1. Old Chainsaw Parts Items
  2. sku: 6765743307117883
  3. STIHL HD21B

STIHL HD21B Chainsaw Carburetor 029 039 MS290 MS310 MS390

Ms390 Stihl Hd21b 029 039 Ms290 Ms310 Chainsaw Oem Carburetor See Desc

( Brand: Stihl ), ( Manufacturer Part Number: HD21B ), ( Model: STIHL-029 ), ( Compatible Brand: For Stihl ), ( Power Source: Gasoline ), ( Color: Multicolor ), ( Compatible Model: Stihl, Stihl 029, Stihl 039, Stihl Ms290, Stihl Ms310, Stihl Ms390 ), ( Material: Aluminum, Metal, Plastic, Steel ), ( Compatible Product: Chainsaw ), ( Engine Type: 2-stroke ), ( Type: Carburetor ), ( Capacity: Dna ), ( Assembly Required: Yes ), ( Voltage: 12 V )

Review STIHL 029 039 Chainsaw Oem Carburetor See Desc

The STIHL HD21B chainsaw is a versatile and powerful tool designed for various cutting applications. One of its essential components is the carburetor, which plays a significant role in the engine's performance. The HD21B comes with two different carburetors depending on the engine size: MS290 for the 29cc engine and MS310/MS390 for the larger 31.8cc and 38.8cc engines, respectively.

The STIHL MS290 and MS310/MS390 carburetors are two-stroke engines that employ a constant-level fuel system. This system maintains a consistent fuel level in the crankcase, ensuring an adequate fuel supply to the engine for optimal combustion. The carburetors feature a flat slide throttle control that allows for smooth and efficient engine operation.

The MS290 and MS310/MS390 carburetors are designed with a number of advanced features to enhance the chainsaw's performance and ease of use. These features include:

1. Idle adjustment: The carburetors come with an adjustable idle screw, allowing users to fine-tune the engine's idle speed for various operating conditions.

2. Air filter: The carburetors are equipped with a reliable and easy-to-clean air filter, which ensures clean air enters the engine and maintains optimal combustion.

3. Fuel filter: The MS290 and MS310/MS390 carburetors have a built-in fuel filter that prevents contaminants from entering the engine, ensuring a clean fuel supply and prolonging the engine life.

4. Centrifugal clutch: The carburetors come with a centrifugal clutch, which automatically engages the chainsaw chain based on engine speed, ensuring smooth and efficient power transmission.

5. Adjustable fuel/air mixture: The MS310/MS390 carburetor comes with an adjustable fuel/air mixture screw, allowing users to fine-tune the engine's performance for different fuel types and operating conditions.

In conclusion, the STIHL HD21B chainsaw's MS290 and MS310/MS390 carburetors are essential components that contribute significantly to the saw's overall performance and ease of use. These carburetors offer advanced features such as idle adjustment, air and fuel filters, centrifugal clutch, and adjustable fuel/air mixture, ensuring efficient and reliable operation in various cutting applications.

A Comparative Analysis of STIHL HD21B, MS290, MS310, and MS390 Chainsaws: Carburetor Edition

Introduction:

STIHL, a renowned brand for power tools, offers a diverse range of chainsaws. Among them, the HD21B, MS290, MS310, and MS390 models are popular choices for various users. This analysis compares these models based on their MS (Magnum Series) carburetors to assist potential buyers in making an informed decision.

1. MS290:

The MS290 chainsaw is characterized by its 2-stroke, 50.2 cc engine with a 21.1-inch bar length. It features a single-lever emission control system and an advanced stratified scavenging system.

Pros:

- Lightweight and easy to maneuver

- Relatively quiet operation

- Good fuel efficiency

- Consistent power delivery

Cons:

- Not suitable for heavy-duty tasks

- May require frequent tuning

- Emission control system might impact starting performance

2. MS310:

The MS310 chainsaw is a 2-stroke, 45.3 cc engine model with a 16-inch bar length. It has an advanced stratified scavenging system and a single-lever emission control system.

Pros:

- Ideal for medium-duty tasks

- Good power-to-weight ratio

- Consistent power delivery

- Easy to start and handle

Cons:

- More expensive than MS290

- Fuel consumption might be higher

- Slightly heavier than MS290

3. MS390:

The MS390 chainsaw is a 2-stroke, 46.3 cc engine model with a 16-inch bar length. It comes with an advanced stratified scavenging system, a single-lever emission control system, and a side-access chain tensioner.

Pros:

- Suitable for heavy-duty tasks

- Consistent power delivery

- Easy chain tensioning

- Good fuel efficiency

Cons:

- Heavier than MS290 and MS310

- More expensive than MS310

- May require more frequent maintenance

4. HD21B:

The HD21B chainsaw is a 2-stroke, 34.2 cc engine model with a 16-inch bar length. It features a side-mounted chain tensioner and a simplified emission control system.

Pros:

- Lightweight and easy to maneuver

- Ideal for small to medium-duty tasks

- Easy to start and handle

- Relatively low maintenance

Cons:

- Less powerful than MS models

- Limited bar length options

- Not suitable for heavy-duty tasks

Conclusion:

The choice between the STIHL HD21B, MS290, MS310, and MS390 models depends on the user's specific needs, budget, and task requirements.

For light-duty tasks and small projects, the HD21B is an excellent choice due to its lightweight design and ease of use.

For medium-duty tasks, the MS310 offers the right balance between power and portability.

For heavy-duty tasks, the MS390 is the most suitable option due to its powerful engine and durability.

Based on the carburetor aspect, all these models share similarities in their 2-stroke design and advanced scavenging systems. However, potential buyers should consider the specific features, pros, and cons of each model to make an informed decision based on their individual requirements.

Details:

Our Carburetors are really unknown condition, some will run might need a cleaning or overhaul. I don't guarantee fitment on your machine, can only tell you what it came off of.

part #: hd21b prices

  • $29.77-$68.00

specifications sawpancho:

  • brand: Stihl
  • mpn: Hd21b
  • model: Stihl-029
  • compatible brand: For Stihl
  • power source: Gasoline
  • color: Multicolor
  • compatible model: Stihl, Stihl 029, Stihl 039, Stihl Ms290, Stihl Ms310, Stihl Ms390
  • material: Aluminum, Metal, Plastic, Steel
  • compatible product: Chainsaw
  • engine type: 2-stroke
  • type: Carburetor
  • capacity: Dna
  • assembly required: Yes
  • voltage: 12 V

offer sawpancho:

  • best offers: True
  • quantity: 1
  • availability: In Stock
  • sold: 0
  • started: July 15, 2025
  • options: Ship-to-home

seller sawpancho:

  • city: Sauk Centre, Minnesota
  • rating: 99.6%
  • # reviews: 2681

payments sawpancho:

  • wallet: Google-pay
  • other
  • credit card: Mastercard

general sawpancho:

  • Yard, Garden Outdoor Living > Outdoor Power Equipment > Chainsaw Parts
  • condition: Used

returns sawpancho:

  • paid by: Buyer
  • time: 30 Days
  • policy: Returns Accepted
  • method: Money back

shipping sawpancho:

  • service: USPS Ground Advantage
  • cost: $5.00
  • type: Fixed
  • transit: 2-6 Days
  • carrier: USPS
  • class: Standard
compatible brand: for stihl, power source: gasoline, compatible model: stihl, stihl 029, stihl 039, stihl ms290, stihl ms310, stihl ms390, compatible product: chainsaw, engine type: 2-stroke, type: carburetor, capacity: dna, assembly required: yes, voltage: 12 v,
category: home & garden > yard, garden outdoor living > outdoor power equipment > chainsaw parts, color: multicolor, material: aluminum, metal, plastic, steel, sku: 6765743307117883,

Stihl HD21B Is Similar To:

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5 offers $29.77–$68.00 USD
  • Offer #1: $68.00 price + $23.95 shipping estimate = $91.95* total. LOCATION: BAY 9057.+$23.95 shipping
  • Offer #2: $29.77 price + $0.00 shipping estimate = $29.77* total. Replace Part Number: 1127 120 0650 (HD-19C). 029 039 chainsaw.FREE SHIPPING
  • Offer #3: $33.90 price + $0.00 shipping estimate = $33.90* total. 1 x air filter. Compatible with 029 039 Chainsaw.FREE SHIPPING
  • Offer #4: $40.06 price + $0.00 shipping estimate = $40.06* total. Item must be in original, uninstalled condition with no modifications. Are these genuine OEM parts?.FREE SHIPPING
  • Offer #5: $12.65 price + $0.00 shipping estimate = $12.65* total. Fit STIHL 046 MS460. Fits Models STIHL 029 039.FREE SHIPPING

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