I'm currently running a Orca Q spark 7.5t combo and so far it has been as good as my LRP Speedo. The Q Spark has a turbo function and is very easy to use. Telstar will give you a good price on a new one.
Or you can go for a new speed passion Esc for around £90.00 as Matty said and purchase a new HPI Flux motor for around £50.00.
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