Larson SEi 180 Fish Series I/O 2005 vs Larson Senza 186 I/O 2011 - Boat Spec Comparison

Q: Which is easier to trailer — the Larson SEi 180 Fish Series I/O 2005 or the Larson Senza 186 I/O 2011?

For trailering, the Larson Senza 186 I/O 2011 has the edge at 27 lbs dry weight versus 265 lbs for the Larson SEi 180 Fish Series I/O 2005. 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 Senza 186 I/O 2011 has a documented max rating of 270 hp. Engine specifications for the Larson SEi 180 Fish Series I/O 2005 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 Fish Series I/O 2005 is Coast Guard rated for 6 passengers, while the Larson Senza 186 I/O 2011 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 I/O 2011 measures 94" wide, compared to 93" for the Larson SEi 180 Fish Series I/O 2005. 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 Fish Series I/O 2005 or the Larson Senza 186 I/O 2011?

The Larson Senza 186 I/O 2011 has the bigger tank at 29 gallons, versus 23 gallons on the Larson SEi 180 Fish Series I/O 2005. 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 Fish Series I/O 2005 and Larson Senza 186 I/O 2011 from the same manufacturer?

Yes — both the Larson SEi 180 Fish Series I/O 2005 and the Larson Senza 186 I/O 2011 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 Fish Series I/O 2005 vs Larson Senza 186 I/O 2011

Larson

Larson SEi 180 Fish Series I/O 2005

2005

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Larson

Larson Senza 186 I/O 2011

2011

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Detailed Evaluation & Buyer Recommendation

Larson SEi 180 Fish Series I/O 2005 vs Larson Senza 186 I/O 2011 — Same Brand, Different Boat

The Larson SEi 180 Fish Series I/O 2005 vs Larson Senza 186 I/O 2011 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 Senza 186 I/O 2011 tops out at 270 hp. Engine specs for the Larson SEi 180 Fish Series I/O 2005 aren't listed — confirm with a dealer before selecting an outboard.Fuel capacity breaks the other way: the Larson Senza 186 I/O 2011 carries 29 gallons versus 23 gallons in the Larson SEi 180 Fish Series I/O 2005. 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 I/O 2011 is rated for 9 passengers, while the Larson SEi 180 Fish Series I/O 2005 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson Senza 186 I/O 2011 could be the deciding factor.

Bottom line: Choose the Larson Senza 186 I/O 2011 if your priority is putting more people on the water — it handles 9 passengers and at 18,5 ft it has the deck room to back that rating up comfortably. The Larson SEi 180 Fish Series I/O 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.

General Boat Info

MakeLarson

ModelSEi 180 Fish Series I/O

ModelSenza 186 I/O

Model Year2005

Model Year2011

Measurements / Dimensions

Beam7 ft. 9 in

Beam7 ft. 10 in. (2.39 m)

Beam - Meters2.36

Beam - Meters2.39

Beam - Inches93

Beam - Inches94

Deadrise21℃

Deadrise21°

Draft [max] - Detail31 in. max

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

Draft [max] - Meters0.79

Draft [max] - Meters0.84

Draft [max] - Inches31

Draft [max] - Inches33

Weight - Detail2,650 lbs. apx

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

Weight - kg1202.02

Weight - kg1224.7

Weight - lbs.265

Weight - lbs.27

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 - Feetnot available

Length - Feet18.5

Body / Hull

Hull materialFiberglass

Hull typenot available

Hull typeModified Vee

Engine and Drivetrain

Fuel tank capacity - Detail23 gal

Fuel tank capacity - Detail29 gal. (110 l)

Fuel tank capacity - Liters87.06

Fuel tank capacity - Liters109.78

Fuel tank capacity - Gal23

Fuel tank capacity - Gal29

Engine/s standardnot available

Engine/s standardMerCruiser 4.3L

Fuel typenot available

Fuel typeGas

Drive typenot available

Drive typeI/O

Horsepowernot available

Horsepower190 hp

Engine maxnot available

Engine max270 hp

Operational Info

Maximum capacity1,100 lbs

Maximum capacity1,400 lbs. (635 kg)

Maximum people6 Persons

Maximum people9

Trailer Info

Trailer - Detailnot available

Trailer - DetailSZA 3400 DB with swing tongue

Trailer - Length over allnot available

Trailer - Length over all25 ft. 1 in. (7.64 m)

Larson SEi 180 Fish Series I/O 2005 vs Larson Senza 186 I/O 2011 — Common Questions

Which is easier to trailer — the Larson SEi 180 Fish Series I/O 2005 or the Larson Senza 186 I/O 2011?

For trailering, the Larson Senza 186 I/O 2011 has the edge at 27 lbs dry weight versus 265 lbs for the Larson SEi 180 Fish Series I/O 2005. 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 Senza 186 I/O 2011 has a documented max rating of 270 hp. Engine specifications for the Larson SEi 180 Fish Series I/O 2005 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 Fish Series I/O 2005 is Coast Guard rated for 6 passengers, while the Larson Senza 186 I/O 2011 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 I/O 2011 measures 94" wide, compared to 93" for the Larson SEi 180 Fish Series I/O 2005. 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 Fish Series I/O 2005 or the Larson Senza 186 I/O 2011?

The Larson Senza 186 I/O 2011 has the bigger tank at 29 gallons, versus 23 gallons on the Larson SEi 180 Fish Series I/O 2005. 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 Fish Series I/O 2005 and Larson Senza 186 I/O 2011 from the same manufacturer?

Yes — both the Larson SEi 180 Fish Series I/O 2005 and the Larson Senza 186 I/O 2011 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 Fish Series I/O 2005 full specs ← Larson Senza 186 I/O 2011 full specs