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Has anybody used a normal car 12 volt coil on your bike and did it work ok?

Hi guys my bayou just stopped going the other day,I put a new plug in but still did not go,then all a sudden it went so I used it for about 30 minutes and it ran perfect.Now it will not start again,I have been trying for the last 2 days.I have checked all the electrics,it has plenty of spark,plenty of fuel,the valve clearances are good.It turns over fine just will not fire.Tomorrow i am goint to check the set up timing(i think thats what is called)If thats not it there is only compression left as I don,t have a tester I put my finger over the plug hole and it popped my finger so there is copmresion there maybe not enough though. steve.

I just bored out my 87 Bayou 300 .020 over and installed a new oversized piston and had the valves vacuum checked. With everything back together and after setting timing and cleaning carb I am having a problem with it trying to start. When the engine turns over it will pop as if it is trying to fire off but will not run. I have about 125lb compression I have fire and I sprayed fuel in carb with these it should at least try to run. The only thing I can think of is a timing issue. I have lined the cam sprocket up with klf300 and set accordingly to the to the T mark on the alternator rotor. I have taken it off and double checked it twice I have even set it one camchain link forward and then aft of the correct Top setting at the camsprocket. I have set the valves to spec. When I turn the engine over by hand the valves open and close like they should at the right interval and the piston is at top dead center when aligned with the T mark and cam sprocket are in there right positions. Can I use a timing light when I try to start the engine and check for correct timing? I read something about a timing advance not sure how that works. Is there a sure way to check exactly when the engine fires?

I just rode my klf 300 all day yesterday, and today when i went to unload it it would not start. When i took the plug out to check for spark it only produced a very faint weak looking spark and it was not consistant with rolling over, is this from a bad ignition coil or could it just be a loose conection somewhere?