jerky throttle cable

[miller1899]

Evening

I had my throttle cable replaced a couple of weeks back (on a Griff 500). It now seems to be a bit jerky at times, so that 200 or so more rpm than I wanted may make a sudden guest appearance. Any ideas? Does it need to bed in or can it be adjusted? Perhaps it needs some oil but one of the threads I saw suggested that grit may get in. I have used the search facility but not come across quite the same problem.

Thanks

Miller