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Hi All

I have a 2012 Yager GT 200i that I've owned for 2.5 years; it only has about 5.5K KMs on it. When I gas it up, I always fill it so the gas is within sight when looking down the filler hole; I know this is high, but I like to fill it to a visibly-repeatable level so I can keep detail track of my mileage, and it's never caused a problem.

Whenever I've filled it, I've either ridden it for some distance afterward (and thereby used up some gas), or taken it straight home and left it on the sidestand. The other day, I filled it, but took it home and put it on the center stand, because I needed it that way to switch to my large winter windscreen; I then left it like that for several days. When I next drove it, I noticed that it now misses under hard acceleration, which seems to me like something is inhibiting the free flow of fuel. For now, I'm assuming that excess gas has somehow gotten into someplace that it shouldn't. I'm basing this assumption on a Leader-engined Piaggio product that I previously owned, that dumped excess gas into the air filter, and would cause the bike to behave similarly or die, until the filter was cleaned out.

I've looked at the service manual, and see that there's a "breather tube" coming off the filler pipe, but without taking the bike apart, I can't tell exactly where it connects into the filler pipe, or where it leads to. I have a suspicion that it connects on the right side of the filler, because I've never had a problem when the bike is parked on the sidestand (i.e. leaning left), but when the bike is on the center stand, it may be that excess gas could then drain out through a right-side breather. As for where the breather might drain, I can't believe the tube would run all the way from the filler at the front of the bike to the air filter at the back. So I assume it goes somewhere else, but I can't see it in the manual.

Ant Knowledgeable opinions on this situation would be greatly appreciated.