keep cooking 13x3 help?

[450kid]

After only ever run stock class with a saturn 20t I thought i would bang in a modifeid brushed last night but just cooked it with stock spur and 21t pinion, any ideas were I should start? Also have a 12single to try?

[450kid]

Its in my rb5!

[tisher]

dodgy motor? I run 6.5t brushless with a higher gear ratio with no problems

[daz]

Are you running lipo with the brushed motor?

[450kid]

yes running lipo just been to batley and cooked another so put a 82 spur and 17 pinion on a 12 single was better but still a bit warm