i did it to remove the popping on deceleration as i live in town and go to work early in the morning. others do it for tuning as you cannot get an accurate air/fuel reading with the stock set up.
yamaha does it to meet emissions (i would imagine) and anything done for that is rarely to improve performance...on any vehicle.
Cheers for that, I'll keep my popping, and the bikes quick enough for what it is I take it there is no performance gain simply by blocking this system up?
From what I understand from reading this the system simply introduces air to the exhaust to aid in eliminating unburt fuel in the exhaust system on overun.....thus the "popping" as the fuel is burnt as it hits the exhaust, this in turn simply lowers the emisions coming out the rear of the bike. The downside to this is the sensors used to read how much unburnt fuel is escaping combustion (in dyno tuning) dosn't get an acurate picture as the bike is getting rid of it before it reaches the sensor.
Wouldn't temporarily blocking the system be more benerficial, tune the excess fuel out on the fuel map the reinstate the system? I'm just wondering what effect excess unburnt fuel will have on the cat over an extended period of time? Personaly, if you have issue with the popping noise, change your riding style in built up areas, ie use less engine braking, run in a higher gear to reduce noise also, possibley fit a switch mounted on the bars to switch off the smog plate solunoid at times you want to keep the noise down. If there is no gain other than a reduction in overun popping this is a lot of work to simply increase the bikes emitions. obviously block it for the dyno but a permanent disconection of this system seems a bit OTT..........
This is obviously just my and nothing more, for those who like to mod fill yer boots just I think there are more posertive mods which would be more rewarding of peoples time effort and money.
I shall now get back under my bridge, whilst apologising for sounding a bit condersending.......sorry guys, I can see a benerfit for some but it's such an extreeme solution for little reward, there must be easier alternatives.