400ex big gun rev box..

[da 400ex]

hey guys i was thinking about gettin a big gun rev box.. i just wanted to no would it be a good investment for 125 bucks are would it be a waste of money.. if it is a good investment whats will it improve? thanks...

[Duf6]

i have one it advances the timing a little so its a little snapper but when i bought mine it was only $50 dollars you'd probley be better off with a sparks +6 degree key

[da 400ex]

where can i find that?

[Duf6]

you could get them sparks racing website or check the 400 ex section sometimes when people get high compression they sell them or if your's is high compression now a guy called wheelie makes +3 and+4 keys cause advancing the timing and high compression makes alot of heat

[da 400ex]

ya thats whats i was about to say mine is a lil over stock only a 86mm piston but it said it will only work with the stock piston.. so i need to find something else.. i have stage 1 cam about to put stage 3 86mm piston. jet kit, white bros e series slip on, amr rev box, small port and polish.. and k&n filter

[tflatt]

if you do any type of riding outside of motocross be leary of the key we have had bad luck with them shearing