ttr600re running rich or lean?

[superfour1300]

my 05 ttr600re since ive fitted a less restrictive silencer
when ridding hard on the road when I shut of the throttle and open it again the bike seems to lag..hesitate for a few seconds then its ok again..
airbox is standard..no mods with standard filter..jetting is factory standard..carb has never been removed in its life..i did a plug chop and plug seems whiteish..thinking of buying a sigma jet kit..
any suggestions...

[*Touring Ted*]

A less restrictive exhaust usually makes the bike run a little lean..

However, bogging which clears is a tell tail sign of a rich mixture..

Isn't carburation fun ??

Was it fine before the exhaust swap ??

[jjrider]

I would definitely say it is lean, opening the throttle slams a bunch of air in with not enough gas till the main gets caught up(sort of). A white/ish plug is another lean indication. If you want, try raising the needle 2 grooves if possible, see if it gets better(this won't be the end all solution but will indicate mixture). A better intake is usually recomended to get the gain from the exhaust you paid for.

[superfour1300]

it wasn't as bad with the standard exhaust silencer..
come the winter im stripping the bike as I want to repaint the frame possibly red with black motor..
I hear good reports about the sigma jetting kits...any of you guys use these?

1998-04 Yamaha TTR600 TT600R TTR 600 TT Custom Carburetor Carb Stage 1-3 Jet Kit | eBay

[jjrider]

I use Dynajets kits but the Sigma should be just fine. It'll give you some options.

[superfour1300]

filled the tank with super unleaded this evening and bike running a little better but will need bigger jets