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EC P20-RK Pro Rebuild Kit for Tillotson HD Carburetors (Non-Accelerator Pump)
P20-RK EC Pro HD Rebuild Kit
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EC P20-RK Pro Rebuild Kit for Tillotson HD Carburetors (Non-Accelerator Pump)

Part Number: P20-RK
1 Review(s)
Online Price: $29.99
Availability: In Stock.

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The Tillotson HD Carburetor has not been in production for more than 40 years. 

But this has not stopped vintage snowmobile enthusiasts from enjoying their all original vehicles. 

Due to the age of these carburetors, parts, and support are limited. We use mostly aftermarket components, but where parts are most critical to the tuning and performance of the carburetor, we have made components superior to all other aftermarket kits.

The most crucial of those components is our fuel inlet seat. The number one problem with Tillotson HD carburetors is replacing the needle and seat with a poorly made fuel inlet seat. 

How do you know if you have a poorly made seat? At idle and low speed, your carburetor is flooding out, especially out the high side nozzle. Many believe this is due to the check valve in the nozzle, but this is not the case. Your nozzle needs to have more airspeed or more signals to pull fuel off the high side. If it's dumping fuel, then it's because nothing is controlling the fuel to the high side circuit. You will also see your high and low side needles do very little to tune out this problem. 

Cheaper kits recognize this problem and attempt to fix this by using an overly stiff inlet tension spring. This only adds more problems.

We have helped many customers fix this problem simply by using our fuel inlet seat. Our seat is made in the USA and designed to use the Tillotson OE fuel inlet needle of current carburetors. This not only fixes the issue but allows us to use the proper inlet tension spring for better tuning and performance.

We highly recommend using a pop-off/leak-down tester and the 714 fulcrum arm height gauge to check your carburetor for rebuilds.

P20-RK EC Pro Rebuild Kit for Tillotson HD Carburetors (Non-accelerator Pump) replaces Tillotson RK-86 Kit

Main Metering Diaphragm

Main Metering Diaphragm Gasket

Fuel Pump Diaphragm

Fuel Pump Diaphragm Gasket

Brass Fuel Strainer Screen

Fuel Strainer Cork Gasket

.437 Welch Plug

EC HD Fuel Inlet Seat

Captured Inlet Needle

Captured Fulcrum Arm

Copper Inlet Seat Gasket

High/Low Side Needle O-Ring

021 Inlet Tension Spring

91A-351R Fuel Inlet Cap

125-512 Fuel Filter

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Tillotson HD Gasket Kit
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Customer Reviews

the HD cure!
This needle/seat will cure the infamous HD instability. I have unsuccessfully tried two of the commonly available kits. The needle/seat look different from OEM, but the dimensions work out, so use them. It turns out the HD is a very fine carb. The included diagram is good, but also download the HD manual from Tillotson and follow it to the letter. Used on my '69 Johnson Skee-Horse.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from AK on 3/17/2023

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