Ok so u got the bottle and some duct tape,put some over the hole in th bottle and refit it,test it like this and then without the tape refitted and test it out,but I mean test it with rules check your revs etc and try and c if it will make the hill etc with or without that little box of black magic
I went out yesterday and before i left i plugged the hole with a bottle cap and to be fair i do belive it made some diffrence to the power it seemed to have a lil more poke so i guess the bottle cap is staying...and it changed the exhaust note more in the same way as when you'd remove the airbox snorkle it gives,it a lil more bass to it when you accelerate...hope this helps
The bottle between the airbox and carb removes air from the combustion mix, and slightly reduces power on a correctly set up bike. No WR200 or DT200WR I have seen or owned have these fitted.