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Originally Posted by JoeJoe
PS- I was also told checking my spark plugs was no longer an accurate way to check if I am running lean. I was told the reason was because of all the fuel additives today. Most bikes run a lighter spark plug to begin with. Anyone else heard this before? Thanks! JoeJoe
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George at Dobeck Performance, Trent at Thunder, the service manager at Blockers (a large PA dealership), and other "experts" have told me that due to detergents and additives in gasoline today, plugs look leaner than they actually are. But plug color was how us "old guys" used to check air/fuel mixture on 4 cycle bikes.
After I had my 2000 Nad dyno tuned last summer (at 14:1), I pulled the plugs and they looked way too lean-- but I can't really argue with the O2 results. So that seemed to confirm what I'd heard about detergents, etc. As a result and to put this issue to rest for me, I ordered and today installed an NGK O2 monitor and will have the sensor welded-in when the weather improves (enough to ride up to Peekskill). This little baby reads a/f ratios to the hundredths, from 9 to 16:1.
I’ve also ordered a handlebar mount for the monitor from JC Whitney, but in the meantime, black duct tape will have to do (see pic). The wiring harness is 13' long, so I had to cut, solder and wrap. When I get results, I’ll post. (BTW: My TFI settings now are 3, 5, 4 and 9 and the plugs’ ceramic insulators are light grayish-amber.) To be continued….