My clutch does fail to disengage at times, making it hard to start in gear, or roll around with the clutch lever in, while in gear. Adjusting the lever travel helped the most. Second comes a suitable fluid.
As to the BBs rattling around sound, are you using a suitablely high test of fuel? Sounds like it might be pre-ignition, or detonation. If fuel is OK, has the timing been checked, it may be too advanced. It could be lots of things, but that is one thing it may be.
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