R400 coming up 3 years old. 2500 miles on the clock (yes - I know I should get out a bit more!) Engine has been fine following issues with start up when first built (a problem in the engine wiring loom). PH Sunday service at Silverstone last October - on track it was fine for a while but then behaved as if the rev limiter cut in at 6400. It is normally around 7200 I think. Change up lights all flashing like mad at 6400, but I have never had much faith in the way they were set up from day 1. Out for the first time this year today - same issue and absolutely consistent - 6400 revs and no more. Plugs out and look good, nothing obvious around the engine area. Anyone had the same experience? Any ideas of how to solve it? And since Caterham Midlands has closed I'm wondering where to go for servicing, bits etc.... Many thanks Peter