The thread is 7 years old so if the OP didn't reply I doubt they will now.
All the suggestions above are valid.
I would add a compression test. These terrible old Rotax engines have weak head gaskets and automatic decompressors, so both a possible way to turn a 40 HP engine into a 10HP one. The decompressor thing in the head would make for an intermittent fault and be unfamiliar to Bullet mechanics in Kathmandu. Would tend to make a hissing noise though.
Also, try the Chain gang F650.com website, lots of info parked there in the FAQ section.
Andy
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