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1 spark 2 spark rev 2 rev...

S

s2sailorlis

Member
...not a Dr Seuess quote..but...

I acquired a Hardline tach/hour meter, and own a 1994ish M5B 5 HP 2 stroke cylinder.

Does anyone know if this engine fires:

a) 1 spark per revolution
b) 1 spark per 2 revolutions
c) 2 sparks per 1 revoution (wasted spark?)

Also, regarding compression testing - if one did a compression test on a "cold" engine vs one that was brought up to operating temperature, would the compression read the same or would it be lower or higher, i am thinking lower...

Thanks in advance!
 
a) Once per revolution. Fires each TDC; On a TWO cylinder, it would be 2 per revolution.

Might be a hair lower cold, but not much.
 
Perfect, thanks Paul. After changing the setting it seems my idle was a bit too high...like 1400 rpm or so..after the pilot screw and throttle cable adjustment it idles and shift much more smoothly.....
 
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