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Grey smoke can be cooling liqued. Blue grey smoke can be oil. Does the bike use oil. One of the problems of the vn1500 is bad pistons or piston rings. Measure the compression of the cylinders front cylinder 50 - 85 psi bij 300rpm. rear cylinder 110 - 156 psi at 300rpm the differance between front and rear is the KACR mechanism that reduces the compression of the front cylinder during cranking.

If the compression is not good the pistons or piston rings are bad. or the valves are worn out or leaking. Leaking can be the result of to much carbon on the valves.

You said that the sparkplugs were oil soaked. That is the reason i give you this advice

The dutchman
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