I also use the Viper VTX1 but with a Sanwa receiver and low profile Blue Bird servo. Never glitched once and mighty quick, easy to program and smooth. I find even with the endbell timing turned up on my 13.5t Thunder Power motor and the with the motor getting pretty warm the speedo is as cool as a cucumber.
A big shame that no one is still importing this unit into the country even though some shops are the VTX10R units.
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