[DannoXYZ]

Originally Posted by Triple Jim

Dan, I've actually had my 250 act like that, but it's when it's been sitting for a while and the float bowls are low. Until the petcock opens long enough to refill them it wants to sputter and not quite start fully. I think your newgen petcock has a "prime" position so you can fill the bowls before you try to start the engine. Mine does not. It's Off, On, and Reserve. I may put a Tee in the vacuum line with a short hose and a plug so I can suck on it for a few seconds when I need to fill the bowls.

Anyway, you might try using the "prime" position for ten or 15 seconds before you try to start it, and see if that makes any difference. If it does, it may indicate that something is causing the fuel level to be low in the float bowls, even when it hasn't been parked very long.

Ah yes, I've have had petcock issues that required manually priming. Saves 5-10 seconds of cranking in my case. Turned out petcock needed rebuild as diaphragm wasn't sealing and opening fully.