Just obtained a still new Saito 56. Unfortunately it did not come with any exhaust. I figured I had something that would fit, but apparently the 45, 50 and 56 are a different size muffler thread. 10x1mm. I was looking on Horizon site to buy something, but stumbled across this item:
Muffler Adaptor Nut:KK by Saito Engines (SAI170R3130)
It fits the 170R, which I presume has the 10x1mm exhaust threads. My question is what does it do? Allow 12x1mm muffler threads to be used?