kennymac131
06-16-2007, 08:45 AM
Those of use who work on our own bike and have taken our cylinder heads off probably know that on four strokes the crank turns 2x for every 1 turn of the cam.
What we may not know (and here comes my question) is if the ignition sparks on every crank revolution.
Obviously it sparks on the beginning of the power stroke (a down stroke) but what about the beginning of the intake stroke (the other down stroke)? I'm wondering if you can postiion your cam 180 out of phase with the crank?
I'm thinking the 400EX does spark on every stroke. I'm certainly no expert but I don't know of anything on the 400EX that would tell the ignition to spark on only every other crank revolution.
I haven't experimented and I can't because my bikes are in pieces right now having the heads ported.
So can anyone tell me if the 400EX sparks on every crank revolution or on every other?
Thanks
Ken
What we may not know (and here comes my question) is if the ignition sparks on every crank revolution.
Obviously it sparks on the beginning of the power stroke (a down stroke) but what about the beginning of the intake stroke (the other down stroke)? I'm wondering if you can postiion your cam 180 out of phase with the crank?
I'm thinking the 400EX does spark on every stroke. I'm certainly no expert but I don't know of anything on the 400EX that would tell the ignition to spark on only every other crank revolution.
I haven't experimented and I can't because my bikes are in pieces right now having the heads ported.
So can anyone tell me if the 400EX sparks on every crank revolution or on every other?
Thanks
Ken