Spark Plugs

Colin Linz · Post by **Colin Linz** » Tue Mar 29, 2005 3:45 pm

Can anyone shed some light on how to tell what spark plugs the different square case engines use. The reference guides list two types of plugs. In NGK they are BP6HS and B6HS, the P standing for projected nose cone. In the Bosch guide they list an 860 GTS as using the B6HS equivalent, while the 900 GTS uses the BP6HS equivalent. What did Ducati change that required the different plug design? How can I be sure I’m using the correct one? How can I tell if I have a 900 or an 860 GTS?

Den · Post by **Den** » Fri Apr 15, 2005 10:35 am

If you're talking about engine capacity, they are all 864cc's.

Colin Linz · Post by **Colin Linz** » Sun Apr 17, 2005 4:57 pm

Den wrote:If you're talking about engine capacity, they are all 864cc's.

No I'm not. I want to know why they changed to a projected nose spark plug. What did they change in the engine / ignition designe that required this? How would you positively identify which plug your bike should run?

wrinklygit · Post by **wrinklygit** » Sun May 22, 2005 9:40 am

Hello again Colin,I have checked my listings which only show the pantah engine as using projected nose plugs,all bevel drive listings that I have refer to NGK B6HS or B7HS,I currently use B7HS,these equate to Champion L86 or L82 or Bosch UA7 or W4A2,MIKE

Colin Linz · Post by **Colin Linz** » Sun May 22, 2005 3:37 pm

Hi wrinklygit,

According to the Bosch application chart there are two types used. The W6BC is the projected nose cone plug. The other factor is the range of spark plug gaps, from .5mm through to .8mm. As my bike is a 900GTS I would like to know why they have recommended the W6BC, it was running W7AC (L86) plugs when I bought it, and still is. They seem to work OK, but I’m just curious as to what changed the specs.

http://apps.bosch.com.au/products/saa/s ... cycles.pdf

860 860 GT,GTS,S (D) 75- W7AC 0.5
864 900 Darmah (SS,SD) W6BC 0.8
864 900 S2 W6BC 0.8
864 900 GT,S W6BC 0.8
864 900GTS,SS,Replica W6BC 0.8
864 Mike Hailwood Replica W8AC 0.6
900 900 Monster (D) 93- XR5DC 0.9
900 900 S,SS,GTS,SD,S2,HR (D) 80- W6BC 0.6
900 Darmah 900 (D) W7AC 0.6

Vince · Post by **Vince** » Mon May 23, 2005 12:17 am

The same thing happens with Laverdas,the Germany gurus recomend
the projected tips and the rest of the world does not and there does not
seem to be a reson.

Willemd · Post by **Willemd** » Wed May 10, 2006 3:39 am

Colin,
Looking at the list of types and plugs in your message, the question also is what gap to use.
I mean, my Darmah is a 900 SD (and ofcourse 864 cc). I currently have the W7BC plugs in with a 6 mm gap and everything seems fine. Should the gap be 8 mm?

Or am I missing something?
Willem

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