What type of plugs should I use? - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 8 (permalink) Old 10-02-2010, 09:58 PM Thread Starter
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What type of plugs should I use?

Alrighty, what type of plugs should I use in my mach z? Right now I've got ngk 8's on the clutch side and center, and the last cylinder is a 9. This is how I bought it, so I'm wondering if I should just keep it this way or what? Ngk.com recommends I run 10's in all my cylinders but I've heard most people use 8's or 9's. Any help would be appreciated! Thanks

Current Sleds-
95' ski doo Mach z 780 triple (stock)
98' ski doo formula sl 500 (Stock)
98' Arctic cat 440 Jag (studded)

Previous Sleds-
00' Mxz 700
1992 Ski doo Mach 1 (DG pipe)
1976 El Tigre 5000
1972 Arctic Cat Panther 440

"Ride em' till you can't feel your toes"
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post #2 of 8 (permalink) Old 10-03-2010, 07:16 AM
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I run iridium 10's in my mach z.They work great.
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post #3 of 8 (permalink) Old 10-03-2010, 08:52 AM Thread Starter
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Hmmm thats interesting. So do you think 8 is too hot of a plug? I'll pop em' out today and see what color they are.

Current Sleds-
95' ski doo Mach z 780 triple (stock)
98' ski doo formula sl 500 (Stock)
98' Arctic cat 440 Jag (studded)

Previous Sleds-
00' Mxz 700
1992 Ski doo Mach 1 (DG pipe)
1976 El Tigre 5000
1972 Arctic Cat Panther 440

"Ride em' till you can't feel your toes"
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post #4 of 8 (permalink) Old 10-03-2010, 02:51 PM
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Someone who was too lazy to correct jetting or another problem (too rich) did that.
There is no reason to be using the wrong heat range plug and certainly none for using two different ranges in an engine.

Put the 10's in and run it at the correct operating temp and check plug color and piston wash.

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w/ Comet 108 Pro-4 clutch & 01 ZR skid

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post #5 of 8 (permalink) Old 10-03-2010, 05:36 PM Thread Starter
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If my sled is running too rich, I believe I would need to get a cooler plug. So yeah, 10s would be a good idea thanks. I pulled my plugs out and they do look pretty oily. Thanks for the help!

Current Sleds-
95' ski doo Mach z 780 triple (stock)
98' ski doo formula sl 500 (Stock)
98' Arctic cat 440 Jag (studded)

Previous Sleds-
00' Mxz 700
1992 Ski doo Mach 1 (DG pipe)
1976 El Tigre 5000
1972 Arctic Cat Panther 440

"Ride em' till you can't feel your toes"
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post #6 of 8 (permalink) Old 10-03-2010, 06:38 PM
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I run Br9EIX plugs in my Z's. The 9's are a good temp, 8's are a little hot.

1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
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2006 Ski Doo MXZ 500SS
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post #7 of 8 (permalink) Old 10-03-2010, 06:51 PM Thread Starter
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Yeah I just put the spare br9es' I had from my sl in the mach today, and it seems to run better. So should I just stick with the es' or should go with the eix? Is it just a better quality plug? I've used br9es' in all my sleds and they've worked great for me!

Current Sleds-
95' ski doo Mach z 780 triple (stock)
98' ski doo formula sl 500 (Stock)
98' Arctic cat 440 Jag (studded)

Previous Sleds-
00' Mxz 700
1992 Ski doo Mach 1 (DG pipe)
1976 El Tigre 5000
1972 Arctic Cat Panther 440

"Ride em' till you can't feel your toes"
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post #8 of 8 (permalink) Old 10-03-2010, 08:36 PM
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I put 1 set of iridium plugs last year.Never blew any.I'm hooked.
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