Johnson B-series Mystery Puking A Milkshake

[JDusza]

I have no model number. It is a straight 4, fuel injected 4-stroke from somewhere in the 2000s, supposedly 115 hp. The coin on the engine says 25 024232.
Bottom cylinder puking a milkshake.
I'd like to pull the cylinder head to inspect gasket and aluminum. The instructions and videos I see say to pull the power head off the leg.
Do I really need to pull the power head to remove the cylinder head?
I have the intake out of the way and cylinder head bolts removed but the head still will not fall off. Are there hidden bolts or pins coming up through the bottom of the head?
Thanks,
J
p.s., allow me to add that I have removed the power head bolts (I believe 2) that come up through the bottom to capture the cylinder head.

 

[Crosbyman]

if the cyl head bolts are out try a narrow blade on the cyl head / PH joint location to split the cyl head from the PH .


CHAT GPT reply
Yep — that description (inline-4, fuel-injected, 4-stroke, ≈115 hp from the 2000s) matches a family of popular outboard engines from the 2000s. Below I’ll list the most likely candidates, the quick identifying specs and a few useful notes so you can narrow which one you’re dealing with.

Likely engines (straight-4, EFI, 4-stroke, ~115 hp)​

1. Yamaha F115 (1.8 L inline-4) — 1.8-liter I-4, DOHC, 115 hp @ ~5,500 rpm, fuel-injected, lightweight for its class (~377 lb dry). A very common mid-2000s Yamaha offering and a good bet if the cowling/decals say “F115” or “Yamaha”. yamahaoutboards.com+1
2. Honda BF115 (2.35 L DOHC I-4) — 4-cylinder DOHC 16-valve, 2,354 cc, rated 115 hp @ ~5,250 rpm, multi-port programmed fuel injection, known for Honda’s automotive-style engineering (BLAST™ acceleration on some models). Look for “BF115” on the cowling. marine.honda.com+1
3. Suzuki DF115 (in-line 4, MPI EFI) — Suzuki’s 115 is an inline-4, 4-stroke with multi-point sequential EFI (various cc values depending on year/design), typical full-throttle range 5,000–6,000 rpm. Suzuki decals or model code like “DF115” is a clue. Suzuki Marine Australia+1
4. Mercury 115 (FourStroke / Pro XS 115 variants) — Mercury has a 115-hp inline-4 FourStroke in that era (≈2.1 L in some generations), EFI, common weight and charging specs similar to competitors. Look for Mercury model codes like “115EXLPT”, “FourStroke 115”, or “Pro XS 115”. boatspecialists.com+1

How to identify which one you have​

• Check the cowling for model/brand decals (e.g., F115, BF115, DF115, “115” with Mercury badge).
• Look on the engine plate (usually under the cowling or on the transom bracket) for the model number / serial — that will tell the exact year and variant.
• Note displacement (if stamped or in paperwork): ~1.8 L → Yamaha; ~2.35 L → Honda; ~2.1 L → Mercury; Suzuki commonly 1.5 L – 1.9 L depending on gen. The full spec pages above show exact displacements.

 

[flyingscott]

Suzuki built 115 hp, get the factory manual to help.