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Post by twitch on Dec 22, 2007 12:52:06 GMT -5
I have had an issue with my bike not starting within about 30 to 45 minutes after I shut it off. I had originally thought this was a fuel issue, so I swapped out carbs. It seemed to work fine...for about 3 days, now its back to its old habit. I picked up an inline spark tester and discovered that when its not starting, its not sparking. This has me stumped since, by my way of thinking, a coil or a CDI is not going to be broken one minute and fix itself the next. Please let me know what you guys think. I am open to any and all ideas. My next step is just to start replacing things until it works.
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Post by fulltimerart on Dec 22, 2007 13:02:34 GMT -5
 How about a fuel line too close to a heat source (sorta like vapor lock)----maybe a pinhole in the vacuum line to the fuel valve----or a loose ground on the CDI---even a weak battery that doesnt have enough voltage when hot. Just my 2 cents worth. Art
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Post by twitch on Dec 22, 2007 13:15:29 GMT -5
I have adjusted the fuel line every possible way it can be to avoid being near heat, so I feel like that is the least likely. I have bypassed the vacuum valve, and the vacuum line from the intake to the carb is solid. I can pull it off and block one end off and blow with all my might and no leak. The ground on my CDI is along the lines I was thinking, except I dont see how waiting 30 minutes would make it better. As far as the battery goes, if it has juice to turn the motor over, shouldnt that be enought to provide spark?
Please dont think i am simply writing off you suggestions, but i am trying to address all suggestions as they are presented. Kind of proccess of elimination.
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Post by Enviromoto on Dec 22, 2007 14:07:19 GMT -5
sounds like the coil to me.
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Post by funderp47 on Dec 22, 2007 19:14:45 GMT -5
I suppose you tried the inline spark tester when it was firing to know the tester's ok? If so, and it doesn't spark when it stops running, then it seems you have the problem pinned down to the ignition system.
The wire that goes to the ignition and kill switch is grounded to kill the cdi. It is generally black with a white stripe. If you remove that wire at the cdi, it should run and you can't make it stop until it's reconnected. If you disconnect it, spin the engine and have no spark, then it's time to test from the cdi to the stator.
Go to one of swampsniper's posts, click on the links at the bottom of his posts, to read more about how to do that. Proper troubleshooting can avoid buying needless parts. Good luck.
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Post by swampsniper on Dec 22, 2007 20:54:45 GMT -5
Put some crushed ice in a plastic bag. When you have a no spark situation chill the CDI or the coil, and see what happens. Do them one at a time.
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Post by twitch on Dec 25, 2007 17:30:05 GMT -5
Thanks for all the suggestions folks. I will let you know what bacomes of it. Happy Holidays to everyone here. ;D
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Post by stewntexas on Dec 25, 2007 19:18:38 GMT -5
As silly as it sounds, I would follow the suggestion of trying a bag of ice. Just a small resealable bag should do the trick. Be sure to hold it on the CDI.
It sounds like a thermal problem. When it gets hot, it expands breaking the connection. Conversely, when it cools it shrinks.
If testing in this manner you get spark, I would remove all wires/plugs to the unit, clean them with sandpaper/an old nail file from your S.O. (remember, be PC in all things). Clean everything you can find that may carry current.
If this works, you know the CDI is bad, or you had a bad connection.
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Post by twitch on Dec 27, 2007 18:56:57 GMT -5
I had the same old problem today in my driveway, so I grabbed a bag of ice. I first tried the coil with no results. Then i tried the CDI. BINGO!! It fired up after about 30 seconds with the ice pack on it. I wanted to make sure that the coild was totally out of the equation so I waited an hour and fired her up and went for a cruise around the block with the ice in tow.
She actually stalled on me (one of only 4 times in 2500miles) and would not start back up. Right away i grabbed the ice from under the seat and placed it on the CDI. Sure enough within 1 minute she fired right back up.
I feel like this points to the CDI without a doubt. I have cleaned the connections before so i doubt thats it, but i will check them again. If I cannot find any obvious issues with the connections, I am going to buy a new CDI and hope thats the fix. If you think i have overlooked anything or went about this in the wrong way please let me know. I really dont want to buy parts that I dont need to.
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Post by scooterollie on Dec 27, 2007 19:59:23 GMT -5
Twitch;
Sounds like "Stewntexas's" idea and your followthrough produced good results. Great suggestion for others!
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Post by Enviromoto on Dec 27, 2007 21:05:15 GMT -5
Nice tip, I will be keeping this in mind.
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How about a fuel line too close to a heat source (sorta like vapor lock)----maybe a pinhole in the vacuum line to the fuel valve----or a loose ground on the CDI---even a weak battery that doesnt have enough voltage when hot. Just my 2 cents worth. Art
