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June 7th, 2015, 02:44 PM   #1
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FE570 - Spark every revolution??

Can someone please let me know if the 570 sparks every revolution or every other revolution?

Trying to sort out the tach pickup for the Vapor.

Many tks.

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June 7th, 2015, 08:11 PM   #2
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Four stroke every other Revolution. Two stroke every revolution. Your FE570 is a four stroke. Please let Us know how you like Vapor after you set it up.

Last edited by Rainerio; June 7th, 2015 at 08:45 PM.
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June 7th, 2015, 09:06 PM   #3
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the pulse coil is fitted to the crank so it sparks every revolution

"lost spark setup"

for it to only spark every second revolution there has to be a position sensor on the camshaft

try another tach that is known to work and see what it says.. there may be some noise in the system confusing the tach unit
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June 8th, 2015, 08:55 AM   #4
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The FE570 idles at about 900 - 1200 rpm when you set it that should tell you with way is right. I'm wrong ? Normal 4 stroke engine every other revulsion.
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June 8th, 2015, 09:08 AM   #5
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That's a quite low idle! Manual states about 1600RPM in 2009 and goes to 1800-1900 for the 2012 models ... or thereabouts! iirc!
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June 8th, 2015, 12:28 PM   #6
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As far as I know most modern single cylinder bikes have a "spare spark" setup.

And then....I might be totally wrong....

M.
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June 8th, 2015, 12:37 PM   #7
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Originally Posted by Rainerio View Post
The FE570 idles at about 900 - 1200 rpm when you set it that should tell you with way is right. I'm wrong ? Normal 4 stroke engine every other revulsion.
You're not wrong about how four-strokes work, however it is simpler mechanically/electronically to have the sparkplug spark every revolution. It doesn't do anything but spark in a cylinder that is evacuating exhaust gasses however.
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June 8th, 2015, 10:58 PM   #8
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Originally Posted by basalt View Post
You're not wrong about how four-strokes work, however it is simpler mechanically/electronically to have the sparkplug spark every revolution. It doesn't do anything but spark in a cylinder that is evacuating exhaust gasses however.
FWIW

I question this?? On exhaust there can be a after-burn as not all gases burn off during the first fire. The Dodge hemi is one example on two plugs per cylinder that fire in different time to create a pre and after burn. What would the result be if the exhaust gases ignited on the exhaust stroke? The other question of double fire would make me curious about wear on the electrode, Premature spark plug gap failure?

I would be curious to see a modern four stroke engine fire twice as I have only ever have seen a single fire during one complete four stoke cycle. I think all kinds of issues could happen as electronics map the spark fire to ensure no misfire as well a ton of other things such as revolutions per min. Cam, Crank and other sensors take note and send the signal to fire at only at the time it is required.

I however am not sure on this specific model but would think a cam sensor of some sort only allows it to fire once no matter what the crank does.
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June 9th, 2015, 05:40 AM   #9
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Originally Posted by FE350 View Post
I would be curious to see a modern four stroke engine fire twice
To answer it with a question: What sensor in a Husaberg motor allows the engine to only fire on the compression cycle?

(Just to be clear: There is none!)

Last edited by tourist; June 9th, 2015 at 07:29 AM.
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June 9th, 2015, 07:03 AM   #10
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Sparks at TDC of exhaust stroke so cylinder is nearly empty of uncompressed exhaust. Not much left to happen. Not the same situation as the hemi.
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