Hi, I´ve just fitter new stainless steel downpipes and a Vipor can, i took my bike out for a teat run and when aAccelerating it seems to get to 8000rpm then stop for a bit then at 9000rpm it takes off agan, i did leave the bike over night with out any downpipes do you think this could of caused a problem or could it be something else any ideas would be great.