EC Carburetors EC P8-MRK Pro Rebuild Kit For HL High Volume(Double Stack, Alky)Carburetors

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 and 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 uncaptured in this kit. The uncaptured fulcrum arm is with a forked tab instead; the end rests on top of the needle. The uncaptured needle does not have a dowel for the arm to “capture”. This traditional has been used on smoother racing surfaces but is very common for any kart racing engine. 

Our new brass fulcrum arm is another innovation from the guys here at EC. This arm is preset for .065″ which is our recommended fulcrum arm height for methanol(alky) carburetors. We still recommend checking your fulcrum arm height in cases the arm is slightly bent in shipping or when you install the fulcrum arm.

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. 

This kit includes carburetor flange gaskets for the HL model carburetors; if you are looking for a complete rebuild kit for the high volume(double stack, alky) HR carburetors, you will want the P7-RK or P7-MRK

The P8-MRK replaces the Tillotson RK-104HL kits

Kit Items:

– 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)

– Uncaptured Inlet Needle

– Uncaptured Fulcrum Arm

– Inlet Seat Gasket

– High/Low Side Needle O-Ring

– 1.00″ Flange Gasket

– 1.060″ Flange Gasket

– 1.125″ Flange Gasket

P8–MRK EC Pro Rebuild Kit fits any HL High Volume(Double Stack, Alky)Carburetors including these racing carburetors: HL-314G, HL-248A Thru E, HL-355A thru E, HL-360B, C, HL-368A, HL-380A, B, HL-304WXA