Hi folks,sorry another request for help.
My Serveta rode perfectly yesterday on a 40 mile jaunt with a couple of refreshment stops.Then after the third stop it took a few kicks to get going and wouldn't idle at junctions.Got home and found that I could only get it to tickover with the choke on.
Suggestions please for most likely causes?
200 lost tickover and harder to start
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Air leak? could be several things that have come loose :- inlet manifold, exhaust downpipe, cylinder head, carb,spark plug or something a lot simpler like a split air hose rubber? fuel flow , blocked tap/filter , float sticking? or the tick over screw has wound itself out. Good luck 

The pilot jet is blocked.
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Yep,carb clean and it now seems fine
I was surprised by the amount of dirt in the carb (running Breathe Sweet type foam filter)
I've now put a pop sock over the outer layer open cell foam to add another layer of finer filtration.
I was surprised by the amount of dirt in the carb (running Breathe Sweet type foam filter)
I've now put a pop sock over the outer layer open cell foam to add another layer of finer filtration.
Most dirt in the carb comes out of the petrol tank. Anything sucked in ends up in the barrel.
Try an inline fuel filter.
Try an inline fuel filter.
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