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Posted by Fargen Bastage on October 23, 2007, 9:31 pm
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.
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Posted by Mark Smith on October 24, 2007, 4:41 pm
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
>
> 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.
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Posted by THOMAS KRISE on November 3, 2007, 3:30 pm
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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Posted by THOMAS KRISE on November 3, 2007, 3:30 pm
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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Posted by Shawn Ket on January 1, 2008, 7:39 am
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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