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I have a 91 550 sx... and have been reading up on them. and i read in a few places not all 91s were reed valve induction..

how can i tell. it its reed valve or piston port... almost 100% sure that it is reeds... but just want to make sure. my guess.. the easiest way, is if the cylinders are black, or just a metal finish....

also curious what it is worth...
its a 91 550sx. Has WestCoast, dual carbs, exhaust, head, waterbox, mariner water grate and ride/turn plate, and believe the impeller/jet pump is also aftermarket..

ski runs great and is a blast to ride just had to replace the starter.. and now starts up with no problems...
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