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Motorcycle Forum / General / Yamaha / January 2008Two spark plugs - One cylinder
Two spark plugs - One cylinder I have a circa 1970 Yamaha 175 enduro motorcycle that has one cylinder, but two spark plugs. I've never had a spark plug wire on the 'other' plug and it's run just fine. Now, many many years later, I'm trying to fix this bike up for my son and I'm wondering, "What the heck is this other plug for???" I don't even think there is another wire. Thanks much for any help you can provide. Hi IMHO,one will be for gentle off road use,the other for fast road use..simply swap the plug lead to the one that suits what it's being used for. The other idea may be to run two identical plugs on a coil with 2 outputs...twin plugging the head helps with combustion etc > Two spark plugs - One cylinder > [quoted text clipped - 5 lines] > wire. > Thanks much for any help you can provide. the idea was years ago that if one plug fouled out you could just put the plug wire on the other plug and life would be good again,,,,it really didnt work that good though because the plug that wasnt fireing would usualy be fouled also,,,,,,,,,,,,,,tom the idea was years ago that if one plug fouled out you could just put the plug wire on the other plug and life would be good again,,,,it really didnt work that good though because the plug that wasnt fireing would usualy be fouled also,,,,,,,,,,,,,,tom yes indeed, I remember once needing to use the other plug and it was fouled although in those days plugs just "gave up" through use and at least the other worked, if messy. By that takes me back. Shawn (all the more reason to love 4-strokes) XT 500 > the idea was years ago that if one plug fouled out you could just put > the plug wire on the other plug and life would be good again,,,,it > really didnt work that good though because the plug that wasnt fireing > would usualy be fouled also,,,,,,,,,,,,,,tom |
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