- Serial number labels will reference the date of manufacture for the engine by providing visibility of the month and year the engine was produced. For example, if an engine was manufactured in May of 2012, the serial number label will reflect 05/2012 directly below where the serial number is indicated.
- Numbers, Numbers. Prior to 1969, Johnson model numbers were year-specific; serial numbers were used in identification. Johnsons from the 1969 to 1979 era use the last two digits of the year at the end of the model number to identify the model year; for example, a Johnson model number ending in '-4RL79' was built in 1979.
- Numbers, Numbers. Prior to 1969, Johnson model numbers were year-specific; serial numbers were used in identification. Johnsons from the 1969 to 1979 era use the last two digits of the year at the end of the model number to identify the model year; for example, a Johnson model number ending in '-4RL79' was built in 1979.
- Johnson Outboard Serial Number Lookup
- Johnson Outboard Serial Number Decoder
- Johnson Motor Serial Number Year
#1) Hi can anyone help me with year and model number of 25hp Evinrude motor. All I have is serial number as follows: 5520 52402 #2) Can electric starter be added to this motor? Any info would be greatly appriciated.
Johnson Outboard Serial Number Lookup
The J4C replaced the J4J, Binkie. If you can find J4J plugs, they will work fine. The J4C is improved, though. The recommended gap has changed back and forth from .040' to .030'. Current recommendation is .030' for all purpose use and .040' for extended trolling. Many users go to .035' for mixed applications.TC-W3 outboard oil is far superior to 30W automotive oil for any carbureted 2 stroke outboard. Far less smoke and carbon residue and far less plug fouling.
OMC called for 24:1 fuel mix up until 1964 and 50:1 for 1964 and later models. The change wasn't due to the introduction of TC-W outboard oil, it was the changeover to 'frictionless' (ball and needle) bearings in most OMC outboards.
Johnson Outboard Serial Number Decoder
The JW and JH series didn't complete that changeover until 1970. My trusted expert friends recommend 24:1 with TC-W3 certified oil in JW and JH series engines made before 1970.
Johnson Motor Serial Number Year
It is rare that small engine gurus recommend overriding manufacturer recommendations. This is one case. Another case is the manufacturer recommendations of a 100:1 fuel mix on several small engines made in the 1980s. After experiencing some corrosion in the crankcase of engines stored for extended periods OMC revised their spec to 50:1, but only after the specialists in the field made the switch on all '100:1' small engines.