i have a 258 bored 30 over timing was advanced when i got it so they say idk. we had it out couple weeks ago. just to putt around in. it dies climbing a 4 foot wall getting out of a creek. i thoguht my wife stalled it. but she is saying she didnt but who knows.... i now have no spark , i changed the coil and still nothing.. any ideas on what it could be? it has a webber carb on it also.....