That was the technique we used in the olden days to start a flooded carburated car engine. Put the pedal to the floor and crank it.
Kind of, but the DT300i is a fly-by-wire job - The anti-flood mode is a legit service mode, apparently.
Common issue? Sad
Every bike has its quirks. The Silverwing wallows when cornering hard, The Bergman 650 oscillates at high speed, etc. Given that this quirk is that I have to hold the starter button for 3 seconds - I think I can deal with it
Have you taken it in to the shop where you bought it? It sounds like an issue that should be handled under warranty.
Unfortunately, no. I have yet to hear of a shop that even knows what to do with the DT300i. Most reported here don't even bother with the service manual. Secondly, the issue ONLY manifests itself under very certain conditions - ALL of which seem to need to be met:
* The engine must be allowed to cool and sit for at least 4-5 hours.
* It must be cool outside when the engine is turned off.
* The unit MUST be in direct sunlight for the duration of the sitting, and the temp delta must be significant.
This issue NEVER happens: In my garage, in the shade, when the engine is warm, on cloudy days, on warm mornings, on cold evenings, if it is HOT in the garage, if it is COLD in the garage, when parked for an hour or 2, when parked overnight, at night, in the morning, etc.
So having the dealer do the troubleshooting would be difficult/useless. Once again, given that the solution is twisting the throttle and holding the start button for 3 seconds, on the occasions when this occurs - I'm not bothered/worried at all.