Cannot seem to locate a good parts source for this engine.
Looking for information on Header pipe dimensions; nut size, tube diameter inside and outside (substitutions) etc.

A header from the 170 radial, 100 v twin, and 100T flex pipe will all fit.

http://www.horizonhobby.com/Products...dID=SAI100TI74

This is the exhaust pipe for the 100T which has two 50 cylinders.

The same pipe fit the 80 twin, the 90 twin, the old 40 and 45.

They are all long discontinued and horizon probably doesn't have parts anymore. I know they have nothing for the old 45. I bought the last crankcases and backplates for that engine. I bought all they had.

Wouldn't the FA50 work. I know my 2 50's use the 45 size exhaust gasket and I think the thread size is 10MM

The 50 may use the same pipe but it's discontinued also

great response, just finding out about the 10mm thread size puts me on the right track.
Thanks again.

Horizon still makes the short stacks that look just like the original 45 header. They are used on the Saito 170 triple curently.

Send me a PM with your address and I will send one to you. I can also give you the thread specs if you like.

I know this is n old thread but if anyone also seeks Saito dimensions see Mufflers
Answering the queiry a Saito 45 has 10mmx1mm thread