Larson SEi 180 O/B 2004 vs Larson Senza 186 2009 - Boat Spec Comparison

Q: Which is easier to trailer — the Larson SEi 180 O/B 2004 or the Larson Senza 186 2009?

For trailering, the Larson SEi 180 O/B 2004 has the edge at 15 lbs dry weight versus 27 lbs for the Larson Senza 186 2009. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.

Q: What is the maximum horsepower rating for these boats?

The Larson SEi 180 O/B 2004 has a documented max rating of 150 hp. Engine specifications for the Larson Senza 186 2009 were not available in our database — check the OEM spec sheet or manufacturer's website for confirmation.

Q: How many people can each boat hold?

The Larson SEi 180 O/B 2004 is Coast Guard rated for 5 passengers, while the Larson Senza 186 2009 is certified for 9. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Q: Which boat is wider, and does it affect trailering?

The Larson Senza 186 2009 measures 94" wide, compared to 93" for the Larson SEi 180 O/B 2004. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Q: Which boat has the larger fuel tank — the Larson SEi 180 O/B 2004 or the Larson Senza 186 2009?

The Larson Senza 186 2009 has the bigger tank at 29 gallons, versus 23 gallons on the Larson SEi 180 O/B 2004. That 6-gallon difference translates to roughly 18–30 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Larson SEi 180 O/B 2004 and Larson Senza 186 2009 from the same manufacturer?

Yes — both the Larson SEi 180 O/B 2004 and the Larson Senza 186 2009 are built by Larson. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

Boat Comparison

Larson SEi 180 O/B 2004 vs Larson Senza 186 2009

Larson

Larson SEi 180 O/B 2004

2004

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Larson

Larson Senza 186 2009

2009

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Detailed Evaluation & Buyer Recommendation

Larson SEi 180 O/B 2004 vs Larson Senza 186 2009 — Same Brand, Different Boat

The Larson SEi 180 O/B 2004 vs Larson Senza 186 2009 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.

The Larson SEi 180 O/B 2004 carries a rated maximum of 150 hp. Engine data for the Larson Senza 186 2009 wasn't available in our records — check the manufacturer's spec sheet before sizing a motor.Fuel capacity breaks the other way: the Larson Senza 186 2009 carries 29 gallons versus 23 gallons in the Larson SEi 180 O/B 2004. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

For family outings this is probably the sharpest distinction between the two. The Larson Senza 186 2009 is rated for 9 passengers, while the Larson SEi 180 O/B 2004 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson Senza 186 2009 could be the deciding factor.

Bottom line: Choose the Larson Senza 186 2009 if your priority is putting more people on the water — it handles 9 passengers and at 18,0 ft it has the deck room to back that rating up comfortably. The Larson SEi 180 O/B 2004 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.

General Boat Info

MakeLarson

ModelSEi 180 O/B

ModelSenza 186

Model Year2004

Model Year2009

Measurements / Dimensions

Beam7 ft. 9 in

Beam7 ft. 10 in. (2.39 m)

Beam - Meters2.36

Beam - Meters2.39

Beam - Inches93

Beam - Inches94

Deadrise21℃

Draft [max] - Detail30 in. max

Draft [max] - Detail33 in. (83.8 cm)

Draft [max] - Meters0.76

Draft [max] - Meters0.84

Draft [max] - Inches3

Draft [max] - Inches33

Weight - Detail1,500 lbs. apx

Weight - Detail2,700 lbs. (1,225 kg)

Weight - kg680.39

Weight - kg1224.7

Weight - lbs.15

Weight - lbs.27

Height [transom]20 in

Height [transom]not available

Length overall - Detail17 ft. 6 in

Length overall - Detail18 ft. 6 in. (5.64 m)

Length overall - Meters5.33

Length overall - Meters5.64

Length overall - Inches21

Length overall - Inches222

Length - Metersnot available

Length - Meters5.64

Length - Feetnot available

Length - Feet18

Length - Inchesnot available

Length - Inches6

Body / Hull

Hull materialFiberglass

Hull typenot available

Hull typeModified Vee

Engine and Drivetrain

Fuel tank capacity - Detail23 gal

Fuel tank capacity - Detail29 gal. (109.8 l)

Fuel tank capacity - Liters87.06

Fuel tank capacity - Liters109.78

Fuel tank capacity - Gal23

Fuel tank capacity - Gal29

Engine max150 HP

Engine maxnot available

Fuel typenot available

Fuel typeGas

Drive typenot available

Drive typeI/O

Operational Info

Maximum capacity1,475 lbs

Maximum capacity1,400 lbs. (635 kg)

Maximum peoplenot available

Maximum people9

Larson SEi 180 O/B 2004 vs Larson Senza 186 2009 — Common Questions

Which is easier to trailer — the Larson SEi 180 O/B 2004 or the Larson Senza 186 2009?

For trailering, the Larson SEi 180 O/B 2004 has the edge at 15 lbs dry weight versus 27 lbs for the Larson Senza 186 2009. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.

What is the maximum horsepower rating for these boats?

The Larson SEi 180 O/B 2004 has a documented max rating of 150 hp. Engine specifications for the Larson Senza 186 2009 were not available in our database — check the OEM spec sheet or manufacturer's website for confirmation.

How many people can each boat hold?

The Larson SEi 180 O/B 2004 is Coast Guard rated for 5 passengers, while the Larson Senza 186 2009 is certified for 9. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Which boat is wider, and does it affect trailering?

The Larson Senza 186 2009 measures 94" wide, compared to 93" for the Larson SEi 180 O/B 2004. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Which boat has the larger fuel tank — the Larson SEi 180 O/B 2004 or the Larson Senza 186 2009?

The Larson Senza 186 2009 has the bigger tank at 29 gallons, versus 23 gallons on the Larson SEi 180 O/B 2004. That 6-gallon difference translates to roughly 18–30 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Larson SEi 180 O/B 2004 and Larson Senza 186 2009 from the same manufacturer?

Yes — both the Larson SEi 180 O/B 2004 and the Larson Senza 186 2009 are built by Larson. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

← Larson SEi 180 O/B 2004 full specs ← Larson Senza 186 2009 full specs