G-Force Heli Senior Heliman Location: Ontario, Canada
| Both 521 and 522 will work with OS or YS, and are identical internally.
The only difference is the 521 positions the muffler 17mm out from the engine. The 522 will position it 8mm further out at 25mm.
The 521 is a perfect fit as Tony is already using it.
Garf
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