Cushman carburetor adjustment

We get a lot of questions about what causes a gas golf cart to backfire and how to solve that problem. It is usually an adjustment issue and relatively easy to remedy. In almost all cases, whether it is a 2 cycle or 4 cycle engine, golf cart backfiring is caused by the accelerator cable being out of adjustment at the throttle plate of the carburetor.

This problem has a relatively simple cure. With the ignition key in the OFF position and the seat completely removed, press the accelerator pedal down. Depending on the golf cart brand and model, this accelerator micro switch may be located around the pedal itself or possibly mounted to the inside of the front wall of the engine compartment.

Once you identify where your accelerator micro switch is located, press the accelerator pedal down again and listen for its click, while looking at the carburetor throttle plate. For proper symbiosis between the fuel and ignition systems, the accelerator micro switch must click BEFORE the throttle lever of the carburetor moves.

The accelerator cable may move through the plate, but the plate itself cannot move prior to the micro switch click. If you find the throttle plate moves prior to the click, you will need to make adjustments. The needed adjustment to remedy golf cart backfiring will vary between manufacturers and year models. Be sure to double check your adjustment against the micro switch click for good measure. Other golf carts may not have accelerator cables, but rather system of rods between the accelerator pedal and the carburetor.

In this case, you generally have to adjust the length of the last accelerator rod before the carburetor to allow the throttle plate to close fully. As above, always be sure to check your adjustment afterwards to ensure proper function.

You must be logged in to post a comment. English skit on teamwork site uses Akismet to reduce spam. Learn how your comment data is processed. More often than not, golf cart backfiring is caused by the throttle plate inside the carburetor being slightly open. This allows fuel to flow into the cylinder before the ignition system is activated to produce a spark for combustion. Instead of igniting a small amount of fuel when working properly, a larger amount collects and you get a significant explosion, which is called a back fire.

For the fuel and ignition systems to work properly together, the spark should be in the cylinder via the plug prior to fuel gets there. By Michael Williams. Log in to Reply. Leave a Reply Cancel reply You must be logged in to post a comment.Want to get all the tech tips faster and have archived for future projects? Aluminum is easier to work with for me. The hole pattern was designed by tracing it from the kick starter three-hole flywheel pattern.

Hex screws. The large hole in the center fits very closely right up to the crank threads. Aluminum helps here too! The three tapped holes give a place to store the screws and flat washers. It was easier to tap using a slightly oversize tap drill from normal. I asked a lot of questions about carburetors and different things. You suggested I purchase some of the special issues and the engine book by Jim Frederick.

I have since determined that my scooter is a Model 54 and not a Model I purchased two special issues from Bob Cantrell that provides a lot of info on both models. Quite informative! Thanks for the help…the books are a good buy!

Tech Answer Dan, I can almost always suggest that a member, especially a new member, obtain material covering their scooter. And you quickly learned what scooter you actually had. I find that many people are not aware of the many different Cushman models. Part of the fun is learning about your scooter and others. I would like to go with a standard golf tire if possible. Tech Answer The Terra Tires were very wide with low pressure iron and were extremely heavy. They were also extremely hard to work on as they were nearly a foot wide.

I am guessing that replacement tires would be near impossible to find. Most of these golfsters were sold equipped with more conventional wheels and tires. The front fork is special for these wide terra tires but can work with other tires.

I suggest you study your golfster and compare it with ones having the more regular tires to determine which items you need to change. Manuals, hubs, rims and tires are listed for sale occasionally. Check with Robert Cantrell for a manual, too. How can we tell if it is getting gas to the cylinder?

Try to start it, then pull the plug. Hold the plug in one hand and smack it and your hand into a clean piece of paper in the other hand in a clapping motion to see if any fuel is to the plug. It was equipped with split washers under the head bolt nuts with no flat washers and had a blown head gasket.Base line Settings.

Golf Cart Backfiring: Causes & Solutions

Your settings with engine running. It is important to follow all linkage and lever installation instructions. The number one and two reasons for tuning errors are improper linkage installations and over tightened linkage nut, causing a binding in linkage assembly. Start set up by confirming carb base line settings.

Do not depend on the factory delivered settings. Check them before the carb is installed. All settings are done with choke disengaged or warmed up so that the choke is fully opened and disengaged. This is done on automatic choke carburetors by first opening the choke butterfly by hand and inserting a wood block or wedge of some kind to hold open while the linkage is cycled linkage operated through its full movement to clear the choke cam. You will hear a metallic click as the cam is released.

You can check the fast Idle screw under the choke assembly to confirm that it is not in contact with the choke fast idle cam. Cycle the linkage again to be sure that the linkage comes to close without any assistance. Set the mixture screw see Fig 1 by first screwing in until the screw stops, bottoms out. Back out the screw 2 full turns. Simple Rules for low speed calibration.

If the speed screw has to be opened 2 or more turns then this is also an indication of a lean condition usually requiring greater change. At times it may appear to be showing signs of richness or flooding it is really a lean condition.

See pictures and notes in the tech 2 article supplied in the kit instructions, view and please understand the need to keep throttle plate as near to closed as possible so as not to prematurely expose the transition holes.

This is what causes the visible rich condition, and confirms the need to increase the jet size. Achieving the best idle at under 2 turns indicates the need for a smaller idle jet. The Weber Carburetor is a sequentially timed device to the motor like the distributor. Time taken in the setup will provide more fun later. Technical assistance is free for the first 60 days of purchase. Units in service over 60 days may be assessed a service fee. All charges will be noted up front after a brief consultation to determine any possible defect.

If the carb is out of the warranty period and no defect is determined we will estimate the possible cost of tech support or recommend literature available that may help.

Start the engine, the engine will run very slowly more like a tractor. As long as the engine stays running idle speed is not important at this point. The first thing to do is not set up the idle speed, but to set the Idle mixture screw to lean best idle setting.

The engine should pick up speed and begin to smooth out.

cushman carburetor adjustment

Use your ear, not a scope or tuning instruments at this point. You want to tune the engine by sound. Adjust to best, fastest and smoothest running point. Now that the mixture screw is at its best running location, you can adjust the Idle speed the screw. Check and set idle to your driving preference. Recheck timing and vacuum hook ups. Recheck mixture screw to lean best idle again.

cushman carburetor adjustment

If all is still best and smoothest idle then confirm and note the final settings. To confirm settings with the engine running.Jim's Cushman Scooter Site. Cushman Hints and Tips Page. Cushman Club Of America Information. Jim's Engine Overhaul Manual. New Content. Historic Information. Cushman Model ID. Vanguard Center. Cushman Time Line. Cushman Pictures. Truckster Pictures.

Other Scooter Pictures. Cushman Dealers. Cushman Literature. Links Page. Cushman Show Pictures. Your contribution to this page will be appreciated.

Credit will be given for all submissions accepted. Click HERE to submit a tip. Much has been written over the years about Cushman's downfall due to the two speed transmission, especially when imports came in with three and four speeds.During these challenging times, we guarantee we will work tirelessly to support you. We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what.

Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities.

We will get through this together. Updated: July 4, Reader-Approved References. Finding the correct air and fuel mixture will help extend the life of your engine. If your engine is running too rough, it's important to adjust the mixture and find the correct idling speed to decrease engine stress, keeping things from running too fast or too slowly.

Adjusting the carburetor in your car can be done with just a few simple steps and no special tools. Then, start your car and let it warm up. When it's at running temperature, find the 2 screws on your carburetor that adjust the air and fuel mixture.

To adjust your idle speed, find the idle mixture screw that limits the flow of fuel at idle. Give it no more than half a turn clockwise, adjusting it just until your engine idles smoothly. To learn how to tell whether your engine is running lean or rich and how to correct it, read on! Did this summary help you?

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Create an account. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy.In this EZ GO Golf Cart carburetor troubleshooting section you can interrogate the troubleshooting tables to diagnose your carburetor issue. Should you need replacement parts you can find them in our EZGO parts section. Replace as required. If damaged replace. Find how to diagnose your golf cart engine problems in this EZGO Golf cart engine troubleshooting section.

Replace if faulty. Start motor terminals loose or corroded Clean and torque Electrical ground fault Inspect for damage and continuity. For all your electrical motor issues please match the symptoms to the probably cause. This will allow you to correct the problem with your EZ GO goft cart electric motor. Also test each coil to ground testing for short. Repair or replace motor as required. In this section you can use the brake system troubleshooting flow charts or tables to identify the problem with your EZGO Golf cart brakes.

If you need to replace parts please use out EZ GO parts page and identify your vehicle. Welcome to the EZGO suspension and steering troubleshooting section where you can diagnose and fix your steering or suspension issues. Symptom Cause of Problem How to fix It Tire Wear Uneven Tire pressure incorrect Inflate all tires evenly to correct pressure Wheel alignment poor Align wheels Stiff Steering Water has frozen in steering box Pull appart steering column, pinion and bearing and remove all water.

Change gasket seal. Reassembly and apply grease. Too much grease in steering box causing migration into steering rack bellows Raise cart and inspect rack bellows when moving the steering from lock to lock. If bellow distortion exists, remove the bellows and drain excess grease. King pins, tie rod ends, idler bushing, rack tensions or steering box require lubrication Apply little grease and test steering. Keep adding grease until steering is free and smooth.

Do not overfill with grease rack bent Remove rack and place on a known flat surface. Use a feeler gauge between the rack and flat surface. If unit is already torqued, replace steering wheel. If not then torque wheel nuts.

Worn steering components Replace Wheel bearings loose Adjust or replace Excessive vibration Worn steering components Replace Wheel bearings loose Adjust or replace Tires, wheels or brake drums have lost their roundness Check and replace all out of round components Lug nuts loose Torque to ft. Lbs Nm Steering pulls to one side Tire pressure incorrect Inflate to correct pressure Wheel brakes dragging Carry out maintenance on brake system Failure of suspension system components Repair Incorrect wheel alignment Align wheels.The Tillotson carburetor is used on small engines designed primarily for go-carts.

You can adjust the carburetor in just a few minutes. The carburetor uses a low-speed and high-speed set screw that you can adjust fairly easily with just a screwdriver. The high-speed set screw includes a "T" on the end, allowing you to adjust the screw by hand. Locate the idle set screw at the very bottom of the Tillotson carburetor. Turn it clockwise with a screwdriver until you completely close it without over-tightening the screw.

Find the low-speed adjustment screw with the "L" next to it on the carburetor body. Turn the low-speed screw all the way clockwise and back it out counterclockwise one and a half turns.

How to Adjust a Tillotson Carburetor

Locate the high-speed adjustment screw with the "H" on the body. Turn the high-speed screw all the way clockwise and back it off counterclockwise three-quarters of a turn. Start the motor and let it warm up for a few minutes.

cushman carburetor adjustment

If the engine is having trouble starting, adjust the low-speed screw just a bit to get it started. Turn the low-speed screw until you can hear the motor slow down. Adjust the screw as slow as you can get the engine to run without stalling out.

Open the carburetor throttle all the way and adjust the high-speed screw as high as it will go while still running smoothly.

Correct Way To Adjust Or Tune The Carburetor On A Weedeater / Grass Trimmer - Video

Turn the high-speed screw back one-eighth and shut off the engine. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Locate the idle set screw at the very bottom of the Tillotson carburetor.

Step 2 Find the low-speed adjustment screw with the "L" next to it on the carburetor body. Step 3 Locate the high-speed adjustment screw with the "H" on the body. Step 4 Start the motor and let it warm up for a few minutes. Step 5 Turn the low-speed screw until you can hear the motor slow down.

Warning To avoid burn injuries, be careful when adjusting the hot carburetor while it is running as well as moving engine parts in which clothing can get caught. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.