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I used to know a little about repairing vehicles before they had computer chips, variable transmissions, and fuel injection. Everything's so interconnected now it's hard to diagnose problems.

A few days ago the bike suddenly began bogging down mildly at acceleration from a stop, but otherwise seemed okay. I was suspecting air or fuel -- but it never stalled completely, even though the RPMs sounded pretty low when throttling. (Idle speed seems normal.) Yesterday I started suspecting transmission, as it began jerking a little when the RPMs would reach normal speed (at five or ten mph). Now today it's gotten noticeably worse: very similar to when you try to drive a car starting in second gear. It sputters (labors) -- but then lurches into what feels like a higher gear, and then rides smoothly. It doesn't bog down when accelerating from low coasting speeds -- I have to be accelerating from a stop or near stop.

Judging by how much worse the lurching was today I'm expecting it to become totally unreliable for commuting very soon.

I'm starting to think it might be related to past warranty work on my clutch (discussed earlier here), where they found the wrong-sized pulley or something. I still suspect the shop might have originally sold me a repaired scooter as new, even though it showed only 0.2 miles -- because they had no answer to why it would have been manufactured with an incorrectly sized part. Anyway, they replaced the tranny, the clutch, and the belt -- and I've been riding it daily without trouble for the past six months. Now I worry the belt might be shredding again. But the symptoms are different (before it was low maximum speed). And I wonder if, say, a fuel/computer problem could play havoc with the auto-shifting somehow?

It's a pain in the neck to take to the shop, so I wanted to ask around whether there are some things I can look at myself first. Plus, it's a year and a half into the warranty, and I'm not sure what's still covered.

Thanks for any ideas!

New user here (but I've been lurking awhile). Never ridden a scooter before (but I had several motorcycles in my younger days), so I don't have anything to compare this one to.

Purchased a new 2015 (anniversary model) in January, since the dealer was "motivated" to get it off the floor. It's been serving my commuting needs well, and seems pretty peppy, but its performance is significantly less than what many report here.

Bottom line, if it's within the window of acceptable performance I won't worry about it. It's a hassle to bring to the shop. But if there's something wrong with it I want to get it fixed while under warranty.

I'm a big guy (210 lbs) but I read about other large people going 60 mph. Top speed for me on a flat run is barely 50 (according to the speedo). I've gotten it as high as 53 when on a long down-slope. Also, my gas mileage is always around 57 mpg. I've gotten 62 or so when consciously riding the accelerator as light as possible. Others online report much higher figures.

I now have 950 miles, have changed the oil three times (using synthetic the last time), changed the gear oil twice, checked the valve clearance twice, restructured the seat, and added mirror extenders. I use premium gas.

Does my performance seem way off, or is it within the realm of normal? To my ear the engine sounds kind of gurgle-y at lower rpms, and plastic-y at high rpms (sort of like when we used to clip playing cards to our bicycle spokes). I put a call in to the dealer about the performance. They were going to investigate whether it was normal (and whether I had a chip that could be updated) but they never got back to me. Thought I'd see what y'all thought.

Thanks for any feedback!