I need some serious help....

[plkmonster2]

Hey everyone, my 200e yammie seems to like to piss the heck out of me... Ok, it started yesterday, when I was riding. I was going around 40, and I gassed it, and accidently hit the kill switch. When I turned it back on, it backfired really hard. I didn't think much of it. I got home, and about an hour later, I want to ride again. I give it a pull, and it sputters. After about 3 hours of tinkering, it starts. I cleaned the plug, and it started... Well, I go to drive it, I give it gas, and it dies. I check the gas, the carb is getting gas. I try again and same thing, it sputters. I get so pissed, I take out the carb, and spend an hour cleaning it really well. Shove it back in, expecting it to drive like a dream. Nope, the darn thing still wants to piss me off. Now I get to thinking, Is the plug bad? So I try 2 new ones, same exact thing... SOmetimes, I can give it very little gas, and it will go, but too much, and it acts like it cuts out really bad again. I thought that something was shorting out, since I'd be going along, and then it will die, then within a few seconds, it will start up with a little pop. I need some help really bad. I was hoping to go for a weekend through week ride, on saturday through next thursday. Well, here's a few more things. I take the plug out, and I check the spark. It is weak as can be, It is a very thin, blueish color, but sometimes it is yellow. I changed the coil with one I knew was good, since it runs like a dream in my dr. No go. My DR has a giant spark, which is a bright blue color. Sometimes the plug won't start, especially if it gets any amout of gassy air around it. I'm thinking this weak as can be spark won't burn the amount of fuel/air mixture that it gets when I give it over 1/2 throttle. I'm also wondering if I may have blown the intake valve when it backfired? But would it run like that? It still has great compression. I'm thinking that my stator is going out... But why would this happen after an accidental backfire? I'm really stumped here, and I'm not to anxious to tear apart my bottom end...

[plkmonster2]

Oh yeah, forgot to add. Would it be my stator if turning the lights on and off, with very little effect? The lights run off the stator,not the battery.

[Mobular]

Your backfire happened as unburnt gasses collected in the exhaust system, and then are ignited when they were lit by freshly burnt gasses coming in contact with them. The result is an explosion from the end of the muffler. Check to see if the baffle(s) are in good shape. If they have collapsed, they will not allow free passage of exhaust gasses, therefor causing the engine to run poorly, if at all.
A longshot, but worth the check!

[plkmonster2]

Hey Mobular, Which baffles do you mean? Like the spark arrestor? I'll check that, thanks. So the back fires won't hurt the valves will they? I hope not. I never knew that is where a backfire happened, thanks for informing me. As for my weak spark, I tore my left case off in a mad frenzy. I find oil all over the stator. I think this is normal, but then I got a few Ohm readings. The brown and black wires yielded 277 ohms, and the red stripe and green stripe wires came up to 208 ohms. I spun the motor over, and got an average of 6volts coming from the brown and black wires, this was in DC mode. Do those Ohm readings seem low? I thought they would be more in the 300 range? Thanks everyone!

EDIT: Also, about ohm readings, they get me all mixed up... One question, so they higher the number, the higher resistance? So say a light bulb should have a very high ohm reading, and then a small piece of wire should have a low reading? Thanks everyone!

[Mobular]

Yes, spark arrestor and other innards of the muffler. As for electrical, sorry, it's my weak area!

[plkmonster2]

I checked the muffler, but I can't see anything wrong. The dumb thing is all rotted through... Should try to get another. BTW, Howdy, if you see this, I was wondering if you have a spare stator and a voltage Regulator?

[TimSr]

I dont see any way possible a backfire could cause electrical problems, and would think it unlikely to cause mechaincal problems, but Mobular's theory on possible muffler problems makes sense. I once had one split from a backfire. For test purposes, just take the muffler off and try it.

[plkmonster2]

I think the spark was weak to begin with, but I want to fix it... I'll go check the silencer out further, but one problem is that I can't take it off, because when I got it, the muffler and silencer were welded together...

[plkmonster2]

I'm thinking of just cutting off the silencer, and welding it back on, or getting a coupler. Also, why would it pop a lot, like a small backfire, when I was riding around after the backfire? It seems like a whoosh sound too, that puts out a lot of air out the exhuast. To me, it seems like the spark is shutting off, and then getting gas in the exhuast, and then it starts to fire again.

[threewheelin-feelin]

sounds like a weak coil to me my 200s did the same thing and the coil was weak

[plkmonster2]

I've tried a new coil, but no go... I'm gonna try the stator..

[smokinp]

try removing the exhaust system and then start and if it runs then you know it is the exhaust.

[firebird13601]

Check your flywheel key otherwise known as a woodruff key

[plkmonster2]

I'll try runing with no exhuast, but will it hurt it? Also, I've checked the woodruff key, and it's still there, and in its spot. I'm gonna get a new stator, since it needs one, and start from there.