Sparks off the chain?????? That's a new one!
Are we talking electrical or friction sparks? very possible your pulling motor ground through the chain.
For experimentation, run a wire from the negative side of battery to one of the starter mounting bolts and see how the motor cranks . If an improvement , you need a dedicated ground wire to the motor case
There is a dedicated ground connection in the wiring system. Most of the time one of the upper front CVT cover bolts is used for this connection. If the CVT cover is removed this connector has to be installed with that bolt when the cover is reinstalled. A lot of folks neglect to connect this wire back on or it gets broken. I always run this wire over to one of the starter bolts. It makes a solid connection right at the starter and I don't have to fiddle with it every time I take the cvt cover off.
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