The road leading to the little 'superette' where I occasionally buy a\nsandwich, has an utterly _shite_ surface. So you can imagine the fun\ntoday, when, every time I went over a bump, the bike 'lurched', as if the\nthrottle had been brutally (no other word for it) shut.\n\nIt _only_ (or almost only) happens when the bike goes over an uneven\nsurface, and if I then clutch and try to rev the engine, I can whack the\nright hand full open, and the engine refuses to go over 2000 rpm.\nOccasionally, I can 'cure' it by, if I find a sufficiently straight piece\nof road, I cut the engine and restart it.\n\nI'd plump for fuel filter, as I did run out of petrol that time, and it\nmore or less started around then. It might also be wishful thinking, as\nwhen they replaced the fuel filter in the South of France, I was physically\npresent in the workshop, and so I know how to remove the tank etc. Also, a\nfuel filter is (IIRC) 20¤, whereas a pump is a hell of a lot dearer.\n\nAny ideas what it could be ? Could it be the fuel pump ? Could it be\nelectrical ? Do I buy a filter and whip off the tank this weekend ?