Thanks much for that description R1 ! That would jive with the bike sounding like it was starved of fuel, and explain why 5-10 mins later it would start (air leaking in ?) Will confirm the issue resolved as soon as I can/next ride. Re the battery, I've heard of the Lithium Ion batteries, but also heard that were not that great for cold starts (in Canachuk, so we do get lower temps). Did you have issues with your stock (YTX5L-BS) battery ?