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Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model - RETROL 4-Stroke & Inline Engines
RETROL

Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model

✓ Precision Quality Inspected • Backed by 30-Day Guarantee
$669.99 USD $799.99 Save $130.00

Engineering Summary

The Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model is a 4.2CC; 4-Stroke & Inline Engine precision-engineered by RETROL. Features construction machined from brass, stainless steel; and operating on 95# gasoline;. Available for $669.99 USD with free worldwide tracked shipping, 30-day returns, and replacement parts support at Stirlingkit.

✓ Free Worldwide Shipping: Tracked air delivery in 5–14 business days.
✓ Missing Parts Guarantee: Free replacement parts dispatched within 7 days.
✓ 30-Day Risk-Free Returns: Full refund on unbuilt kits in original box.

Technical Specifications

24 Verified Parameters
Brand RETROL;
Item No R31;
Material brass, stainless steel;
Color Brass, Silver;
Overall Size 150*120*140mm;
Engine Size 120*90*110mm;
Wood Base Size 150*120*30mm;
Ratio 1:5;
Weight 1200g;
Form ready to run;
Type two-cylinder four-stroke gasoline engine;
Displacement 4.2CC;
Cylinder Diameter 13mm;
Stroke 16mm;
Cooling Method air cooling;
Start Mode electric drill start/manual start;
Ignition Method CDI electronic igniter;
Spark Plug Type 3/16-40 inch threaded spark plug;
Lubrication Method mixed/splash lubrication (gasoline/oil=25/1);
Fuel Type 95# gasoline;
Oil Type 2T engine oil;
Starting Power Supply 4.5V AA battery *3 (not included);
Suitable Age 14+;
Packing Method gift box;

Features, Architecture & Package Contents


 

Product parameters:
Brand: RETROL;
Item No.: R31;
Material: brass, stainless steel;
Color: Brass, Silver;
Overall size: 150*120*140mm;
Engine size: 120*90*110mm;
Wood base size: 150*120*30mm;
Ratio: 1:5;
Weight: 1200g;
Form: ready to run;
Type: two-cylinder four-stroke gasoline engine;
Displacement: 4.2CC;
Cylinder diameter: 13mm;
Stroke: 16mm;
Cooling method: air cooling;
Start mode: electric drill start/manual start;
Ignition method: CDI electronic igniter;
Spark plug type: 3/16-40 inch threaded spark plug;
Lubrication method: mixed/splash lubrication (gasoline/oil=25/1);
Fuel type: 95# gasoline;
Oil type: 2T engine oil;
Starting power supply: 4.5V AA battery *3 (not included);
Suitable age: 14+;
Packing method: gift box;
Packing list: engine*1, electric drill coupling shaft (starting rod)*1, hand puller*1, spare O-ring*1set, manual*1.
Features:
1. This is a miniature gasoline engine model based on the V-twin motorcycle shovel engine in the 1960s. It embodies the spirit of different ages in a fantastic way.
2. The machine with retro charm, classic fuselage lines, cold cooling structure, new carburetor design, toggle throttle lever, can restore the details of the real engine, which is one of the most complicated engines we have produced.
The machine with retro charm, classic body lines, cold cooling structure, brand new carburetor design, toggle throttle lever, upgraded valves for intake and exhaust, obvious power improvement, and can restore the details of the real engine. This is our One of the most complex engines ever produced.
3. Every part of the engine has been carefully designed and processed by us. It is machined from brass and stainless steel and has a wooden base for easy positioning and maneuvering, ensuring smooth operation.
4. The engine is ready to run at any time, including starting and ignition equipment, which is more friendly to novice model enthusiasts. When it works, you won't be disappointed. You'll be amazed at how well it works.
5. It has become a coveted collectible, worth displaying and playing with. Whether it is for personal use, or as a personalized high-end model gift to friends on major festivals, it is suitable for family members.
Precautions:
1. When the ignition device is normal and the cylinder compression is normal, if the machine cannot start normally, it is likely that the carburetor needle needs to be adjusted.
2. After tightening the main oil needle on the carburetor, loosen 1/4 turn, start the flywheel, so that the mixing ratio of gasoline and air reaches the normal working mixing ratio after several times.
3. When the machine stops, the power switch should be turned off.

Verified Builder Reviews

Authentic feedback from hobbyists, machinists, and scale model engineers

No written reviews have been submitted for this specific kit yet. Have you built the Retrol Gas 4.2CC OHV V-Twin Miniature Shovelhead R31 OHV Four-stroke Internal Combustion Engine Model? Email service@stirlingkits.com with your bench photos to share your build log.

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