Tank Vent 2013 te511

So I took my 2013 te511 on my first tight single track. I was having a blast until My bike would lose power and die out. Like I was losing fuel or a dirty filter. Long story short I noticed the PO capped the right side breather hose at the fuel fill. one day after this ride, I opened the gas cap there was plenty of suction. I am assuming this was the problem. However. I rode the bike last fall on some pretty open logging roads, and I rode it this winter with a timbersled kit on it. I never had any problems then, and the vent was capped off then too! I am going to test it out later today, but I am a bit nervous. I ended up leaving my bike on the trail yesterday. Bike has fmf Map3 from zipty and emissions canister removed. Why would it do this now and not then?????

A similar situation for me. There is a cap on the breather, but it comes like that from factory. I believe it is just so dirt cannot go in.
I had a timbersled on my 2012 this winter. Now the power seems way down with the wheels back on. Bikes starts and runs fine.
Half to full throttle, not much response, I did the TPS reset, as I was having a high idle also. No improvement. The searches say to try the TPS connector, as it can corrode.
Maybe more moisture at this location with the snowbike setup ? Let me know if you found the solution !

yep- that's your problem. the vent is on the right side of the filler/cap, not on the cap itself (& the vent is for BOTH tanks). Crack the cap, ride home. Route a vent tube on it that goes to the front of the bike and higher than the cap ( go ahead and put it through the steering stem).

you're either probably tightening the cap more now (btw, the stock cap is famous for fu*king up the threads on the filler neck) or the stupid vent cap that the PO put on is more leak-proof now (filled w/ dust??)

I added my nomad tank and connected it to the breather. My bike was having trouble starting until I disconnected it, after that... no more problems

did you still have your 1-way valve connected from the vapor recovery system? ...that would do it. (edit: it's a 2-way valve. but still...)