Ok, before I begin, I am a BIG fan of Saito engines!! Love them. I've been flying with both the Saito 82 and 100 and love them. I recently purchased a 125 to go on my Segull Extra 260 90 size. I had the 100 on it and it flew fairly good considering the plane weighs 9lbs. I put the 125 on the same plane and didn't notice any increase in power or performance over the 100!!

I was running a 15X6 apc on the 100 and getting 9,600 peak rpm with 30% nitro. Not too bad. The 125 on the other hand has the 16X6 apc and only spinning 8,800 peak rpm. This seems low. My first thoughts were, wow, I bet the 100 could spin the same 16X6 at that rate so I tried it. Believe it or not, the 100 spins the same 16X6 apc, using the same fuel at 8800-8900 rpms!! This means that the 100 and 125 are producing the same power!! I don't understand this. Do any of you Saito experts have any experience with the difference in these two motors?

I can tell you that I've been around motors for a while now and I know how to tune a motor and both motors are tuned properly. After doing some reading on similar threads, it looks like 8800 - 9000 is about average for the 125 using the 16X6. If this is true, then I don't understand where all the extra power is going.


The 100 is supposed to produce 1.8hp and the 125 at 2.2... Where is the 0.4hp going? The only benefit that I can see is that the 125 is using less fuel than the 100. I know this sounds strange, but if you look at the Saito-Information website under the fuel tank section you will see that the 125 uses less fuel, per SAITO. Very strange.

Anyway, I'm very disappointed with the performance of the 125 and am wondering if anyone else out there have noticed the same thing.