It's been a while since my last post here, my 2006 GT200 is my daily rider and just got a fresh set of tires which are much nicer in the damp fog we often wake up to in San Francisco.
But starting up has been a problem recently. I usually have to give a touch of throttle when I start the bike up but that's just a quirk of being almost 15 years old I guess. The last two weeks has been REALLY rough though, and I have to really give it 10-15 seconds of throttle before the bike will start and keep running on its own. The starter sounds lively and no different than it always has, just needs a bunch of throttle to get going, even when starting up after only a few hours of being parked. Runs great once it's going, no stalling or hesitation.
I read the typical help threads here for starting rough. I thought maybe I had some gas in the evap system so I disconnected that... no dice. Then I thought it might be a spark plug issue but from what I can tell it's fine (only three years old, photo here).
Not sure if this is a red herring: I'm not always super diligent about putting the battery tender on, especially during the summer. But this all started a few weeks ago when it was colder (40s at night - I know) and I had to start giving it a bit more throttle when starting up. I've been putting it on the charger every night now but it doesn't seem like startup has gotten any better, if anything it's a little bit worse each day.
What are my other options here for investigation? I was *just* in the shop for new tires so I'd hate to go back for a mystery issue.