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Old 03-19-2003, 10:50 PM   #1
Apps
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What plug gap should you use when given a range for best spark? Does it
matter if plugs are new or just cleaning & regapping old ones? Why do they
specify a range instead of an exact gap in the first place?
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Old 03-20-2003, 12:57 AM   #2
versatileman
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Leave the plug gap stock - the plug gap has more to do with ignition system performance - not plug tip heat.

Its like this - An ignition coil can only provide so much power.
The further the plug gap - the more power (KV) required to jump the gap.
The more power needed to jump the gap - the less power available to keep the spark arcing.

Wide plug gap = coil, wire, resistor cap dammage possible (may also run poorly and have poor mileage).
Normal plug gap = good ignition performance and enough spark voltage to completely (or close) burn all the air and fuel.
Close plug gap = spark plug burns longer than normal - but produces less heat at the spark - plugs foul.

Plug heat range has to do with the length and reach of the spark plug electrode.
The more of the electrode exposed to cylinder heat, the hotter the plug will run and the more heat retained in the cylinder.
A plug with an electrode encased in alot of ceramic disipates heat easier into the plug shell than a plug that has less ceramic around electrode.
A cold plug has less ceramic around base of electrode and disipates alot of heat to the plug casing - cylinder runs cooler
A normal (for lack of a better word) plug has an average amount of ceramic - some heat is disipated - cylinder runs normal
A hot plug has less ceramic at electrode base - a little heat is disipated to the plug shell - cylinder runs hotter



Hope this helps,javascript:emoticon('&#39
smilie
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Old 03-20-2003, 01:32 AM   #3
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Versatileman That one of the best spark-plug descriptions I've seen since my primary aircraft maintance training in 1982.
Good show, All you need is the colour photos
You should move that post to important topics under Genreal Snowmobiling
:thumbsup: :thumbsup: SWRules
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Old 03-20-2003, 05:17 PM   #4
versatileman
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I have all the color photos and diagrams - but could not find a way to transfer them from my power point files - but thanks for the compliment.

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Current rides:
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Past rides:
1995 T-cat (soon to be asphalt racer)
1997 Z440
1999 ZR 600
2001 ZL 800
1996 Z440
1994 ZR700
1981 Panther 440

CR125,250, Quad sport, Buell S3T, LiVe WiRe electric FZR, 4 JS550's, JS750, Cheyenne inboard ski boat, 1996 Sea-Doo XP800, 2000 Silverado, 69 Dodge Travco, and a partridge in a pear tree
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Old 03-20-2003, 08:55 PM   #5
versatileman
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Also - I noticed an error in my description,a cold plug has MORE ceramic at the electrode - not less.
My fault for replying at 1:00a.m. with my brain half shut off.
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Current rides:
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Past rides:
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1997 Z440
1999 ZR 600
2001 ZL 800
1996 Z440
1994 ZR700
1981 Panther 440

CR125,250, Quad sport, Buell S3T, LiVe WiRe electric FZR, 4 JS550's, JS750, Cheyenne inboard ski boat, 1996 Sea-Doo XP800, 2000 Silverado, 69 Dodge Travco, and a partridge in a pear tree
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Old 03-23-2003, 10:07 AM   #6
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never seen a "range" to set the plug gap. any manual i have seen comes with an exact number...most at 28 thousands for cats :doh:
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