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Spark Plugs... Mechs please take a look

2766 Views 9 Replies 8 Participants Last post by  Deadman, 
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Okay so a little background first... 2014 Can Am XMR 650. It has 160 miles now... the first 100 miles were with stock exhaust and the last 60 was running the looney tuned slip on. i have attached pictures of the spark plugs to get opinions on how they look, whether they are rich or lean. I think they look a little rich but otherwise good. I am posting to ad to the big debate on whether a tune is needed for a slip-on (This of course I decided NO tune after talking in length with VForceJohn). Opinions are greatly appreciated in Advance!

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natedog24
im not a mechanic but iv been messin with pipes and tuners a bit and in my research with just a slip on you r in most cases not in need of a tuner,,BUT if u add the aftermarket air filter its almost in all cases a nessesity,,,your plugs look pretty good imo, I see a little grey at the very tip maybe indicating running a tad lean but definatly not enough to worry,,hows it running from 0 to 100% throttle,,do u notice any blips ,,let me know how u make out as I just bought a 2015 650 xmr Friday and im debating on putiing a pipe on
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Thanks for the input Nate... i am still running the stock air filter and she ran great... no stutter, no backfire, or blips and that was zero to full throttle, cruising in high and in low. I was a little hesitant but feel better now looking at the plugs.
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natedog24
ya now that youv said its running clean through the whole throttle band and seeing your plugs also I definatly think your fine,,but it doesnt hurt to get more opinions,,if u don't mind could u pm me or just give a review on your LTE,like I said,i just bought a 650 xmr 3 days ago and I looking into a pipe and have always run HMF and want something different
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LouisianaJake
natedog24 said:
ya now that youv said its running clean through the whole throttle band and seeing your plugs also I definatly think your fine,,but it doesnt hurt to get more opinions,,if u don't mind could u pm me or just give a review on your LTE,like I said,i just bought a 650 xmr 3 days ago and I looking into a pipe and have always run HMF and want something different
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I'll go ahead and give my opinion on the LTE pipe I have. I love it! I love the sounds, it has held up great and it's very easy to service unlike the HmF. Can't go wrong in my opinion.
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XMARGH
Those plugs look perfect. Not seeing any grey/whitish color which would indicate lean and they don't have any carbon build up or a heavy black coating on it to indicate a rich condition. I say your probably close to where you want to be in terms of tuning.
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Outty800rXMR
LouisianaJake said:
natedog24 said:
ya now that youv said its running clean through the whole throttle band and seeing your plugs also I definatly think your fine,,but it doesnt hurt to get more opinions,,if u don't mind could u pm me or just give a review on your LTE,like I said,i just bought a 650 xmr 3 days ago and I looking into a pipe and have always run HMF and want something different
Click to expand...

I'll go ahead and give my opinion on the LTE pipe I have. I love it! I love the sounds, it has held up great and it's very easy to service unlike the HmF. Can't go wrong in my opinion.
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I second this on the LTE love it, no issues without a fuel controller.
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awful knawful
Reading plugs is a science. And with todays fuels it makes reading them even harder. Those plugs were run at varying throttle ranges so it doesn't say much. The bike could be lean low/ mid / top , who knows. Best way is with an O2 sensor and an AFR gauge.
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awful knawful said:
Reading plugs is a science. And with todays fuels it makes reading them even harder. Those plugs were run at varying throttle ranges so it doesn't say much. The bike could be lean low/ mid / top , who knows. Best way is with an O2 sensor and an AFR gauge.
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X2. You just can't tune a fuel injected engine by spark plugs. So much change so quick that its almost useless to try tune that way.
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bigunner1 said:
awful knawful said:
Reading plugs is a science. And with todays fuels it makes reading them even harder. Those plugs were run at varying throttle ranges so it doesn't say much. The bike could be lean low/ mid / top , who knows. Best way is with an O2 sensor and an AFR gauge.
Click to expand...
X2. You just can't tune a fuel injected engine by spark plugs. So much change so quick that its almost useless to try tune that way.
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EXACTLY!
Spark plugs mean nothing in todays 4 stroke engines. You need to cut apart a spark plug to see the real story and with varying throttle conditions anything is possible.
You could be crazy lean and let it idle for 5 minutes and the plug could look rich as heck from the rich idle time.

Get an Air/fuel meter, its the only way to know.
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