Cold idle up valve intake pipe.

:toothy10: that was a great mod and it only took 2 minutes. i rate it as the cheapest with such a huge effect.
I almost have no popping now, it really did reduce it to 95%.
just to be sure, are there any side-effects?

No side effects at all to the bike, but don't tell the greenies.

I'd say there is a side effect. You loose the smile on your face that all those lovely explosions produce hehe

cant believe the effect this as had on my 2-1 system brill,nice one Kev http://www.xt660.com/images/icons/icon7.gif http://www.xt660.com/images/icons/icon14.gif

checked, my bike still turns on the car alarms when i pass them :) so off with the popping, it still sounds great :)

The AIS injects air into the both exhaust ports after the exhaust valve.

http://i201.photobucket.com/albums/a...x/XT660AIS.jpg

Something really weird happened right after I blocked the AIS.
The bike does not start well anymore, when cold. It happened exactly right after i blocked the pipe. First i thought it was some weird anomaly, thats why i didnt mention it right away. I have to press the starter button sometimes for 20 seconds or even more. Almost emptying the battery and when the engine starts, its around 200rpm at first, then slowly gets to normal idle rpm.

Now I dont know where is the catch, at the same day I also washed my bike, maybe some electric connection got wet, and I tanked some fresh gasoline, maybe it was crappy gasoline? I havent put any new gasoline yet, and i didnt unblock the AIS yet, just asking if it is even remotely possible, that the AIS has something to do with it :(:(

Just checking you did block off the AIS pipe? not the cold start idle up valve pipe by mistake. If you block the wrong pipe you will have cold starting & cutting out problems when the bike is cold.

The AIS would not effect hard starting, it is an emission control device that does not effect A/F ratio at all.

Yes it was the AIS. I tested this by pinching the tube and the popping went right away. Then i blocked the tube for real.
I also cannot believe the cold start fault was the AIS.

Anyway, i dont know what it was, this morning it started with a push of a button. It rained all night and the bike was outside, so it couldnt be any damp issue... maybe.. I will, to be sure, unplug all the connectors and use CASTROL DWF on them.