First off, They are two totally different engines. The 26cc is smaller in phyical size than the 25cc and it generates about 1000+ more rpm than the 25cc from what I have seen so far. since it's smaller in size it also weighs less than the 25cc. The 26cc seems to run a lot smoother with less vibration. Both engines seem to tune the same way but the 25cc was a whole lot easier to start. I have not yet figured out a good way to choke the 26cc and get it started quickly. Any time you can get a lighter engine with more power, thats the way to go. I'm going back out tomorrow and tweak on the 26cc to see what it will do with this new setup I have on the velocity stack. I was getting 9300 rpm at one point in my garage one evening and I'd sure like to see that again if I can get it tunned just right.
ORIGINAL: ljones5000
Zippi, I'm impressed with the way your 26 is turning out. Since you have run both, I was wondering if you would give us a comparison of the 25 and 26 in terms of performance, power, stability, etc. I have the 25 and I'm not contemplating a change, just general curiosity. The engines are virtually the same size and it seems they should be very comparable in operation.
Larry