Engine stutter around 4k rpm

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Joined
May 15, 2009
Messages
277
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Bike
Aprilia 650 Pegaso
Hello folks
Had an odd experience today. After a tour around Paarl Nature Reserve and thence Franschoek, Botrivier and back via Gordon's Bay, the engine on the 990 started stuttering and not wanting to rev. It was a hot day so perhaps that came into play. It would idle fine and rev to about 4k rpm, where it would start to stutter. Managed to cruise home by riding the engine really low and just babying her home.

Not sure where the problem lies here so looking for a few ideas.

What are the likely culprits? Failing MAP sensor? Clogged fuel / air filter? Just abheat issue and maybe replacing coolant with a greater water ratio?

Remove all the smog canister bits?
Ideas appreciated here

Thanks
 
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