engine swap

[flaneledholes]

hello first post here.
so bought a taotao cy-t3 with a blown 139qmb and a spare 139qmb. My question is the spare engine wont start. Not even with starting fluid. It is getting spark but is weak. I noticed the magneto wiring is different. Just wondering if I should swap then out to see if that helps? The spare engine emissions looks a bit different bit is the same theoretically. And the magneto has an extra wire. Now it still produces spark even without the extra wire I'm just wondering if it is messing with it by being different? I know I'm all over the place and its hard to understand my question but please do your best. Thanks

matt