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before you start it in the hot sun, crack the fuel cap and listen for a swoosh.. venting might not be great with a hot tank of gas expanding. ?
Hot tank sitting in the sun = hot gas fumes going through the vent line & overflow line down to the canister. If you've ever overfilled the tank to where gas runs down either of those lines into the charcoal in the canister, it could be partially clogged and the fumes from hot gas are exacerbating the already partially clogged canister. The evap canisters on motorcycles/scooters are highly likely to cause these kinds of problems if you park the bike in hot sun. If you disconnect the overflow & vent lines from the canister and run them down past the frame, chances are that your problem will go away. BTW; I had this happen on a Vespa scooter that my wife used to own. It was very easy to overfill. It also happened to me on a BMW that I used to own. I removed the canister on both and ran the lines towards the ground and the problem was solved. Since then, I've removed the evap canister on every bike that I've owned; No more problems of this type and no pressure buildup in the tank due to poor venting.
A "canister-ectomy" is probably in order, eventually.I am not sure about all that is involved, but I do plan to treat my Norge to a full "canister-ectomy" at its next service. I will let my dealer and his people handle it. I think I will treat our Vespas to the same at their next service appointments.
All,Ok, so last two coffee breaks at my favorite cuppa India Joe place on the V7R have resulted in very hard start after a fast run. Bike sitting directly in late afternoon Sugar Land, TEXAS sun. Black tank. A real struggle, but always manage to start after a minute chugging, then catch, then rough idle. Frustrating, as I often take these kind of breaks before coming home. Before today's ride I checked the evap canister lines and such, everything tight, one was a bit pinched, so I routed it a bit different, and at the pinch flexed it with a pair of pliers. Cold start was immediate and typical, warm a bit at 3000 rpm, idle settles, ready to go. Fueled up about 4 miles from house going SE outbound. Bike warm, not hot: again started right up to smooth typical idle. Today I had a nice run, temp 78-80F, broken clouds, about 80 fast miles. Had a BMW RnineT pass me near Brazos Bend park. He eyed me as I made the left turn north, saw him in my mirrors and he blasted past. I was accelerating pretty hard. Bigger bike, no surprise, but I managed to pace him thru the sweeper curves and such. Got home, exhilarating ride, just beautiful out, a bit windy. Corn is up, soybeans planted, hay perking and even a first cut. So, parked bike in my shaded, open garage. Gear off, drank water, pollen triage, and swept floor. About 15 minutes, similar to my coffee brakes. Experiment: what does Little Goose do upon a hot start, but not sitting in blazing direct sun? She fires up immediately, and smooth, that is what. Hmm. We will ride to church tomorrow. Service is about 90 minutes. My usual parking space has sun, but it is morning and not afternoon. I will see what the bike does on warm start. Tomorrow afternoon I may ride to the cuppa joint, but this time wet a soft cloth, and put it over the tank, bike in sun (there are no shade spots), and see what the bike does. Will a bit of black tank cooling help?Anyway the bike is running just superb otherwise. Prefer not to take it into Mike at MPH if the problem is correlated with afternoon hot sun exposure on the tank, when bike is hot. Guy on the BMW was lucky I was not on the Triumph. He would not have passed so easily....no news on Triumph: no returning emails, or a phone message to repair department. Not really impressed with service.
Since removing the charcoal canister is (in effect) tampering with the emission control system, many if not most dealers will decline to do it. It's not particularly difficult, but if they do it they are at risk of violating state and federal statute. This comment is not to say the deed should not be done (somehow the one on my Norge is missing) but you may need to do it yourself.
My bike kinda smells like fuel even with the canister when I sit on it in hot sun, so it won't make that much difference :)