C90 was running OK but I have just had it serviced, plus new mirrors, new brake shoes, chain slack tightened plus someone ripped the HT lead out so they put in a new plug, new ht lead and coil. But it wasn't running right after this(spluttering and cutting out). So they cleaned the carb and valves. Still the same so they're putting in a new 2nd hand carb. Now we're up to £160 before the carb goes in. But I don't think it'll make any difference.There's nothing wrong with the fuel tank either, they've run it off a 'dummy' tank and it's the same. Any ideas? And does anyone know of a mechanic who deals with c90's all the time who is based in London?