Engines upgraded to 35000rpm. You will need an Rx43 motherboard to do this. If you don't do this, you will experience a lot of heat in the wiring from the battery to the board. Also order the remote control together with the board. Anyway, I couldn't get the old remote to plug into the new motherboard. Even if you order large motors. Just take engines. I had to replace the gearbox with the original 900 engines. It's all interchangeable. The gearboxes supplied with the engines have a high gear. They find it difficult to get started.
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