ive got a 75 hp chrysler outboard ,,its lost its fire ive changed coil,power box, plugs ,rotor button nothing?

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i do makes a difference , its got power to the coil but nothing after that,, I'm at a loss any suggestions would be a big help. The reason i don't take it to the shop is ,,,there is only 2 shops in my area and they are both 35 mile away and they are booked up till late summer
the power box was off another blown motor,,used