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Old 12-15-2005, 09:03 PM   #1 (permalink)
Supersport 400
Join Date: Oct 2005
Location: Vacaville California
Posts: 81
What the heck does this mean?

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Old 12-15-2005, 09:08 PM   #2 (permalink)
Senior Member
Formula Extreme
Join Date: Jul 2004
Location: Massachusetts
Posts: 594
Pistons rise and fall together, but fire on opposite strokes; when one's on the compression stroke the other's on the exhaust stroke.

Since four strokes equals two revolutions equals 720 degrees, firing on opposite strokes means they're 360 degrees apart.

The cruiser Triumphs have 270 degree engines. These have a split crank, the pistons don't rise and fall together and they sound like V-twins.
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Old 12-16-2005, 08:02 AM   #3 (permalink)
Supersport 400
Join Date: Oct 2005
Location: Vacaville California
Posts: 81
Thanks Joeswamp! I was wondering about that.

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