posted 10-15-2003 01:03 PM ET (US) Nick has pretty much covered these motors but let me summarize and add a few comments.
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Download 2005 Johnson Outboard 30hp 4 Stroke Pn 5005992 Service Manual 488.
The SPL or 'Special' line of OMC outboard motors were merely non-VRO versions of the recreational line of outboards. They were meant to be sold for less money because they had fewer bells and whistles. In fact, the original V-4 SPLs did not even have trim and tilt but because this feature had become so ubiquitous by the late 1980's OMC added this feature back into the SPL line. So it was really just the lack of VRO that distinguished them.
The odd horsepower ratings (e.g. 48 hp, 88 hp, 112 hp, ect.) were merely changes in horsepower ratings; they were not actually de-tuned in any way. An 88 SPL is exactly as powerful as its 90 hp sibling. This was an strange marketing strategy aimed in part to assure the buyer of a 'normal' recreational model of outboard that they were getting a little more for the extra money they were paying.
The SPL line should not be confused with the Commercial line of outboards that OMC produced. OMC manufactured a beefed up line of outboards that generally saw lower horsepower ratings than the recreational models they were based on. For example, the V-6 Commercial was rated at 155 hp. The 'big bore' V-4 was rated at 100 hp instead of the normal 120 and it was fitted with an extra large gearcase borrowed from the V-6 models. (As an aside, some of the 'big bore' recreational 140 hp V-4s were also fitted with the larger gearcase.)
The Commercial line of outboards also had more stainless steel fasteners and a heavy duty water pump. As a bonus one got especially unattractive paint and labels too.
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