here is my problem... My bike was running great the other day but started to act as if it were running out of gas, which it appeared to be. I returned a day later with new gas with the intention of riding and she wouldn't start. She would notion for about a second then die off, and after she would die if i kicked with the decomp lever released she would give off some smoke which i never noticed it doing before. After all the exhaust was clear then and only then would she notion to start again but quickly die. I'm nervous that it's the exhaust valve or something....but am i just a dummy that needs a needs a new plug and that didn't notice the exhaust before?