The Mojo 25 comes out around 26 -28 oz.... I'm thinking the 400 was designed for a lighter load.... I don't have the specs right in front of me though.... You're best bet is to go with one of the following:
I used the following on my second E Taco:
AXI 281412 Motor with reverse mounting kit.
www.hobby-lobby.com Castle Creations ESC Phoenix 35
www.castlerc.com Tanic 2500 mAh 3 cell LiPoly batteries, 12C discharge.
www.tanicpacks.com APC 11 x 4.7 SF prop
www.apcprop.com I used the following on my Mojo 25:
Lehner 1020/15 Phoenix 35
www.b-p-p.com Cobri aluminum gearbox 12 tooth SS pinion, 70 tooth spur
www.b-p-p.com 12X6 APC SF prop
www.apcprop.com I'll be using the following on the Mojo 30:
2818T/900 Torque
www.extremeflightrc.comAirboss 35 esc
www.extremeflightrc.comThunder Power 3 cell 2500 mAh battery
12x6 APC-e prop.