Adverrun upgrage kit
I have been using an original Adverrun XS withn straight cut gears on the front prop driver. The guys at adverrun have now developed an upgrade kit to enable the drive to be updated to the latest spec including the soft rear mount. I fitted this to my motor this week. Fairly simple job. The difference it makes to the overall sound is quite astonishing. It is now much quieter and seems smoother too. I can recommend it.