Unicam450r
05-06-2006, 08:23 AM
I just picked up a new Janssen super high rev box. It is supposed to be 2,000 rpm increase over stock. My quad seems to be popping and cracking on the top end now..... I'm wondering if I should go up on the main jet? it's around 3/4 to full throttle which should be the main. anyone put a rev box on there 04/05 450R's?