Reading my plugs
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Cruiser
Joined: Jan 2012
Posts: 164
Likes: 1
From: Lexington,Ky
Reading my plugs
Not to sure exactly how to read spark plugs so I figured I'd get some advise from people that do. Below are pics of my plugs. I've heard chocolate brown and I've heard light gray is good. Well mine look light gray but not to sure how light of a light gray they are suppose to look. This isn't a plug chop just pulled them out and took the pics after a ride today. Thanks for any help.
rear plug
front plug
rear plug
front plug
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Reading plug is an art and takes lots of practice. It is an art that is more subjective than objective. Contact SUDCO International and purchase one of their Mikuni Tuning Manuals. A lot of it works with CV's and there is a great section in the back on tuning and plug reading in general. You should also pick up a spark plug viewer so that you can properly read the plugs!! Hope this helps.
John
John
Road Warrior
Joined: Mar 2007
Posts: 1,959
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From: Florida
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Seasoned HDF Member
Joined: Dec 2010
Posts: 7,736
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From: Coromandel Peninsula New Zealand
You'd be lucky to get it so it wouldn't soot the edges and still idle. OP plugs look too lean for an Evo, an EFI TC in stock tune would look like those plugs do....and they all run too lean!
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Road Captain
Joined: Sep 2012
Posts: 675
Likes: 32
From: Massachusetts
this inspired me to check my plugs again, since the W8 is going in on wednesday (i think).
10:1 and ported heads needs a bit more fuel than I anticipated (plus I opened up the endcap on the supertrapps). definitely a bit lean. already at a 165main / 25slow in the mikuni, gonna throw a 170 / 27.5 in there for the W8 to start...although the later exhaust closing might help cool things down a bit. oil temp gauge (drilled into the filter mount) was reading almost 240*F yesterday, in 50degree temps! (that was the giveaway its time to check things)
10:1 and ported heads needs a bit more fuel than I anticipated (plus I opened up the endcap on the supertrapps). definitely a bit lean. already at a 165main / 25slow in the mikuni, gonna throw a 170 / 27.5 in there for the W8 to start...although the later exhaust closing might help cool things down a bit. oil temp gauge (drilled into the filter mount) was reading almost 240*F yesterday, in 50degree temps! (that was the giveaway its time to check things)