I need help! I have a 1979 Johnson Javelin 100 Hp (100tlr79s) that no matter what I do it will not get above 4000 rpm at wot. Spark on all cylinders will clear a 7/16 air gap with blue spark.
Compression is as follows...
#1 120
#2 119
#3 119
#4 120
Here's what has been done so far...
1. Total carb disassembly, cleaned, 4 new 50c high speed jets installed, floats are dead level( checked with caliper to make sure),new floats,needle and seat.
2. Checked wot timing (using Jim Reeves method) dead on at 24 degrees.
3.Installed 2 new power packs. ( 1 was having intermittent firing issues on cyl. #3 so changed both)
4. New fuel lines from tank to carbs.
5. Temps sensors unhooked to check for slow speed engaging.( no change).
6. Changed from a 12 3/4 x 23 prop to a 13x19 (Helped some but still 4000 rpm max)
7.decarbed the pistons and rings using the seafoam in a gallon of gas method.
8. Link and sync using Evinrude/Johnson shop manual (48-235 hp / 1973-1989)
This engine will idle all day long at 650 rpm and throttle response is smooth and sure and boat will jump out of the water like a shot cat. But from all the research I have done this engine won't be at peak performance until 5000-5500 rpm is this correct? And is there something I have missed or failed to check?
Compression is as follows...
#1 120
#2 119
#3 119
#4 120
Here's what has been done so far...
1. Total carb disassembly, cleaned, 4 new 50c high speed jets installed, floats are dead level( checked with caliper to make sure),new floats,needle and seat.
2. Checked wot timing (using Jim Reeves method) dead on at 24 degrees.
3.Installed 2 new power packs. ( 1 was having intermittent firing issues on cyl. #3 so changed both)
4. New fuel lines from tank to carbs.
5. Temps sensors unhooked to check for slow speed engaging.( no change).
6. Changed from a 12 3/4 x 23 prop to a 13x19 (Helped some but still 4000 rpm max)
7.decarbed the pistons and rings using the seafoam in a gallon of gas method.
8. Link and sync using Evinrude/Johnson shop manual (48-235 hp / 1973-1989)
This engine will idle all day long at 650 rpm and throttle response is smooth and sure and boat will jump out of the water like a shot cat. But from all the research I have done this engine won't be at peak performance until 5000-5500 rpm is this correct? And is there something I have missed or failed to check?
