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Thanks, Robo, for the tips and perspective. I'd been waiting to get too deeply into greasy troubleshooting, partly because I'm an old guy with limited energy, but mainly to allow the shop to do what they can while under warranty. I had never been very confident about them, but my recent visit was all the more discouraging.

First, they informed me that it was showing no error code, and the diagnostic tool showed no record of any errors. Frankly, I believe they probably reset it before doing anything. I had been checking for any change in the six-blink code every day for weeks -- including just before riding it to the shop. Big coincidence if it just happened to clear the moment it was in their hands. Then they told me if it had been showing an error it would have been recorded in the diagnostic history. Well, I said, then that's evidence of another chip problem (I had not ingested any LSD in decades, so I doubt I was hallucinating those blinking lights). They told me they'd call Kymco to ask what it might mean, but, of course, I never heard back from them.

After leaving the bike overnight, they said their test rides produced no halting or bad performance. I have trouble believing this as well. While it doesn't lurch badly like it used to, it definitely struggles periodically -- and always before it's warmed up. Always. When applying the throttle from a stop it bogs down at first, before kicking in roughly. Not fun.

So unless something new develops in the next couple of months before the warranty runs out I'll be gradually trying some of the many things I've already been reading here. Perhaps the problem will turn out to be something relatively clear and simple, but I'm still not even sure whether to start with the tranny or the fuel. Meanwhile I'm annoyed with the shop, because I know what this machine feels like when it's running smooth. That ain't happening now.

I agree, the periodic rough starting has never left me stranded, so I'm not overly worried -- and one of these days I'll replace the battery. The shop suggested my fuel overflow problem might be splashing when hitting bumps, but I would have thought that would have been documented here many times. (Maybe something's wrong with my cap though?) Mostly I've seen posts about overfilling the tank, which is not my issue.

BTW, a salesman told me he believed the rumor that Kymco won't make this model in 2019, allowing the "superior" 150 to completely take the Like 200's place in the market.

Unfortunately, I'm still waiting for answers -- but I finally have a service appointment scheduled for Friday (and the shop does have a Kymco diagnostic tool). The six-blink alert is back, but now I'm pretty agnostic about whether the problem is more throttle-related or transmission-related. The lurching has never gotten as bad again as it was during the first week, but it's still annoying. Weirdly, it gets a bit better after the first five minutes or so of riding.

Stig, I don't recommend overthinking my particular bike, as it's clearly something of a lemon. I still get the occasional overflowing around the gas cap, unrelated to how much fuel is in the tank. I still get the occasional stalling of the starter. And I still have been given no answer to the question of why an incorrectly sized part was in the tranny pulley system when the bike was supposedly brand new.

Until we learn more I might advise others to think twice before buying one of these 2015 anniversary editions.

I witnessed my error code resetting itself the other day: instead of the normal cycle of six blinks, it started with one longer blink, then six shorter. It repeated this cycle about three or four times, and then stopped blinking entirely. Since then it has sent no error message.

Stig, if there's a connection with the overflowing fuel, it's not because of an overfilled tank. I only made that mistake once, in February of 2017. But, as I've mentioned, the fuel has periodically overflowed when the tank has been near-empty, near-full, and mid-full -- so something is different in my case. No idea if there's a connection between this monthly (or so) event and the recent lurching with TPS error. The bike has never been on its side.

It's now running pretty smoothly, but there's definitely slightly more bogging at acceleration from a stop than before the problem. Nothing serious, but notable. I seem to be getting about five mpg better than usual too (from 62-ish to 67-ish).

The shop never set up the promised appointment -- maybe they suspected the lurching might fix itself. So I guess I'll follow Jonnielights' lead and see what happens. There's nothing I can point them toward now that would register as a clear symptom. Will be interesting to see if the overflowing issue returns now that the error code has disappeared.

I'll definitely update as I learn more. Now I'm hoping my lurching does not improve before the shop can take a look. I suspect my intermittent starter problem is separate -- it's been doing that since the beginning (but, of course, never replicated at the shop). The tank overflow is my last concern, but it is weird, since I haven't heard of others having problems except when overfilling. I did wonder if somehow that and the starter problem might be somehow related to a fuel pump issue -- maybe chip-related. Time will tell, hopefully.

Jonnielights, interesting -- mine is also a gold anniversary special. It's a 2015 that had been sitting unsold until I bought it in January of 2017. No mods, except the seat, mirror extenders, and removing the air intake limiter. Oh also an iridium plug. I've serviced it regularly. Now with 3400 miles I've changed the oil four times, and the gear oil twice. Checked valve clearance twice without adjusting.

So are you saying you had similar laboring and then lurching from a stop, related to your TPS warning -- and then the problem gradually went away when the warning went away?

After my clutch/belt/transmission problems were fixed this past January it's been running great, except for a couple of annoying occasional symptoms: some sort of apparent vacuum problem that causes fuel to overflow -- always when I overfill the tank even slightly, but also sometimes at low and medium fuel levels. Could be weather related, but I've yet to decipher a clear pattern. The other symptom is very common: the starter often snags at first attempt, but then kicks in. Never left me stranded, so I've not yet looked into the brake switch (but I have checked solenoid connections, battery, and ground).

I commute daily about 20 miles. This latest trouble showed up suddenly Monday morning, but went pretty quickly from subtle to lurching. I'll try to troubleshoot more later today. Thanks for all the tips.

Thanks for the encouragement, Crossbolt. I took the cover off and found a pretty thick coating of fine black powder throughout, which I assume is belt residue. Now, is this normal, or is this a big clue? Seems like a lot of powder. Of course I can't replicate the problem on the stand without load, but I did notice the belt flapping a bit whenever decelerating -- even clanking or tapping against something for a second. Maybe this is normal too?

Unrelated: I've looked into the forum profile settings but can't figure out to keep it from logging me out every so-and-so minutes. Can someone steer me in the right direction?

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!