We sold a new LTZ50 Christmas 2013 This is the only one we have had anything to do with and it has just come back in refusing to rev. Took the carb apart and found a fair bit of water in the bowl. Once cleaned out it runs better but with the rear wheels raised off the ground it still doesn't rev right up. Tried it round the yard and it is less noticable but the rev limiter comes in at a fairly low speed. Is this normal?

 

I bet it is.
CT Racing sells a better CDI for them I think.