25-27 pinion sounds a little high for a 6.5T motor, I run a 24 pinion with my 7.5T. I would start off with a 23 pinion and 76 spur.
You need to select the right belt for your layout.
Standard saddle layout 113T U4474
Low grip 103T U4323
Standard chassis with shorty lipo 117T U4494
Regards,
James.
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