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So a friend of mine has a 2003ish eiger 400 4x4 that was running one day, and the next morning wouldn't start. I figured it was just a carb issue, so I cleaned the carb, and still wouldnt start. I have a big bear 400, so comparing to the pull start on that, the eiger seemed low on compression. I checked the valves, and the clearances were a little tight. I got them in spec and figured this would fix the problem. I was wrong. I took the carb off and sprayed starter fluid straight into the intake thinking I may have missed something in the carb and it wouldnt even hit. I pulled the plug to check the spark, and it was getting good spark. But something seemed a little off about it. What it seemed to be doing is sparking once for every stroke of the piston. Intake, compression, power and exhaust. 1234. 1234. Instead of what I'm used to with it sparking once to ignite the mixture at the top of compression and a wasted spark on the exhaust. 12. 12. The battery was really weak, so I had been jumping it off of another fourwheeler and even a car at one point through all of this. I thought there may be a shorted cell in the battery causing a problem. When you put a voltage meter on the battery and turn on the key, the voltage starts dropping fast, as in a normal counting rate, 12.50, 12.49... all the way down to 9 volts and then didnt come back once the key was off. Now when I compared this to my big bear, it did the same thing but only went to 11.98 and held there, coming back to about 12.5 volts when the key was off. So I disconnected the battery from the eiger and removed it. I then hooked jumper cables to the big bear so as to cut out the shorted battery to hopefully fix my problem. The voltage didn't drop near as quickly or as far, but the spark remained the same. The best I can figure out is as the air fuel mixture is being brought in on the intake stroke, the extra spark ignites it and it burns before it has a chance to be compressed. I got it to hit one time by spraying starter fluid in the spark plug hole while it was on the bottom of the compression stroke, so when it came up it fired. This is what lead me to believe what I said about igniting early. I'm getting pretty frustrated with the whole thing, and I've checked most everything I know how to check, so I made a profile on here to try and get some help.
 

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Discussion Starter #3
I dont have a tester that fits this plug style. But from trying to pull start it, it had the same or more than my big bear 400 that I have sitting right next to it and runs great. I can go get a tester if I really need to
 

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Compression usually doesn't disappear over night, as you've indicated it wouldn't start the next morning. I'd be tempted to swap the igniter box (CDI) for a known good one. It's possible something crapped out inside. I've hit them before with a plastic hammer and sometimes they come back to life briefly.
Hope this helps some.

Sent from my SM-G950W using Tapatalk
 

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I was kinda thinking the same thing about the CDI. I may just have to order one and see if that fixes it. Where would you suggest going after that?
 

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Yeah your probably right LTF500explorer. I didnt think about that. Its possible but unlikely. I remember having a quad that seemed to have good compression then when I stuck a tester on it I found it was way low. It's probably not worth getting a tester for it if you don't have one though. I'm not much help on the CDI, I don't have a lot of experience with those going bad but it sounds possible.
 

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Same here Masonhorse2002. I've never seen one go bad in any way so idk what to look for. I hate to order a new cdi just to find out it's fine. If no one knows anything else that it could be I will tho
 

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Thought about that too Maron. I'll probably check that before buying the CDI. I've had the rig for a while and my friend is wanting it back, so I need to try and get it running in the next few days. Thanks for the input guys. And if anyone else has any ideas let me know
 
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