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Algernonny

540 motors into SRB Mk1 and Mk2?

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I am building an SRB runner using Mk1/Mk2 gear cases. I planned to buy a Sport Tuned 540, but understand that the new 540 cases are larger diameter than the original 540s.

Could anyone confirm this, and what the alternative options would be. I would prefer not to dremel out the cases but want a motor with more performance than an old silver can.

AlG

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I used Super Champ gear cases in the past. They can accommodate modern motors. And also have brass internals if they're complete :)

Although, that might be a costly mod these days....

And rere's.. but you have to do some fettling to use original arms (from my experience).

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