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P7-MRK EC Pro Rebuild Kit for HR High Volume(Double Stack, Alky)Carburetors Mylar
P7-MRK EC Pro Mylar Double Stack HR Rebuild Kit
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P7-MRK EC Pro Rebuild Kit for HR High Volume(Double Stack, Alky)Carburetors Mylar

Part Number: P7-MRK
Your Price: $16.77
Availability: In Stock.

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The EC Pro Gasket Kits are exclusively constructed for professionals in the small engine racing world. 

We designed our kits using OE parts or equivalent to superior aftermarket components. Our aftermarket components prioritize racing condition durability and performance over cost and price margins of other aftermarket parts. 

Our kits also include additional components to better complete the rebuild or service performed on your carburetor. 

We also include a parts diagram without Pro kits, something no other OE or Aftermarket kits include. That has a parts break-down list that helps identify Tillotson carburetor parts as well as shows the carburetors assembly. This helps the D.I.Y. racer to know their carburetor is reassembled correctly. 

Our Pro Kits utilizes our "Fast Action" Main Diaphragm. This component is one that we made in the aftermarket as a performance upgrade over OE and other aftermarket metering diaphragms. This main metering diaphragm has improved response and reaction over standard metering diaphragms. The "wagon wheel" features a more consistent dowel height in the center, making the fulcrum height adjustment consistent as well as a better, more smooth metal finish compared to other diaphragms. 

This kit includes what we normally call the short alky seat. It's a short seat with a .093" orifice vs. the .062" of the smaller gas seat. This does not mean the .093" is exclusively used on methanol or alky carburetors. Its also used in many carburetors fitted on rotary or reed valve 2-cycle kart engines or larger displacement piston port 2-cycles and larger 4-cycle gas engines. 

The Fulcrum and Inlet Fuel Needle Valve are captured in this kit. Captured is where the fulcrum arm with a fork end “captures” the dowel on the head of the needle. A captured needle keeps the fulcrum arm in contact; this is usually preferred on rougher tracks, and if the carburetor is oriented is with the fuel pump stack facing downward. 

This kit uses bi-axially oriented polyester film (BOPET), commonly called Mylar® pump diaphragm. This diaphragm exceeds the quality of OE "mylar" diaphragms and is more fuel and chemical resistant making it suitable for methanol applications. We highly recommend using this kit for 4-cycle methanol applications and racing two-cycle reed engines. The (BOPET) will often outperform and has longer durability than the stock "snakeskin" Polytetrafluoroethylene (PTFE) material pump diaphragms. If you are rebuilding for an OE application, we still recommend the P7-RK as it includes a few additional components making your rebuilds more complete. 

This kit includes carburetor flange gaskets for the HR model carburetors; if you are looking for a complete rebuild kit for the high volume(double stack, alky) HL carburetors, you will want the P8-MRK.

Kit Includes:

• Main Diaphragm

• Diaphragm Gasket

• Fuel Pump Diaphragm

• Fuel pump Diaphragm Gasket

• Inlet Valve Diaphragm

• Inlet Valve Diaphragm Gasket

• Brass Fuel Strainer Screen

• Fuel Strainer Cork Gasket

• .375 Welch Plug

• .093" id Inlet Seat with Cross Hole (overall length .538)

• Captured Inlet Needle

• Captured Fulcrum Arm

• Inlet Seat Gasket

• High/Low Side Needle O-Ring

• 1.375 HR Flange Gasket

P7-RK EC Pro Rebuild Kit fits all HR High Volume(Double Stack, Alky)Carburetors including these carburetors used for small engine racing: HR-181B, HL191G 

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