Fixing A Yamaha 2 Stroke Rpm Youtube Diagnosing why your 2 stroke outboard isn’t hitting full rpm can be a step by step process. follow these diagnostic steps systematically: visual inspection: start with a visual inspection of your engine and its components. look for loose connections, disconnected hoses, or obvious damage. 6. jul 22, 2011. #1. hey, i bought a bass boat with a 90 hp yamaha 2 stroke. took it out and ran great for maybe 2 min, then sputtered down. seems to run good at low rpms but when throttle is applied over 2000rpms it wont accelerate and seems to run ruff like its cutting out. i replaced fuel line, cleaned carbs, changed plugs, tried choking.
115 Yamaha 2 Stroke Diagnosis Fix Step By Step Boat Engine Repair A loss of power in a 2 stroke outboard engine at full throttle can be caused by issues like a dirty or clogged carburetor, fouled spark plugs, damaged reed valves, an incorrect fuel to oil mixture, or a clogged fuel filter. regular maintenance and troubleshooting can help identify and rectify these issues. I have a 1989 yamaha 50hp, 3 cylinder, 2 stroke (6h5 l 511690 d) which starts straight away but will cough and die after about 30 seconds as seen in the first video. after the carburetor link adjustment the engine will idle for a bit longer as in the second video and it is similar at low rpm where it seems to be misfiring. Aug 24, 2010. #3. re: 50hp yamaha 2 stroke low rpm at wot. it's mounted on an alumacraft classic 165 cs. 16' 5". this is a very common setup sold at several different dealerships in the area. i can run roughly 3k rpm with just myself in the boat or with two other people and a 70lb dog on top of that. 11,195. oct 1, 2003. #8. re: max rpm on 90 hp! 2 stroke yamaha. lugging is when your motor should be turning a higher rpm for given conditions. if you underprop your motor, it will always be working harder at all speeds. kinda like trying to climb a steep hill in 4th gear of a manual transmission car.
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