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Discussion in 'Trials' started by alpineboard, May 13, 2018.
NGK BPR7ES, with 8 hours run time, Motul 710
1 part VP16 (116 oct) Plus 4 parts 91 eth free pump gas. = 96 oct
1 part Sunoco Supreme 112 Plus 3 parts 91 eth free pump gas = 96 oct
Either mix used plug looks similar.
Plug looks way better than mine, but running junk pump gas with the spark arrestor. The arrestor just gives too much back pressure. But my bike does run gooood.
Pick one, got 8 racks of 'em...
I loved my old Italian Husky manuals, which the literal translation for spark plug from Italian was..... The stick which lights the fire!
That's a pretty good literal translation... 'candela' is spark plug in Italian. You can probably guess where the word originated (obviously it also has more than one meaning).
Is it me or does that plug, in the original post, look like it's slightly rich? I'm basing that on the color of the insulator and the spark tip, not the color of the electrode (which looks good, to me).
The photo appearance of the plug does look rich, However to get an accurate indication, It is necessary to operate at wide open throttle under load for at least 10 seconds, Then turn off the ignition, Close throttle then visually inspect the plug. The insulator around the center electrode should appear bleached white to a very Slight tan. Make adjustments in small steps, A too lean engine will transfer Metal. A slightly rich Mixture aids in cooling the engine at W.O.T..
The last time a trials motor operated at >10 seconds WOT was the last time someone detonated one after a getoff without a lanyard.
Bougie (candle) in French.
That was a clean running engine to have such a nice plug, bun 8 hours isn't much run time. I expect a plug to last years, even the life of a bike with a cleaning every few years. If it needs it