johnson fast strike powerhead

[fyshbone69]

Hi, looking for a power head that will fit a 150hp johsonon fast strike, lower unit good. 3 cylinder are scorched. Any help wold be great

[James R]

From what I can see there are not too many loose fast strike powerheads around.
I am rebuilding a 93 Fast Strike that also has three cylinders bad. The bad are on the port side. The Starboard side are great showing cross hatching from original. Inspection only revealed that the carb flanges were leaking on the port. The starboard was sealed good. My conclusion is the the port side was running lean. Crankshaft and bearings look good. Block in for boring and honing now.
Which cylinders failed on your motor?

[fyshbone69]

right side,left compression checks good, lots of scarring on right, everything else is good

[James R]

Have you pulled the carbs.The flanges, carb to intake, were wet with oil/fuel on the bad side. The good side was completely dry leading me to conclude that the bad side was letting air in and leaking the fuel/oil mixture.