RE: OS 46AX - OS61FX
Thanks,
That seems reasonable to me. Start with the popular 46AX and 1.20AX (is the 1.20 size popular in the USA).
I notice on the OS website the OS46AX is 17.2oz with muffler, the 61FX 19.4oz yet the 91FX is 19.3oz. With the 61 and 91 the same weight maybe there is not much of a demand to the 61 size anymore. The 1.20AX is 20.--oz so as you say they maybe tending towards two main sizes of engines.
I cant find any reference to a 55AX, only a 55SX Ring. That may be a good sized engine for many models.
The 46AX is half the price as the 61FX at the LHS I frequent. Quite a difference in price.
46AX 112USD
61FX 227USD
Cheers