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You're right I guess. I'll take a spin out to the Slimey Crud today and see if I can get a picture to post.
Here's what the plugs looked like when I got back from Pine Bluff:They look similar to n330j's V11I would switch the descriptions for "lean" and "optimal" on RinkRat's photo.I was hoping for a brazilian tan on the plugs, but have essentially a holstein heifer, if you know what I mean.On the other hand, maybe I am looking for problems where there aren't any, and I should just relax, eh?
Easy............... .... Paul B
Wait... Aren't the plugs for Lean and Optimal mixed up?
Nothing gets by us, eh?Was that a test?
IMO, it is always interesting to see where your brain goes first with limited information. No doubt due to the past experience of the individual.Since I have no background information, when I hear pinging engine, my brain goes to fuel with too low an octane rating, before it goes to ignition timing that is too advanced.Growing up in very rainy Upstate NY, engine misfiring or sputtering? My brain goes to water in the gas first. More than a couple of road trip have been saved by finding an auto parts store and dumping some dry gas into the tank.Now that ignition systems are orders of magnitude better than they were in the 60's and 70's, it is easy to start thinking that the carb jetting needs changing when when the spark plugs looks too dark.The following post from someone much smarter than me, a long time ago, in a galaxy far, far, away.... got me thinking about hotter than stock spark plugs. I'm glad I read it. I've been running hotter than stock plugs in a few engines ever since. I run CR7 plugs in the DR. Today’s Dyno Project bike. Suzuki DR 650. Dead stock, 700 total miles. semi late model Suzuki DR 650 thing. Bad hesitation in lower RPMs but EGA says mixture is good, not perfect but completely safe, well on the rich side. Air cooled old farm implement engines like rich mixtures too. Guzzi Content -EdEngines pulls to redline well though. Clears its throat at about 5500 rpm and runs to the limiter up top.Odd yes. Remove spark plugs. Cross ND number with NGK number, since I actually know NGK coding very well.10 heat range? That is a race cold plug...only really used in roadracing two strokes and some very hot high performance 4 cylinder bikes that see stupid rpm.Installed a set of 8 range plugs, much hotter, much better for an air cooled, puss camshafted, low compression , low rpm somewhat rich running single cylinder engine...especially with dual C size 10mm spark plugs.All better. The 10's were just staying too cold on the insulator at low rpms to self clean at all! I sent the bike back home with the guy. $5.41 cents to solve a problem plaguing the bike from new. The 10's stayed clean enough to run when they got smoking hot at higher rpms...but wide open at low rpm, not a chance. This made a 1 bhp gain everywhere ironically.The dyno chart showed an effectively a 10 bhp gain in the zone where trouble was bad and 1 bhp up top. I was proud of this diagnosis...about 15 minutes start to finish...sweet!The truly proper heat range for this bike and the owner's riding style is a 6...maybe a 7 if he rides more aggressively than he says he does. Says it is strictly a put around town real slow sort of bike?
I think those images are all plugs run on leaded gasoline.
Accurate plug reading is done on new plugs... Even if running leaded race fuel there will be a whitish insulator unless the the engine is run for a hundered miles.... Plugs from my 650 Triumph land speed racer after several run wide open down the 1-1/2 mile track using VP leaded race fuel..The plug show a very slight rich mixture. The mixture color is deep down on the insulator, threaded section my need to be cut away to have a look...I use an Octoscope.... Race bike plug My 61 650 A10 BSA running a mixture of non ethanol pump gas and leaded race fuel..About 25 miles of fast riding onback roads 79 Triumph 750 , non ethanol unleaded pump gas...
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Thats some interesting information. My 02 Stone that I have fought with to get it running right since the day I got it has progressed to a point that its almost right.. Still feels a little lean at just above idle, [about 30-35 in 3rd gear.] but the plugs show rich.. I used to play with plugs 100 years ago in my drag racing days, but it totally slipped my mind on this bike. Maybe Ill try jumping up a heat range or two, and seeing how it likes it.
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