I have just recently put an fcr, rs2 and 3x3 on my 2009 drz 400 sm. After some initial dramas the bike now seems to be running fairly well bar for a slight idle issue. When cold and with the choke out the bike idles at warm speed, not slightly higher as you would expect when the choke is on. When you give it a slight rev it then settles on the higher choked revs. When riding it has a very slight surge issue, kind of like it running out of fuel. Only very slight though, it also lets out the odd back fire whilst cruising too, just small ones. Then when you pull up at the lights it sounds like it's about to stall. Give it a slight rev and it comes good. Any ideas friends?