Radio Equipment and cogging
Would go with the other posts on here, Spektrum all the way over the Code radio. If I had the money would now go for the Futaba 2.4Ghz system but each receiver is nearly 100 quid.
Usually if you have cogging issues I would check the sensor wire first, check it has not popped out partially at one end or you could have a dry joint inside the motor or ESC causing problems.
One last thing, I seem to remember that some brushless speedo's were incompatable with certain brands of brushless motor ( they work but cog badly ), might be worth matching up the same brand motor as your Speedo.
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