When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
General Topics/Tech TipsDiscussion on break in periods, rider comfort, seats and pad suggestions. Tech tips as they become available will be posted here.
I got my first Harley last summer 2005
XL1200C and while doing a tune up notice one plug looked rich one looked lean. I have since done a carb clean changed the oil/filter air filter plugs wires. After I rode the bike for about 1500 miles ran good but checked the plugs and again one rich and one lean. I was thinking I had either a compression (tested at 200 & 210) or intake leak so I changed all intake seals. I put fresh plugs in and rode it 150 miles and it looks better/more even but it looks like one plug is getting some oil? Glazing? I'm curious to see what you guys think? You opinions suggtions? Do they look lean with some oil on the one or is that some glazing? Any suggestions and opinions are welcome. Thanks all!
I would think the rear is running lean/hot. The blueish tint in the ring is the give away.. do you have and black speckles down in the plug on the porcelain..
Your post reminds me of the saying on here, if it ain't broke, keep working on it. Mine look like that about ever 10 K or so for the last 50K. Haven't hurt it yet.
It may be possible that your rod bearing is getting a little loose on that one. Think the piston is rubbing that insulation. I really would not worry about it, however.
Last edited by Jackie Paper; Mar 15, 2020 at 09:20 AM.
Thanks everyone for the advice and opinions. Sounds like I should not worry about it so much might be a little lean but that's about it. I do appreciate you all taking the time to comment and post similar photos.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
Hi guy! New here looking for advice.
