SKU: 27173033871

CISON FL4-175 Flathead Inline 4 Cylinder Four Stroke 9,000rpm RC Water-cooled Gasoline Engine 17.5cc

Sale price$450.00 Regular price$500.00
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Description

CISON FL4-175 Flathead Inline 4 Cylinder Four Stroke 9,000rpm RC Water-cooled Gasoline Engine 17.5ccCISON FL4 175 Flathead Inline 4 Cylinder Four Stroke 9,000 rpm RC Water cooled Gasoline Engine 17. 5cc Shipping update on 2022 10 14: this engine is in stock now, 6pcs for kit version, and 2pcs finished version. hurry up or it will have no stock. any problems please contact service@stirlingkit. com Miniature Engineering Models that Run on Fuel This small silver engine, called FL4 175, is a 17. 5cc water cooled flathead side valved engine that burns

CISON FL4-175 Flathead Inline 4 Cylinder Four Stroke 9,000 rpm RC Water-cooled Gasoline Engine 17.5cc

Shipping update on 2022/10/14:  this engine is in stock now, 6pcs for kit version, and 2pcs finished version. hurry up or it will have no stock. any problems please contact [email protected]

 

 

Miniature Engineering Models that Run on Fuel


This small silver engine, called FL4-175, is a 17.5cc water-cooled flathead side-valved engine that burns gasoline on CDI ignition. A small amount of oil is added to the crankcase for internal lubrication and caster oil is added to the fuel for upper end lubrication. Aluminum CNC precision machining is used to make the main body of the engine. It features bi-metal piston rings made out of cast iron, high-performance hardened cylinder liner, one-piece crankshaft. Sandblasting oxidation on the engine surface makes a good metal texture and sense of mechanical engineering.

As we all know, a flathead engine is also called as a sidevalve engine or valve-in-block engine that is an internal combustion engine with its poppet valves contained within the engine block, instead of in the cylinder head, as in an overhead valve engine. In the past, Sidevalves were widely used internationally by automobile manufactures from the late 1890s until the mid-1950s but were replaced by more efficient overhead valve and overhead camshaft engines. 

To provide an impressive performance, this unique FL4-175 engine features a simple and reliable construction, a compact small size but with large displacement. It's a good combination of retro and modern machinery. 


Long stroke and high torque

the engine is designed with a side valve structure for lower gravity and lighter weight and offers higher torque output based on the long stroke. Having higher torque allows for greater horsepower at lower rpms.


Responsive and powerful

the engine boasts metal stainless steel integrated printing inlet pipes and exhaust pipes and independent single carburetor for easy calibration, more sensitive throttle response, deep and powerful sound.  


Effective and lasting work

the external oil pump is utilized for crankshaft supplement and superior independent lubrication when matched with mini oil filters. The engine is cooled with water cycle for longer operation and lifespan.  


Convenient ignition

the self-developed four-cylinder electronic igniter with a compact size and strong anti-interference makes the engine ignition more stable and more friendly to remote control electronic device users.  


Upgrade

the oil bottom shell is reserved for observation window which is modifiable into a transparent window for real-time crankshaft operation observation. The flywheel end is reserved for the installation of simulated automobile mechanical manual clutch for users to upgrade.  


RC compatibility

the lightweight engine is compatible with RC models and is an incredible "heart" for low torque demanding 1/8 and 1/10 scale model crawlers.

 


Collection and gift

the engine makes a perfect addition for machine enthusiasts, engine model aficionados and collectors, an excellent choice for RC oil models and a high-end personalized gift for family and friends.


.Note:

base, CDI igniter, spark plugs, battery and oil filter are not included. buy it here.

i recommend you use the 2S-3S lithium battery (7.4-12V battery). Please use the engine in line with the instructions to avoid damage by improper operation. Please feel free to contact us if you have any questions.  
Buy other accessories here.

Specifications:

.Material: Metal
.Brand: CISON
.Model: FL4-175
.Form: assembly version
.Cylinder Dimensions: 96 x 43mm
.Weight: 1100g
.Displacement: 17.5cc
.Bore: 16.7mm
.Stroke: 20.0mm
.Torque: 1600-9000RPM (or adjusted to lower idle speed)
.Power: 2.5PS
.Lubrication Method: splash lubrication/independent lubrication
.Cooling Method: water cooling
.Ignition Method: self-developed four-cylinder CDI electronic ignition
.Start Method: electric
.Power Supply/Battery: 6-12V / 2-3S lithium battery
.Fuel: gasoline
.Suitable Age: 14+  
.Product Dimensions: 13.5 x 4.3 x 9cm
.Product Weight: 1500g
.Package Dimensions: 20 x 15 x 15cm
.Package Weight: 1700g
.Packing: Graphic Carton

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 27173033871

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Jackiee
Belleville, US
★★★★★ 5
this pillow does work
For months my neck had been brothering me every morning when I woke up. Figured it was stress and I always planned on getting a massage. But I never did it. I ended up seeing this pillow on Amazon and got it. It was almost an instant 180. My neck pain is gone! This pillow is stuffed very full but isn't super firm. It's a bit hard to describe. The seams are well sewn and the pillow has held up very well for a week now. No weird smells or any type of red flag that I found. It's easy to flip and reshape in an instant.
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Reviewed in the United States on May 15, 2025
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Pamdirac
New York, US
★★★★★ 5
Comfortable to use with firm support
This set of queen-size pillows has a great balance between softness and support. The down alternative fill feels plush and comfortable. The pillows also provide enough firmness to support the neck and shoulders. A better sleep quality achieved with less tossing and turning. For sleeping on side, back, or stomach, the pillows keep their shape and offer consistent comfort. A good choice for the improvement of sleep quality with more comfort.
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Reviewed in the United States on June 11, 2025
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Verified Purchase
ladyesmiles
Los Angeles, US
★★★★★ 5
Very comfortable and supportive.
I really am quite amazed with these pillows. As with most people who suffer from neck and back pain it's almost impossible to find a comfortable pillow. One year I must have went through 20 sets trying to find the right pillow. I received these and they were flat in the package. All you have to do is take them out and fluff them up a little bit with your hand and let them sit overnight. What's really nice about these is they are soft and cushy but they have a support that does not flatten when you lay down. Of note when I was looking for pillows, I noticed that these had a price of $110 which was crossed out and then a huge discount. Looking at the item now I see that the top price for the king size is $42. So I'm going to say that $110 was a comparison of what a good pillow might cost. I do want you to know that a set of pillows that I had been using were $200 a piece and these are very comparable to that. I am not having any issues overheating with these as I have a very nice cover on them. They are washable. My neck feels totally better. So all in all I am quite impressed with these pillows and very surprised that the first set I ordered is working perfectly for me. I am a side sleeper and needed my neck to be straight and these do the job with a nice little cushion on them.
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Reviewed in the United States on April 29, 2026
K
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Kathleen Regan
Lake Worth, US
★★★★★ 5
The BEST pillow you will ever sleep on!!
The BEST pillow you will ever purchase!! Right amount of firmness and support yet soft!! Quite the sleep enhancer!!
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Reviewed in the United States on May 27, 2026
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Gardening 1
Fort Morgan, US
★★★★★ 1
FLAT
Flat as a pancake. No support. No fluff. very incomfortable. Returning,
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Reviewed in the United States on May 1, 2026

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