Setting up your Rotax Max Jetting is one of the most crucial elements of race setup. This guide will give you the tips you need.

Rochester 2G & 2GC carburetor kit. These are the early 2 barrel carburetors.

These carburetors were also used on many tri-power installations, but don't assume all 3 of your carburetors use this kit. Made of high quality parts made in the USA.

Designed for today's fuel. Carburetor Kit Contents Instructions - exploded view, parts list, illustrated adjustments Accelerator pump - ethanol ready Viton tip needle & seat Float bowl gasket Throttle body gasket Fuel inlet washer Venturi cluster gasket Thermostat gasket Flange (mounting) gasket Bowl vent rubber Check balls (smallest aluminum ball resides in the pump well) Accelerator pump delayer retainer Choke housing gasket Throttle lever gasket This carburetor kit will contain parts that will not be used on your carburetor. We also provide manuals and videos for most carburetors. Please visit our free manual section.

The needle & seat assembly includes 2 gaskets. Try the thin gasket 1st.

If the float level is very low, then replace the thin gasket with the thicker gasket. Polish your accelerator pump well so that the pump cup glides smoothly. Even the best ethanol ready pumps can fail if the ethanol concentration is high enough. Use StarTron in you gas.

Need a for your 2 jet carburetor? Rebuild kit, made in the USA from high quality ethanol ready parts. Everything shown in the photo is included in the kit, additional parts may be purchased by choosing your carburetor type in our main catalog. For additional help including rebuild videos, free manuals, and troubleshooting, please see our technical section. For additional information see related tabs above.

To confirm this kit matches your carburetor number refer to the application/carb tab. To make sure you get the correct carburetor kit, please match your carburetor number with the list provided. This kit is good for the carburetor numbers listed only. No return on opened kits.

I had visited the local Napa parts store to purchase an overhaul kit For my 2GC Rochester carburetor. My carburetor number didn't match any kits they could find and wouldn't cross reference.

So I got online and found Mikes. I still couldn't find my number anywhere. It was like the factory skipped right over that number. Well I found in one of Mikes kits that was really what I would call a universal 2GC kit. It had many different gaskets.

The pictures were well thought out and I was able to match each one of my gaskets in that kit. I also found Mikes video on the 2GC overhaul. While I have built these little carbs in the past his tips were very helpful. I would recomend this company to anybody asking. If it had not been for Mikes I would have had a really tough time finding the correct kit. Thank you Mikes Carbs. Keep up the great work.

Donnie White. Hayden Alabama. Diesel Mechanic. Q: I have a 1965 GTO with Tri-power. The car was originally built with a 389, the tri-power, and an automatic transmission. The motor has been changed to a 1966 Bonneville 421 and a 4 speed manual transmission.

I do not believe the rear gear has been changed. It does have tri-power still but I don't know if it was the set that cam from the factory on the original 389 or the replacement 421 engine. The ID tags are of course gone from all three of the carbs. They are obviously Rochester 2G carbs and the center carb has a divorced choke.

I'm having trouble starting the car after it has set for a week or more only. It starts promptly if it sets a day or two. I've also noticed a slight stumble even after it is warmed up, so I'm thinking I've got an accelerator pump failure. My question is, is there any way to determine which carbs (and hopefully the jetting for the 421)? I want to make the proper selection from your rebuild kits and possibly new jets as well.

Thanks in advance and Happy Holidays.

The Rotax MAX Jetting Guide App is designed to assist users with setting up the recommended main jet based on the ambient conditions and the type of Rotax MAX evo engines (Rotax 125 MAX evo, Rotax 125 Junior MAX evo, Rotax 125 Mini MAX evo, Rotax 125 Micro MAX evo, Rotax 125 MAX DD2 evo). The perfect set up can be calculated in two ways, either automatically which requires a GPS signal and an internet connection or by manual input of the data of ambient conditions and engine model.

Automatically: 1. Click on the white button located at the top of the screen saying “USE GPS POSITION FOR WEATHER DATA”. After a short moment the App will automatically provide all the necessary information regarding weather and geographical position.

As a second step, the engine type of the kart needs to be selected. Therefore the button underneath the weather data needs to be clicked.

The App will automatically show all potential Rotax 125 MAX evo engines from which one can be selected by clicking on a certain engine type. After all the necessary information has been provided and selected, you only need to click the circular red button saying “CALCULATE” at the bottom of the screen. Now the recommended Main Jet value will be provided. Modern Siren Program By Rori Raye Reviews.

In case a second calculation needs to be made, you can start over by simply pressing the button saying “RESET” next to the calculated value. In case no GPS signal or Internet connection is available, the necessary data needs to be added manually, which of course requires knowledge about current weather conditions at the race track as well as the altitude. By clicking on the empty space next to “Temperature”, “Altitude”, “Atmos. Pressure” and “Humidity”, you are able to enter the required information.

In terms of “Atmos. Pressure” the atmospheric pressure at sea level has to be entered, usually the barometer shows the actual level. As a second step, the engine type of the kart needs to be selected. Therefore the button underneath the weather data needs to be clicked. The App will automatically show all potential Rotax MAX evo engines from which one can be selected by clicking on a certain engine type. After all the necessary information has been provided and selected, you only need to click the circular red button saying “CALCULATE” at the bottom of the screen.

Now the recommended Main Jet value will be provided. In case a second calculation needs to be made, you can start over by simply pressing the button saying “RESET” next to the calculated value. Additional Information: • In case values are being entered manually, the provided numbers will turn from white to red if they are considered to be unrealistic values. • Depending on their preference, users can decide if they would like to use the metric or the imperial system.

The user can change between Celsius and Fahrenheit by simply clicking on the small °C or °F next to the value for temperature. The same works with Feet and Meter, where the user can just click on the small m or ft located next to the value for altitude in order to change between the systems. • On the top right corner, you can find a button called “INFO”. By clicking this button additional information about the app as well as setting up the carburetor can be found like float height, position of the jet needle or the air adjustment screw.

By clicking the small red X underneath the info button, you can return to the home screen.