Very good results following this topic with my TDM900 2004 black 30000km .. K&N filter , baffles  out of stock mufflers  .  Yamaha dealer said they could not make the mixture richer ,  to aviod surging and snatchy throttle responses at low revs . I'm not sure what they do when tuning , but  possibly the CO and Co2 levels need to  above state regulations , and they don't want to go there ?
By the way , they suggested a Power Commander at $400 and tuning, dyno @ $400  ,  should help  .
I disconnected brown lead in the  ECU  , and this did not seem to make a lot of difference  .
My CO readings were   , c1 = 17 and c2 = 17 .  I adjusted to c1 = 28 and c2 = 28  , and I now  have a new bike ... not perfect but VG , and I will probably tinker a little more with setting in the 30 range . I am not a mechanic and use the dealers for servicing ( I now wonder Why? )
What has happened  :Â
Very much improved low gear  rev smoothnessÂ
Bike feels less jerky  , and has more smooth power through the gears .
Engine was running at 4000rpm in 6th gear at 100km/hr ... now 4000rpm is 110km/hr  ..amazingÂ
Engine was running hot in city  traffic and in the red ,  with the fan on regularly , ; runs much cooler now in traffic ;
On highway runs at bottom end of of temp range .
Fuel economy does not appear to have changed very much  ... was getting 420km from tank now is about 400km  ,  with mainly  highway & a bit of  city .Â
Was considering changing bike and now don't have to .
Must say  , why could Yamaha or their  dealers  not sort this out  ,  a long time ago .
Good luckÂ
Grants
By the way , they suggested a Power Commander at $400 and tuning, dyno @ $400  ,  should help  .
I disconnected brown lead in the  ECU  , and this did not seem to make a lot of difference  .
My CO readings were   , c1 = 17 and c2 = 17 .  I adjusted to c1 = 28 and c2 = 28  , and I now  have a new bike ... not perfect but VG , and I will probably tinker a little more with setting in the 30 range . I am not a mechanic and use the dealers for servicing ( I now wonder Why? )
What has happened  :Â
Very much improved low gear  rev smoothnessÂ
Bike feels less jerky  , and has more smooth power through the gears .
Engine was running at 4000rpm in 6th gear at 100km/hr ... now 4000rpm is 110km/hr  ..amazingÂ
Engine was running hot in city  traffic and in the red ,  with the fan on regularly , ; runs much cooler now in traffic ;
On highway runs at bottom end of of temp range .
Fuel economy does not appear to have changed very much  ... was getting 420km from tank now is about 400km  ,  with mainly  highway & a bit of  city .Â
Was considering changing bike and now don't have to .
Must say  , why could Yamaha or their  dealers  not sort this out  ,  a long time ago .
Good luckÂ
Grants