thats the thing, im not sure which engine im going to put it on.  I have a stihl 25.4cc, a ryobi, and might be getting a poulan 25cc.  I was just wanting to know if an ignition made or used on one type of engine was swappable with another.  There is a 80% chance it will make its way to the stihl, but I might go gas/glow.  This ignition is alot cheaper than buying one online, cause its in Canada, and it wont have to be shipped.