Hello,
Just bought a YS 120 with no muffler.Any idea what size is the thread for the muffler ?
I am looking for a muffler and pipe.
Thanks
Phil

Thanks to Dave: Although RC Specialties does not recommend their Turbohreader for YS, they do have right angle adapters that will fit YS. Here is a copy of their website info.: Looks like it 13mm x 1mm thread for the 120.
[TABLE]
[TR]
[TD="colspan: 3"]YS Engines
[/TD]
[/TR]
[TR]
[TD="width: 33%"]Exhaust Thread Size
[/TD]
[TD="width: 33%"]Engine Model
[/TD]
[TD="width: 33%"]Applicable Product
[/TD]
[/TR]
[TR]
[TD="width: 33%"]11x.75mm
[/TD]
[TD="width: 33%"]YS 53, 63, FZ 70
[/TD]
[TD="width: 33%"]TurboHeader not recommended. Use RCS11x.75/90 with stock muffler.
[/TD]
[/TR]
[TR]
[TD="width: 33%"]13x1mm
[/TD]
[TD="width: 33%"]YS 91, 110FZ, 120, 140S, 160DZ
[/TD]
[TD="width: 33%"]TurboHeader not recommended. Use RCS13x1/90 with stock muffler.
[/TD]
[/TR]
[TR]
[TD="colspan: 3"]NOTES:
[/TD]
[/TR]
[TR]
[TD="colspan: 3"]Adapter
[/TD]
[/TR]
[/TABLE]

Here is a link to a chart with many 4C engine muffler and crankshaft thread sizes. This will give you some options. For a short time I used the muffler off my YS 63 on my Enya 90 4C.

http://www.dieselrc.com/download/fs_threads.pdf

Ken