Moto GP Racer
Join Date: Feb 2009
Location: shithole o' Nor Cal
Thanked 638 Times in 595 Posts
Feedback Score: 1 reviews
if stock midpipe and cat assy., ......could it be your exhaust flapper valve motor cycling open/closed ?
(noisily, it needs some lube to the system of cables and pivots..)
Drive motor located left side of rear cowl by batt.compartment....with 2 cables running down to flapper valve system near bulgy douchebag part of exh.
also, be careful of flooding bike when start/stop if cold....these bikes WILL flood, and then it's a weird ritual to get them started again...
do this testing with bike fully warmed up only!