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PWK28 28mm Methanol Slide Carburetor Kit for Predator/Clone
PWK28 28mm Methanol Slide Carburetor Kit for Predator/Clone
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PWK28 28mm Methanol Slide Carburetor Kit for Predator/Clone

Part Number: PWK-28-4K
Online Price: $199.99
PWK28 28mm Bore Slide Carburetor Kit for Honda-Clone Engines – Methanol Tuned
Availability: In Stock.

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Description

PWK28 28mm Bore Slide Carburetor Kit for Honda-Clone Engines – Methanol Tuned


The PWK28 is a high-performance 28mm bore slide carburetor specifically tuned for popular Honda-Clone engines, including Tillotson, Predator Wildcat, Ducar, and the original Honda models. Featuring a d-shaped slide design, this carburetor offers superior flow characteristics compared to traditional round-slide carburetors, delivering enhanced throttle response and consistent tuning precision.


Designed to provide ample airflow, the PWK28 is ideal for engines with big valve ported heads as well as most billet heads. It is pre-tuned for methanol fuel, which typically yields a 10% power increase over gasoline, with some setups experiencing gains up to 20%, depending on the engine combination.


Important Methanol Use Warning:
Methanol can attract moisture and cause corrosion or damage to critical components such as diaphragms and inlet needles. After each race or run day, it is essential to flush methanol from the carburetor and fuel system. We recommend running a 2-cycle oil mix or 8 oz of Marvel’s Mystery Oil per gallon of non-ethanol gasoline through the fuel lines, pump, filter, and carburetor until the engine begins to emit black smoke or stall—signaling that the methanol has been cleared. After flushing, drain the oil and never store your carburetor or engine with methanol remaining in the system.


Fuel System Compatibility:
This carburetor is designed exclusively for use with fuel pump systems and is not compatible with gravity-feed setups.


Additional Features:

  • Includes a velocity stack/air filter adapter compatible with common 2.5-inch air filters for easy installation and optimal airflow.

Note on Environmental Factors:
All carburetors, including the PWK28, are influenced by atmospheric conditions such as barometric pressure, humidity, ambient temperature, and elevation. While each carburetor is calibrated, tuned, or jetted for general applications, fine-tuning may be necessary to achieve peak performance based on your specific environment.

FAQ

PWK28 Carburetor & Compatibility Questions

Q: Can this carburetor run or be tuned for E85 or other ethanol blends?
A: We do not recommend using ethanol fuels like E85 in small engines equipped with this carburetor. Ethanol blends vary seasonally and regionally, which can cause inconsistent performance and complicate carburetor tuning. Ethanol also absorbs moisture from the environment, which can lead to water contamination and degraded engine performance. Additionally, many modern carburetor components such as o-rings and inlet needles are made from polymers that are more sensitive to ethanol. Over time, ethanol can cause these parts to shrink, swell, or deteriorate, leading to leaks or failure. For best results and engine longevity, use pure gasoline whenever possible.


Q: Does the intake match the d-shaped port of my engine?
A: The intake is specifically designed for the Tillotson JT-207 d-shaped port, which fits the majority of compatible engines. However, some variations may exist depending on the engine brand and cylinder head model. Notably, the Ducar 212, Tillotson 212E, and Ghost 212 engines, which use the Ducar Hemi Head, have a slightly different port shape that may require custom port matching for an optimal seal and fit.


Q: What is the barb fitting on the intake used for?
A: The barb fitting is designed to provide a vacuum signal for external fuel pumps. It’s the preferred location to tap into the vacuum pulse, as opposed to the crankcase or valve cover, for more consistent and reliable fuel pump operation.


Q: Is this carburetor designed for gravity feed or fuel pump systems?
A: It works with both, but with important considerations:

  • Gravity Feed: If using a stock fuel tank, the outlet must be positioned higher than the carburetor fuel inlet for proper fuel flow. In most stock setups, this is not the case, so the tank usually needs to be raised. When relocating or using a remote tank, keep it within a couple of feet of the carburetor to avoid excessive fuel pressure. A tank positioned too high can pressurize the carburetor inlet valve, forcing it open and causing a rich fuel condition.

  • Fuel Pump: Use a round-style vacuum fuel pump (like the Walbro FPC-1). Avoid electric fuel pumps or certain dual-feed pumps that can produce too much pressure, again risking forcing the inlet valve open and creating a rich condition.


Q: How does this carburetor compare to VM22 Chikuni (Chinese Mikuni) carburetors?
A: The PWK series offers superior performance in several areas:

  • Better tuning flexibility

  • Smoother and more stable idle

  • Improved throttle response

  • Higher overall power output
    These advantages make the PWK carburetor a better choice for those seeking consistent and enhanced engine performance over the typical round-slide Chinese Mikuni carburetors.


Q: How does the PWK compare in value to VM22 Chikuni carburetors?
A: When both carburetors are properly tuned, performance differences can be marginal. However, the PWK often provides better value due to its lower price point, making it an economical upgrade without sacrificing quality or performance.


Q: How does this carburetor compare to Tillotson or diaphragm carburetors?
A: Tillotson and other diaphragm carburetors can have tuning and performance advantages when correctly matched to the engine and application. However, they are generally less suitable for 4-cycle engines that require stable idling and smooth throttle transitions, as diaphragm carbs tend to be finicky and do not idle well. For most recreational or kart racing uses, we recommend bowl-style carburetors like the PWK for easier tuning and more reliable performance.

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