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I know this is a car repair forum, but I’ve kinda exhausted my usual sources of info, and the people here are much more mechanically inclined.
I’ve got a 2005 Ninja 250R that I’ve had sitting for 2 winters now. Last year in June a guy I knew who works on bikes offered to clean the carbs for me for a song, and he did, but the engine still just wasn’t running right after that. He said it was the spark plugs and I believed him, but I didn’t get around to changing them before winter hit. I ended up letting it sit with a half tank of gas with Seafoam in it.
Well, I finally dragged the bike out, ripped all the faring and the gas tank off, and changed the plugs. I also charged the battery and drained the float bowls to check for corrosion, but the gas that drained looked clear, so I figured it was okay. I hooked everything up and gave it a crank, and it finally turned over.
The problem is it won’t stay running. With the choke on it will very gradually work its way up to about 5k rpm but then die the minute I try to lower the choke or anytime I touch the throttle. The throttle part is what has me baffled the most, any time I so much as try to crank the handle the bike dies. I’m not really sure what’s going on.
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