1984 evinrude 235 running smooth at 5000 rpm,stopped no noise or anything,fired right back up but wouldn't get over 4000 rpm,checked compression when got home 100lbs on all cyl except bottom right had 50lbs,any ideas,please
1984 evinrude 235 running smooth at 5000 rpm,stopped no noise or anything,fired right back up but wouldn't get over 4000 rpm,checked compression when got home 100lbs on all cyl except bottom right had 50lbs,any ideas,please
Time for a tear down oversize the cylinder to .030 and put in new piston set and needle bearings. Get a shop manual.
Before you start to tear that engine down, first try this. Remove all sparkplugs. Add some cycle 2 oil too that cylinder with only 50lbs. of compression. Let the oil stand on that cylinder over night. ( Of course with the engine tilted up). The next day , crank the engine a couple of times and then take another reading from that low compression cylinder and see if it increased back to normal.
I had a 1989 150XP, that one of the cylinders had gotten hot and the rings got stuck on to the piston causing a very low compression reading. A reliable mechanic told me to do what I just explained and the compression was back up to 105 lbs. The engine is still being used today by a friend. Try this , you have nothing to lose. Worst case you have to rebuild your engine.
The cylinder more than likely got hot from a bad H20 deflector in the H20 passage. Glad you had sucess by oiling the cylinder.
I was definitely lucky , Fred. If not , I would have a worthless 150 XP on my hands.
Ain't now such thing as a worthless motor.
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