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87 fourtrax 70 no spark

18630 Views 7 Replies 6 Participants Last post by  TJeff, 
G
Picked up a fourtrax 70 for the kids yesterday. Needless to say they are more than anxious to get going but no spark. I cleaned up all the grounds and checked and cleaned connections. The grounds and kill switch seems to funtion ok. Key was eliminated wires are just connected together. How can I tell if there is power to the coil? What would be the first place to start on this problem cdi, stator, pulse generator? I pulled the side cover but didn't have a flywheel tool so thats still on there. It was suprising clean inside no rust. So are the aftermarket coils and CDIs for sale on EBAY junk or will they work.
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TRX2fiveO
I ran into this problem a couple of months ago with the same quad model and year.. First of all I relocated the groung from the bottom air cleaner housing bolt to the frame. I sanded all the paint from the area and connected it there. I then unplugged the CDI cleaned the contacts as best i could and coated them with Die-electric grease I reinstalled them and I had fire. I would clean all your connections again....

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