whats next?

[below100hz]

running the setup in my sig and im looking to see what else i can get for power from this motor.
what else can i do? without spending a ton of money. rev box? port the head? removing the choke?

id like to swap it with a 450 motor but i dont have $1500 right now for that

thanks for the help

[trx400EXtreme]

450r carb.... great mod for a 400ex. curtis sparks advanced timing key. only 20 bucks. with those two mods your throttle response increase will be amazing. and yes porting and poliching is probably the best thing you can do to a motor. you will never see the full potentiol of your motor until you do that.

[below100hz]

from what ive heard sparks says not to use the advance on modified motors because of heat. it runs pretty hot as it is, maybe if i put a bigger oil cooler on it?