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Discussion Starter · #1 ·
Well i was idling my bike so it warmed up to do more checkups on the cdi when it uncharacteristically stalls flat out. Then, when I go to restart it, the starter motor spins freely the first time, before engaging the third time. A few seconds later it stalls again and so on and so forth. What did i do horribly wrong last time i pulled the rear cover. Also, could this possibly be a cause of one cylinder firing intermittently?
 

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The quality of advice ( or guesses) offered here varies in direct proportion to the

information supplied.

on such breif data. I can only offer two 'dont know's to your questions.



If you supply info on the model, year, mileage, recent work done, mods etc and any

other background info you feel is relevant this will help others make informed guesses.

your location may help as well
 

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Did you get any abrupt stops in the cranking cycle before this happened? When my CDI was on it's way out, it would throw the spark at the very wrong time while cranking, which I suspect caused the rollers in the starter clutch to dig in the flywheel. I always get positive engagement, but it sounds like amplified corn flakes getting crunched when I crank it over.



Check your battery and charging system too.
 

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Discussion Starter · #4 ·
Did you get any abrupt stops in the cranking cycle before this happened? When my CDI was on it's way out, it would throw the spark at the very wrong time while cranking, which I suspect caused the rollers in the starter clutch to dig in the flywheel. I always get positive engagement, but it sounds like amplified corn flakes getting crunched when I crank it over.



Check your battery and charging system too.


my battery's fine, but I dont see how a cdi problem would make my starter motor spin freely.
 

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Discussion Starter · #5 ·
Ok nevermind, I went back outside and haven't had any more starting problems. But while testing the bad cylinder with a sparkgap tester the spark would only jump a few millimeters in open air reliably while idling. When i revved the engine the bad cylinder stopped sparking all together. This was using brand new coils and a brand new plug cap that came with the coils. This problem also suddenly appeared in the middle of last years riding season and persisted through a carb boiling and all such stuff.
 

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my battery's fine, but I dont see how a cdi problem would make my starter motor spin freely.


When a spark is thrown at the wrong point in the ignition cycle, it can stop the engine dead in it's tracks, or even make it try to spin backwards. All that force goes directly to the starter system, and will take out the weakest link or two.



In the "good old days", you could break a leg or sprain an ankle if a bike engine kicked back on a kick starter. On antique crank start engines, it wasn't uncommon for people to die from head trauma by getting hit with the crank handle during a kickback.
 
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