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Let us know how those caps hold up once you get the motor running as I notice they are rated at 400 VDC with no AC rating instead of 850 VDC/400 VAC like the Vishay axial caps I’ve been using. The given applications are slightly different to.
The reason I’m asking is because I tried different types of caps before the Vishay’s and they didn’t hold up very well. They seemed fine at first with great spark but after running them for a short time and testing them, the uF ratings were all over the map. I don’t think they could handle the voltage spikes generated in the coils. I think it was Jeff R. who worked with Digi-Key to come up with caps which would work well with magneto ignitions.
https://www.digikey.ca/products/en?keywords=%20P12106-ND
https://www.digikey.com/products/en?vendor=0&keywords=bc2609-nd