Yamaha HO and SVHO Engine Specs and Review [Chart]
The Yamaha HO and SVHO are purpose-built marine engines used in Yamaha jet boats and WaveRunners. These power sources are based on the same 4-stroke, 1812cc, fuel-injected, DOHC, 4-cylinder engine, but the HO is a naturally-aspirated configuration while the SVHO is boosted with a supercharger.
If you want to find out more about these two engines, you’ve come to the right place.
We at JetDrift have compiled all you need to know under one roof!
What are Yamaha HO and SVHO Engines?
Yamaha HO and SVHO marine engines are internal combustion gasoline engines designed for Yamaha WaveRunners and jet boats. The HO (High Output) is the naturally-aspirated configuration rated at 180 HP. In contrast, the supercharged SVHO (Super Vortex High Output) puts out a remarkable 250 HP.
The Japanese manufacturer introduced these high-performance power sources in 2013 for the 2014 model year. They debuted in the race-inspired FZ WaveRunner series but they found their way to other Yamaha vessels.
Today, these engines are used in many high-performance (HO and SVHO) WaveRunners, as well as in many great Yamaha jet boats.
Unlike the 1049cc, TR-1 engine, which is derived from the Yamaha R1 motorcycle line, the HO and SVHO are purpose-built marine engines designed from scratch.
They are built from the same base engine, the features of which are as follows:
Yamaha HO and SVHO Specs List
- Type: 4-stroke, in-line
- Cylinders: 4-cylinder
- Displacement: 1812cc
- Bore: 86 mm
- Stroke: 78 mm
- Valves: 16 valves
- Cam configuration: DOHC
- Cooling: Open-Loop
- Fuel Supply System: Electronic Fuel Injection
- Lubrication System: Wet Sump
- Total Oil Capacity: 5.6 qrt.
- Manufacturer: Yamaha
What is the difference between HO and SVHO?
In a nutshell, the SVHO is the supercharged and intercooled configuration, which has a higher compression ratio (11.0:1), runs on premium gasoline and delivers more engine power (250 HP). In contrast, the HO has a compression ratio of 8.5:1, runs on regular gas, and delivers 180 HP.
These engines are paired with an 8-vane, axial-flow, single-stage jet pump for maximum thrust.
Yamaha HO vs. SVHO Comparison Chart
For a better comparison, we’ve compiled the differences between these two engines into this Yamaha SVHO vs. HO comparison chart:
|Bore x Stroke||86 x 78 mm||86 x 78 mm|
|Recommended Fuel||Regular Unleaded||Premium Unleaded|
|Engine Power||180 HP||250 HP|
|Pump Diameter (WaveRunners)||155 mm||160 mm|
This chart is for informational purposes only! For exact specifications, please refer to the factory manual.
Takeaways – FAQs About Yamaha HO and SVHO Engines
As a takeaway, we’ve answered the most common questions about the HO and SVHO Yamaha marine engines.
What is the Difference Between HO and SVHO?
The Yamaha HO and SVHO engines are based on the same 1.8L, 4-stroke, Yamaha marine engine, but the latter comes standard with a supercharger. Hence, it has a higher compression ratio, runs on premium gas, and delivers much more power. The HO is rated at 180 HP while the SVHO offers 250 HP out of the box.
What does HO Stand for?
HO here stands for “High Output.”
What does SVHO Stand for?
SVHO here stands for “Super Vortex High Output.”
Is the SVHO Supercharged?
Yes, Yamaha’s SVHO engine is boosted with a supercharger and intercooler.
Is the Yamaha SVHO reliable?
The Yamaha SVHO engine is known as one of the most reliable supercharged marine engines. When it comes to jet ski engines, the SVHO features the biggest displacement paired with a carefully-designed, low-maintenance supercharger. These features ensure more reliability and durability than competitor engines.
For example, the supercharger shaft or Sea-Doo PWC-s penetrates into the engine block. In case of a supercharger washer failure, metal debris could find its way into the engine internals much easier.
In contrast, Yamaha’s supercharger is much more separated from the engine internals. You can see the difference between the two designs in the picture below:
Kawasaki Jet Skis come with a belt-driven supercharger, which also requires more care and offers lower reliability.
How Much Horsepower Does a Yamaha HO Have?
The Yamaha HO marine engine is rated at 180 HP.
How Much Horsepower does a Yamaha SVHO Have?
The Yamaha SVHO marine engine is rated at 250 HP out of the box. With some aftermarket mods, it can even reach an amazing 350 HP!
How Fast is a Yamaha SVHO?
As a rule of thumb, WaveRunners with SVHO engines can reach a top speed of 65-70 mph, while Yamaha jet boats with the same engine top out at about 45-50 mph.
What Year did Yamaha Introduce the SVHO?
Yamaha released its SVHO engine in 2013 for the 2014 model year.
How Much Does a Yamaha SVHO Engine Weigh?
Although official specifications are not available, based on our research the Yamaha SVHO engine weighs about 260 lbs.
What is a Yamaha SHO Motor?
The Yamaha SHO was the predecessor of the more advanced SVHO. This engine was a 1812cc, fuel-injected, 4-cylinder, in-line engine rated at 235 HP.
Which Jet Ski Engine is the Biggest?
In terms of displacement, the biggest jet ski engine right now is the Yamaha HO/SVHO, displacing 1812cc. Surprisingly, this power mill is “only” rated at 180/250 HP, while the rival flagship Sea-Doo and Kawasaki engines produce 300 and 310 HP, respectively.
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