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First time poster here, I just got into these bikes and haven't really been browsing forums for them much. I have a 93 650 just picked up to ride while my 86 is in the shop getting top end done. It started out great ran ok but it would occasionally just die when it was idling. It never ran rough never misfired or anything of that nature. So we were riding it today I turned a corner and it just quit and can't get it to fire up again. Checked spark thats good, its getting fuel, it wouldn't even fire when we sprayed carb cleaner in it. Now I have not replaced the spark plug yet as I'm hard up for a socket that'll fit down in there. My question was would a fouled plug do that? Like I said it wasn't running rough or missing just sometimes at idle it would cut out. Any ideas?
 

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I've had mostly good luck with plugs but during break-in on my '68 Beemer a Bosch pug simply stopped firing after about 500 miles. The NGK's have been fine for almost 7000 miles.
Wouldn't hurt to check it at the plug for spark and replace. Don't know about a '93, but my 2002 came with a socket in the toolkit.
 

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If it was cutting out dead at idle it certainly sounds like an electrical thing. It would be good to have a look at the plug to see what kind of shape it's in. There's a plug wrench in the factory tool kit if you have it for either bike.
 

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Discussion Starter #4
ya sadly i don't have the toolkit on either bike i just need to work on getting that plug out i guess my sockets are all too big
 

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turn off the lights

Check your coil boot. Mine was bad and arcing to engine instead of firing the plug. I only found out because while riding at night my buddy saw the spark arcing while I was idling next to him. Check it out could be as simple as that.
 

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spark, air, and fuel = combustion. you have to missing one of them. please expand on 'has spark', 'getting fuel'. even if your plug is fouled you should get intermitent combustion (sputtering) as long as your voltage is ok (try a fresh battery). its possible that your coil is crap, but again if you are getting spark you should get some combusion. plugs are cheap and u need a spare anyway :). where have you determined there is fuel? check fuel delivery in the carb. drain the float and see if there is fuel in there. then turn the tank back on and choke and crank a bit. then check the bowl again. carb cleaner does not burn well at all as a fuel, try starter fluid much better combustion. (if you spray carb cleaner in a running engine it will falter, starter fluid and it will run faster). float may be stuck in the carb? possibly plugged idle jet. might be worth pulling off after checking a couple things. if yo have glass fuses change them all even if the look good (dont ask how long it took me to track down a bad fuse that looked good and tested good but failed under load). fresh gas? my $.02
 
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