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Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model
Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model, view 2Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model, view 3Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model, view 4Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model, view 5Stirlingkit Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model, view 6
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Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model

$669.99$799.99Save 16%

In stock at stirlingkit.com

The RETROL R31 is a 4.2cc running V-twin four-stroke engine model based on the 1960s motorcycle Shovelhead. It is machined from brass and stainless steel, mounted on a wood base, and comes ready to run with CDI ignition. It suits collectors who want a working Shovelhead-style engine for display and demonstration.

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Highlights

  • 4.2cc air-cooled V-twin, OHV four-stroke
  • Brass and stainless steel
  • CDI ignition, drill or manual start
  • 1:5 ratio, 1,200g
  • Includes drill coupling shaft, hand puller and spare O-rings

Best for

Fans of classic Harley-style engines who want a running miniature for the desk or shelf.

Things to consider

  • Ignition needs 3 AA batteries, not included
  • Requires 95 octane gasoline with 2T oil at 25:1
  • Carburetor needle may need adjustment to start

Key specs

Price$669.99
Displacement4.2cc
Bore x stroke13mm x 16mm
Overall size150 x 120 x 140mm
Weight1,200g
Age14+

Our take

A charming running Shovelhead replica at a slightly lower price than the R33.

Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… at a glance

BrandStirlingkit
Price$669.99 (was $799.99)
TypeInternal combustion engine
AvailabilityIn stock at stirlingkit.com
Couponstart
ReturnsThe about page lists a 30-day return or exchange. All returns need an RMA requested via…

Price check

At $669.99, the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… is toward the top of Stirlingkit's price range, whose 2,729 listed products run $0.54 to $11,000.

It's currently 16% below its listed price of $799.99. Sale prices can end without notice, so check the live price before you order.

Similar items from other brands we track run $2.99 to $95.

Buying from Stirlingkit

Stirlingkit is a good source for hobbyists who want running miniature engines, Stirling and steam models, and build kits that most toy stores never carry. Skip it if you need fast, cheap returns, since everything goes through an emailed RMA to a Shenzhen address. Check the shipping method and warehouse at checkout first, because airmail can take 15 to 35 business days.

Shipping
Airmail takes 15 to 35 business days, EMS 5 to 8, and DHL Express 3 to 7. Shipping fees vary by product, warehouse, and destination and show on each product page and at checkout.
Returns
The about page lists a 30-day return or exchange. All returns need an RMA requested via service@stirlingkit.com, and items must include original packaging and accessories with no physical damage.
Warranty
The about page lists a 1-year warranty and lifetime customer support.

Read our full Stirlingkit review and shop all products →

Frequently asked questions

What is included?
The engine, a drill coupling shaft, hand puller, spare O-ring set and manual.
How does it compare with the R33?
Both are 4.2cc V-twins of similar size. The R31 follows the 1960s Shovelhead, the R33 the 1970s Evolution design.
Is the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… on sale?
Yes. Stirlingkit lists it at $669.99, down from $799.99 (16% off). Sale prices change, so confirm the live price on stirlingkit.com.
Is there a coupon code for the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV…?
Stirlingkit's store-wide code start can be entered at checkout on stirlingkit.com. Stirlingkit sets the discount, and some items or sale prices may be excluded.
What is Stirlingkit's return policy?
The about page lists a 30-day return or exchange. All returns need an RMA requested via service@stirlingkit.com, and items must include original packaging and accessories with no physical damage.
How long does Stirlingkit take to ship?
Airmail takes 15 to 35 business days, EMS 5 to 8, and DHL Express 3 to 7. Shipping fees vary by product, warehouse, and destination and show on each product page and at checkout.
Does the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… come with a warranty?
Stirlingkit's published warranty terms: The about page lists a 1-year warranty and lifetime customer support.
Where can I buy the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV…?
The Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… is sold directly by Stirlingkit on stirlingkit.com. The Shop now button on this page goes straight to the product there, and code start can be applied at checkout.
Is the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… in stock?
Yes. Stirlingkit lists it as in stock on stirlingkit.com as of our latest check. Stock and prices refresh throughout the day.
Is Stirlingkit a legit store?
Stirlingkit is a good source for hobbyists who want running miniature engines, Stirling and steam models, and build kits that most toy stores never carry. Skip it if you need fast, cheap returns, since everything goes through an emailed RMA to a Shenzhen address. Check the shipping method and warehouse at checkout first, because airmail can take 15 to 35 business days. Our full Stirlingkit review covers shipping, returns and what to check before ordering.
Is the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV… expensive?
At $669.99 it is toward the top of Stirlingkit's range ($0.54 to $11,000 across 2,729 products), and similar items from other brands run $2.99 to $95.

More from Stirlingkit

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