After researching this issue several times, I'm was convinced there is no way to quiet the Suzuki V Twin beyond using a high grade synthetic. I've had two and the both hammered like diesels even with Mobil 1 and Amsoil. Today I got brave and decided to try an oil additive. I put 12 oz of Lucas Oil Stabilizer in the crankcase. This stuff is super sticky and clings to everything. I ran it for about 30 min afterwards and the bike does run a lot quieter. Not sure how long it will last. Just wondering if anyone else has tried this and if they've had any luck.
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