R&R engines are high-performance aftermarket V-twins sold in small quantities. The American manufacturer offers a complete line of billet engines with displacements of 113-155”. The power of these amazing engines can go up to an eye-popping 173 HP!
If you want to find out more about these legendary R&R engines, this post is for you.
From the specifications to the key facts on the manufacturer, we at PowerSportsGuide have compiled everything into this R&R engine review!
What is an R&R Engine?
R&R motorcycle engines are manufactured by R&R Cycles Inc. The company was established in 1995 and is now headquartered in Manchester, New Hampshire. R&R Cycles claims itself to be “the leader in American V-Twin performance,” and with good reason.
Besides a wide variety of aftermarket performance parts and packages, you can find some complete big-inch V-Twin engines in the company’s offering.
These power mills are widely popular among performance-minded riders and custom motorcycle builders.
Let’s get down to the nitty-gritty and talk about them in detail!
R&R Engine Reviews
As the old saying goes, “There’s no replacement for displacement.”
And when it comes to R&R engines, we talk about serious displacements ranging from 113” up to a whopping 155”! To be more specific, production R&R engines are as follows:
- R&R 113”
- R&R 127”
- R&R 139”
- R&R 147”
- R&R 155”
These big engines not only provide more torque and power, but they also tend to be more durable than their smaller brothers. R&R engines are built in-house but they utilize some parts from external suppliers like S&S.
Each R&R engine is available with either a raw, polished, or black finish.
R&R 113” Engine Review
Despite its serious size, the 113” is the smallest engine in the R&R fleet.
This unit is a unique blend as it’s built on high-quality S&S lower-end components, which are complemented with an R&R carb and top components.
Since these parts are perfectly matched, the R&R 113” produces great reliability and performance.
Another key advantage of this size is that it fits the frame of much smaller stock and custom-built bikes.
Ket key specifications of the R&R 113” engine are as follows:
- Displacement: 113 cu in
- Horsepower: 125-130 HP
- Bore: 4.000”
- Stroke: 4.500”
- Compression: 11.00:1
- Carb: S&S Super “G”
R&R 127” Engine Review
The R&R 127 engine is intended to be a replacement V-twin engine that will fit in a stock Softail chassis. However, it can also act as the heart of any custom bike.
Specifications:
- Displacement: 127 cu in
- Horsepower: 135-140
- Bore: 4.250
- Stroke: 4.500
- Compression: 11.00:1
- Carb: S&S Super “G” With Thunder Jet
R&R 139” Engine Review
If you are looking for some more power, you can’t go wrong with the 139” R&R engine rated at 145-150 HP.
Specifications:
- Displacement: 139 cu in
- Horsepower: 145-150 HP
- Bore: 4.375
- Stroke: 4.625
- Compression: 11.00:1
- Carb: S&S D W/3 Thunder Jets
R&R 147” Engine Review
The R&R 147” is the bigger brother of the 139” engine. They feature the same 4.625” R&R flywheel assembly and case, but the former comes with a bigger bore, 4.5” billet cylinders.
The key specifications of the 147” engine are as follows:
- Displacement: 147 cu in
- Horsepower: 155-160
- Bore: 4.500
- Stoke: 4.625
- Compression: 11.00:1
- Carb: S&S D W/3 Thunder Jets
R&R 155” Engine Review
The flagship R&R 155” is one of the most powerful V-twin motorcycle engines available off the shelf.
Just like its 139” and 147” counterparts, the R&R 155” also utilizes the 4.625” R&R flywheel assembly, which is completed with two 4.60” cylinders mounted on a heavy-duty billet crankcase.
This power mill is the most powerful engine in the R&R lineup with an incredible performance of 168-173 HP.
Specifications:
- Displacement: 155 cu in
- Horsepower: 168-173 HP
- Bore: 4.600”
- Stroke: 4.625”
- Compression: 10.8:1
- Carb: S&S D W/3 Thunder Jets
R&R Engine Specs Chart
For your convenience, we’ve compiled the key specifications of R&R engines into one chart:
| Model | Displ. (cu in) | HP | Bore (“) | Stroke (“) | Compression |
| R&R 113″ | 113 | 125-130 | 4.000 | 4.500 | 11.0:1 |
| R&R 127″ | 127 | 135-140 | 4.250 | 4.500 | 11.0:1 |
| R&R 139″ | 139 | 145-150 | 4.375 | 4.625 | 11.0:1 |
| R&R 147″ | 147 | 155-160 | 4.500 | 4.625 | 11.0:1 |
| R&R 155″ | 155 | 168-173 | 4.600 | 4.625 | 10.8:1 |
Disclaimer: These charts are for informational purposes only! For more information, please check the official factory manuals!
Takeaways – FAQs About R&R Engines
As a takeaway, we’ve answered the most frequent questions about R&R engines!
What Size Engines Does R&R Make?
R&R Cycle offers complete engines with displacements from 113” up to 155”.
How Much Horsepower Does an R&R Engine Have?
The HP ratings of R&R engines range from 125 up to 173 HP:
- R&R 113” engine: 125-130 HP
- R&R 127” engine: 135-140 HP
- R&R 139” engine: 145-150 HP
- R&R 147” engine: 155-160 HP
- R&R 155” engine: 168-173 HP
However, the final HP and torque figures depend on many factors like the exhaust system and other features on the bike.
How Much Do R&R Engines Cost?
As a rule of thumb, the prices of R&R motorcycle engines range from $9,000 up to $15,000.
Compared to competitor models R&R engines seems quite expensive, but don’t forget that these units are custom built with high-quality materials to the highest of standards.
They also provide industry-leading performance and durability.
Is R&R a Harley Engine?
Contrary to popular belief, R&R engines are not manufactured by Harley-Davidson. Instead, R&R is an aftermarket V-twin engine brand that offers replacement engines for Harley-Davidsons and other V-twin motorcycles.
Is R&R Cycle Still in Business?
Yes, to the delight of many performance-minded riders, R&R Cycle is still in business. You can find out more by contacting the manufacturer here.
Are R&R Engines Any Good?
Yes, R&R engines have built a reputation for durability, reliability, and outstanding performance. This is why R&R is one of the most popular brands in the big-inch V-twin segment.
The only challenge might be finding a reputable dealer in your area!
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