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Murray here are some great articles on capacitirors guts, testing and repairs
https://wrcoutboards.org/wp-content/uploads/2020/04/Part1_Condenser_Construction_Failure_Modes.pdf
https://wrcoutboards.org/wp-content/uploads/2020/04/Part3_Sizing_Condensers_Correctly.pdf
https://wrcoutboards.org/wp-content/uploads/2020/04/Part4_Repairing_Broken_Condensers.pdf
small voms analog or digital meter with small internal batteries ( 3-9v usually) don’t have egough punch to test leakage between capacitor foils.
they may be fine for tesing OPEN or SHORTs or .uf values but they are not effective to test HV leaks which will mess up ignition on OBs
as you read the excellent articles you will find that older OBs need a bit bigger capacitors
if ever you wish to build a basic capacitor tester….. here is a simple layout. if the neon bulb shines the capacitor is bad..simple!
Mr.Mohat offers alternatives …..also excellent but a bit more elaborate. I built his basic model #1 and it works wonderfully for testing caps. Just write to him for his design #1 schematic
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