Read these plugs?
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,625
Likes: 6,443
From: Honah Lee
Natural light
Natural light and more pix. You can tell the difference between front and rear cylinder. Bike starts and runs great through all ranges weather hot or cold, 35-100 degree outside temperature. Slight exhaust babble when coming off throttle. Backfires (pops) one time once in a while on start. Some may think that is a ceramic glaze but actually I think its just a deposit from fuel and oil. It scrapes off easily. Nathan if yours scrapes off easily with a slight swipe with a screwdriver its not hot glaze like some are saying. Your electron microscope picture is misleading I believe. My bike supposedly was mapped by dealer for open python exhaust that was on bike when I got it. It has new takeoff 96ci nightrain factories on it now..... Nathan inswva how did you attach your two pictures in your fp?? Are they a signature?
Last edited by Jackie Paper; Oct 22, 2010 at 10:10 AM.
Banned
Joined: Sep 2009
Posts: 7,580
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From: The Internet (& Dyer, Indiana)
Banned
Joined: Sep 2009
Posts: 7,580
Likes: 7
From: The Internet (& Dyer, Indiana)
9k miles on those plugs? Don't change a thing. Leave it alone.
Your plugs DO look slightly lean , but the more telling part is that you said you get "pops" on deceleration . That is a definate sign of running a bit lean . As some other have said , I would say one size up on your jet .
Pops out the pipe mean rich, (during acceleration).
During decel, don't mean much, considering pipes have such a huge effect on decel pop. Unburnt fuel igniting in the pipe. You can tune it out by making some adjustments in 0% throttle position (if you have a tuning device on the bike). But actions during decel have little to do with how the bike runs during accel.
This is an EFI bike, right?
Road Master
Joined: Apr 2008
Posts: 1,001
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From: Pirmasens Germany
Road Warrior
Joined: May 2009
Posts: 1,945
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From: Victoria, Australia
I wouldn't be concerned-- as others have said may be a tad lean. You really should have chopped the ignition at speed after a steady run then removed them for a look.
Plugs that look grey-ish white are generally considered good to go these days.
Plugs that look grey-ish white are generally considered good to go these days.
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Joined: May 2009
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From: Victoria, Australia
Natural light and more pix. You can tell the difference between front and rear cylinder. Bike starts and runs great through all ranges weather hot or cold, 35-100 degree outside temperature. Slight exhaust babble when coming off throttle. Backfires (pops) one time once in a while on start. Some may think that is a ceramic glaze but actually I think its just a deposit from fuel and oil. It scrapes off easily. Nathan if yours scrapes off easily with a slight swipe with a screwdriver its not hot glaze like some are saying. Your electron microscope picture is misleading I believe. My bike supposedly was mapped by dealer for open python exhaust that was on bike when I got it. It has new takeoff 96ci nightrain factories on it now..... Nathan inswva how did you attach your two pictures in your fp?? Are they a signature?
An exhaust "babble" is not necessarily decel pop. I had a early pair of SE slip ons that made a babbling sound on decel and the 2 sounds are totally different.
Looking at the plug pics did you clean the right plug in the pic? If not the left plug is just a leeeetle bit lean.
Nothing to worry about in my opinion.