Larson SEi 180 Fish Series O/B 2005 vs Larson Senza 186 I/O 2008 - Boat Spec Comparison

Q: Which is easier to trailer — the Larson SEi 180 Fish Series O/B 2005 or the Larson Senza 186 I/O 2008?

For trailering, the Larson Senza 186 I/O 2008 has the edge at 27 lbs dry weight versus 1 785 lbs for the Larson SEi 180 Fish Series O/B 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: Which boat can handle a bigger outboard?

The Larson Senza 186 I/O 2008 is rated to a maximum of 225 hp, giving it the larger power ceiling. The Larson SEi 180 Fish Series O/B 2005 tops out at 175 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

Q: How many people can each boat hold?

The Larson SEi 180 Fish Series O/B 2005 is Coast Guard rated for 8 passengers, while the Larson Senza 186 I/O 2008 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 2008 measures 94" wide, compared to 93" for the Larson SEi 180 Fish Series O/B 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: How do the fuel tanks compare on the Larson SEi 180 Fish Series O/B 2005 and Larson Senza 186 I/O 2008?

Both boats carry similar fuel loads — 29 gallons and 29 gallons respectively. Range will depend heavily on motor choice, throttle usage, and whether you're on flat lake water or coastal chop.

Q: Are the Larson SEi 180 Fish Series O/B 2005 and Larson Senza 186 I/O 2008 from the same manufacturer?

Yes — both the Larson SEi 180 Fish Series O/B 2005 and the Larson Senza 186 I/O 2008 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 O/B 2005 vs Larson Senza 186 I/O 2008

Larson

Larson SEi 180 Fish Series O/B 2005

2005

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Larson

Larson Senza 186 I/O 2008

2008

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Detailed Evaluation & Buyer Recommendation

Larson SEi 180 Fish Series O/B 2005 vs Larson Senza 186 I/O 2008 — Same Brand, Different Boat

The Larson SEi 180 Fish Series O/B 2005 vs Larson Senza 186 I/O 2008 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 power gap is worth calling out. Rated to 225 hp, the Larson Senza 186 I/O 2008 has a 50-hp advantage over the Larson SEi 180 Fish Series O/B 2005's 175-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads — 29 gal and 29 gal — so range won't be a tiebreaker here.

For family outings this is probably the sharpest distinction between the two. The Larson Senza 186 I/O 2008 is rated for 9 passengers, while the Larson SEi 180 Fish Series O/B 2005 caps at 8. 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 2008 could be the deciding factor.

Bottom line: Choose the Larson Senza 186 I/O 2008 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 Fish Series O/B 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.

General Boat Info

MakeLarson

ModelSEi 180 Fish Series O/B

ModelSenza 186 I/O

Model Year2005

Model Year2008

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] - Detail33 in. max

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

Draft [max] - Meters0.84

Draft [max] - Inches33

Weight - Detail1,785 lbs. apx

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

Weight - kg809.66

Weight - kg1224.7

Weight - lbs.1785

Weight - lbs.27

Height [transom]20 in

Height [transom]not available

Length overall - Detail18 ft. 6 in

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

Length overall - Meters5.64

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 - Detail29 gal

Fuel tank capacity - Detail29 gal. (109.8 l)

Fuel tank capacity - Liters109.78

Fuel tank capacity - Gal29

Engine max175 HP

Engine max225 hp

Fuel typenot available

Fuel typeGas

Drive typenot available

Drive typeInboard/Outboard

Operational Info

Maximum capacity1,880 lbs

Maximum capacity1,400 lbs. (635 kg)

Maximum people8 Persons

Maximum people9

Trailer Info

Trailer - Detailnot available

Trailer - DetailEZ Loader with brakes

Larson SEi 180 Fish Series O/B 2005 vs Larson Senza 186 I/O 2008 — Common Questions

Which is easier to trailer — the Larson SEi 180 Fish Series O/B 2005 or the Larson Senza 186 I/O 2008?

For trailering, the Larson Senza 186 I/O 2008 has the edge at 27 lbs dry weight versus 1 785 lbs for the Larson SEi 180 Fish Series O/B 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.

Which boat can handle a bigger outboard?

The Larson Senza 186 I/O 2008 is rated to a maximum of 225 hp, giving it the larger power ceiling. The Larson SEi 180 Fish Series O/B 2005 tops out at 175 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

How many people can each boat hold?

The Larson SEi 180 Fish Series O/B 2005 is Coast Guard rated for 8 passengers, while the Larson Senza 186 I/O 2008 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 2008 measures 94" wide, compared to 93" for the Larson SEi 180 Fish Series O/B 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.

How do the fuel tanks compare on the Larson SEi 180 Fish Series O/B 2005 and Larson Senza 186 I/O 2008?

Both boats carry similar fuel loads — 29 gallons and 29 gallons respectively. Range will depend heavily on motor choice, throttle usage, and whether you're on flat lake water or coastal chop.

Are the Larson SEi 180 Fish Series O/B 2005 and Larson Senza 186 I/O 2008 from the same manufacturer?

Yes — both the Larson SEi 180 Fish Series O/B 2005 and the Larson Senza 186 I/O 2008 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 O/B 2005 full specs ← Larson Senza 186 I/O 2008 full specs