. That is if your wiring is good so the voltage gets there to power them.

100% agree

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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MFolks
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

08 Aug 2011 23:20

#467878

Even when the new, the ignition coils were marginal, put some years on them with stop and go traffic, and they will cook/overheat. Where they're mounted also traps the engine heat.

If your coils have cracks, moisture will get inside, shorting out the windings making for weak to no spark possibly stranding you.

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

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RonKZ650
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

09 Aug 2011 00:04

#467892

My ST only has 4000 miles on it and both coils have big cracks in them. It runs fine that way so I don't care to fool with them since I ride it all of 10 or 15 miles every couple years.

321,000 miles on KZ's that I can remember. Not going to see any more.

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otakar
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Re: 1979 KZ1000st spark plug gap 0.028-0.032in

09 Aug 2011 10:16

#467967

You could burn out the ignition if the coils start arcing internally.

74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000

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