RE: RCV 120 Muffler
Hi
This isn't normal and could effect the exhaust note. We find that sometimes during the running in process, mufflers can fail due to the increased vibration. Once normal running is achieved this rarely happens.
Assuming your engine is still covered under warranty, we will be able to supply you with a new muffler. If you email me your details I can pop one in the post to you. In the meantime, as long as the exhaust note doesn't bother you, it is still fine to continue running the engine in.
Best regards
Laurenne