Hi all.

Just bought a used '05 XT660X and have few questions.

1) CO is set to 80. But there are no any mods installed on the bike. Can 80 be a normal value? I think previous owner could change it to get "moar power" Should I set it to 0? I tried to do that and engine works "different", but I don't know what is "normal" work Any advice will be good.

2) Have strange symptom: if accelerate to some speed and then keep it unchanged (e.g. 30mph) I get abrupt loss of power after few seconds. For example:
I put 1st gear and start to move. Give some throttle and switch to 2nd gear. Then I need to keep my speed constant so I just fix the throttle on some level. But after few seconds of such a ride I feel something like sudden loss of power - engine suddenly drops it's revs for about 1/4 from origin value and so I feel a abrupt loss of speed, which is very-very uncomfortable. After this I need to give more throttle to get my speed back, but feelings are like engine really lost it's power and accelerating much slower. I am facing this problem on any gear and any speed, but seems it occurs only when I am trying to keep the speed constant for a long time, not accelerating. Playing with CO doesn't help.


3) And the last problem which can be related to the previous one:
If I give some throttle for a short time on neutral gear - engine keeps high revs for a few seconds after I released the throttle before return to idle revs. Playing with CO doesn't help.

Will be happy to get any help. This bike is really rear in my country so I can get help only here, on this forum


P.S. Sorry for my English.