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NEED mechanic input

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I own a xr100 2002 for a pitbike and it had been sitting in my garage for a year waiting for a tire change (im busy) and after I fixed it I went to ride it. The wheel didn't spin correctly (no big deal i nig-rigged a bearing and stuff and it ran but the chain kept popping off. After riding it easy for about 20 minutes, the chain suddenly popped off and the bike stopped. I gave it a good 100 kicks and still nothiing. So I walked it home, and drained the old gas out of the line (year old with no stabalizer), and put fresh gas in, it still didnt fire. So I bought a new spark plug and all the correct stuff for the wheel so it is good to go. The only problem is, IT DOESNT START. If anybody has experienced the same problem or someone knows what they are talking about. Please HELP me. Thanks alot! :cry::ride::thumbsup:

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Never been jetted but has ran perfectly for over 4 years, what woould a clogged carbuerator have to do with the problem if it had already been running?

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Some crap from the tank got in there. Take it apart and pull the pilot and blow compressed air through it. 9 times out of 10 that's the problem. Any spark??

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I know a guy that had a mouse build a nest in his air box on a bike that sat for a couple years. It ran for 5 - 10 min. or so before the nest got sucked into the carb. Did you look inside the air box?

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When the chain came off, did it pile up between the front sprocket and the engine cover? Did it break the case cover?

Under the case cover is the ignition pick-up. Check to see if it is broken or loose, or if the wiring for it was damaged by the chain.

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I know a guy that had a mouse build a nest in his air box on a bike that sat for a couple years. It ran for 5 - 10 min. or so before the nest got sucked into the carb. Did you look inside the air box?

now thats my kind of luck :thumbsup::ride:

I"m betting on the chain knocking off the ign pickup or the pilot jet is clogged like the previous posts say.

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dought it's the carb. I just had a simmilar problem and it was the timeing chain. It is easy to verify if you have a manual.

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I took off the alternator cover and I decided this might be the problem but I dont no what. It defentially looks like a rock broke through the cover and broke something electrical :thumbsup:

Here are the pics.. I got them off my video recorder so not the best qualitiy but any tips are appreciated.. Thanks btw for the helpful posts.

http://community.webshots.com/photo/2981716690094052070sunESM

http://community.webshots.com/photo/2527836710094052070shHzoy

http://community.webshots.com/photo/2668514280094052070OddvRH

http://community.webshots.com/photo/2161943050094052070Aqmfvf

http://community.webshots.com/photo/2496548570094052070tEjKfe

http://community.webshots.com/photo/2228847670094052070EAAbuv

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Test for a spark by taking out the plug and holding it to something metal on the bike while you kick it. Make sure you dont slip off the metal right before you kick it... :thumbsup:

Since the bike had been sitting, clean out your carb, because it is very likely something is gummed up, whether it is the cause of this problem or not. I usually get a dip kind of carb cleaner, and just soak the entire carb in it for about 5 minutes. If I can only get the spray kind, I just spray a bunch of it into a can (in a well ventilated area :ride:) until it pools up, then dip it in that.

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I don't see any damage to the electrickery. I'll go along with carb trouble.

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Oh BTW, you need to make sure it doesn't throw the chain again. Next time you could be paying for a whole new motor.

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Hard to tell from the fifth pic but make sure the pick up is located properly. The side without the bolt locates on a pin. NOT the big pin that is obvious in the pic.

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YES the pick-up got knocked off - -- - See Here:

2496548570094052070tEjKfe

That could be a big oooops or you could unbolt it and put back right and everything is OK. Either way, there's the problem. Or at least one of them. It moved farther away and now it not firing.

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