My oil tank is in the garage right next to my scrap pile. The 2.5 MERC's have a plastic 2 piece crank gear that drives the oil injection pump. These gears are very well known to fail if you bring the engine off idle before it's up to temp. The 3.0L MERCS have the same basic system that the YAMAHA's and SUZUKI's had. They were pretty reliable, but the 2.5's were not the best. MERCURY changed the platic gears out sometime around 99-00 for a bronze gear which helped out alot. Which 200 do you have? The 20o was availible in either a 2.5L or 3.0L. IIRC the 200HP BLUEWATER was a 3.0L, the OFFSHORE series was a 2.5L.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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