Hi guys. I have an 028AV that I'm fixing for a friend and I have a question about the chain brake. The saw runs fine and all but when I rev it full throttle and hit the chain brake, the chain stops right away however it seems like the engine "overruns the clutch". It then takes a few seconds for the clutch to engage. Is this normal? I have an 038AV and it does not do this; when I engage the brake on the 038, the engine idles down suddenly and it doesn't freewheel. I took the clutch apart on the 028 and the clutch is totally different than an 038. There is a round part with three "ramps" on it. Is this responsible for the freewheeling or is the saw not supposed to do this. I hope you Stihl experts can help me. Thank you.