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Found 12 results

  1. I have a 1996 King Quad 300 LT-F4WDX ATV I tried to install a carburetor rebuild kit but there were no instructions and I am unable to find them. Anybody know what the "Pilot Screw" is set at? The engine starts but seems to be flooding- very difficult to get the rpms up and engine acts flooded. I set the screw to 3 turns from closed. It is called the "Pilot Screw" on exploded views of the carb. It is a Mikuni BST 31 single carb. Thanks for any help! Bill Roberts
  2. I was just given a 1996 wolverine for Christmas from my father in law, needs a new carb. The cheapest that I can find a new one is $500, looks like it's an oddball carb. Is it possible to use a warrior carb which is a lot less expensive and more available? I found an aftermarket wolverine carb for like $170, anyone had any luck with these? Thanks!
  3. Hello to all, I am new to your site. Need to pick your brains, I recently bought and older quad for some work around the house. It runs alright but it looks like over the years some things have been cobbled up. My main thing is the carburetor, Its not the original mikuni it has some japan thing that has been modified to fit and it has been a pain. I want to put a mikuni back on it, the clymer manual shows the original as a vm22sh mikuni carb. Kinda hard finding one, I was thinking of going that way, then rebuild it. Or can I get another vm22 model and put on it, or will that be more of a problem? I have been seeing them on ebay for about $75 I have noticed the jetting is really different then what they are calling for in the manual. Any help would be appreciated thank you. Once again this is for a 86 yfm 200.
  4. What are the starting point settings for the carb for this machine? Thanks Bruce
  5. When I get to mid throttle (slide is 1/2 way up) the engine sputters. All other ranges are fine. It all started back when my gas cap was not tight and all the gas evaporated. Sputter problem has remained since then. If I fully clean the carb, install it, it runs good, but the next day, the sputter returns. When it is cold, no sputter, but returns as engine warms. When the peocock valve is turned off, the sputter stops, then it runs out of gas (that tells me the sputter is caused by running to rich, right?). Things I've done but problem returns. -disassembled carb (about 10 times) and cleaned all jets, passages, rechecked float level -ran without air filter -changed to smaller jets (main and pilot) -moved needle valve to next leaner position -set float level too hight and too low -cleaned peacock and inline filter -ran with gas cap loose -checked spark plug--black with a little bit of white My only idea now is that the plastic around the needle jet has deteriorated causing it to run rich. I don't have a smaller needle jet, but adjusting the needle position didn't do anything. Ideas? Thoughts? Thanks. Jim
  6. What makes the value piston work up and down. Its will run idle but when you give it the gas the piston in the carb will not move up. First time to ever work on carb on this type atv. Need help Please. This is a 2005 Suzuki Quad Vinson 4x4. Thanks Mowerman
  7. My dad said if I wanted a four wheeler I had to build it. Well it took me over a year to do it but now I am having troubles with the carubretor. My dad and I tried to rebuild it and we took our time doing it but the problems we are have are: we are getting exhaust blow out of the carburetor and exhaust out of the tailpipe it back fires at a high rpm and when we put the air box on the carburetor we have no acceleration. We have stop at a couple dealerships but they don't work on anything as old as my 88 warrior and have no idea. Can anyone help please. You can email me at [email protected] Tags: Rebuilt Engine Carburetor
  8. My dad said if I wanted a four wheeler I had to build it. Well it took me over a year to do it but now I am having troubles with the carubretor. My dad and I tried to rebuild it and we took our time doing it but the problems we are have are: we are getting exhaust blow out of the carburetor and exhaust out of the tailpipe it back fires at a high rpm and when we put the air box on the carburetor we have no acceleration. We have stop at a couple dealerships but they don't work on anything as old as my 88 warrior and have no idea. Can anyone help please. You can email me at [email protected] Tags: Rebuilt Engine Carburetor
  9. Can anyone direct me to a place where I can buy a carb rebuild kit for my 2005, arctic cat, 400, 4X4 ? I have been searching the internet and I can't find the kits for any arctic cats... Thanks for any assistance.
  10. I have just recently purchased a 1998 artic cat bearcat 454 2x4! It had been sitting up for about 2 years and needed some major work! I replaced the cdi unit and regulator and freed up the brakes! Now I was breaking down the carb, cleaning the jets and all and noticed that one of the ears that hold the float in place has been broken off!! I opoxyed it back on, and everthing seems to be fine now! But as I was looking for carbs I can't find an aftermarket carb anywhere! A brand new one is from 400 to 500 bucks and I can't find a used one! Does anyone know a different brand or an aftermarket carb I can use on my 98 bearcat 454?? Thanx alot!!
  11. Carburetor Theory Whether carbureted or injected, the fuel system is designed to provide the optimum mixture of air and fuel to the engine under varying conditions. This optimum air/fuel ratio (do not call it the fuel/air ratio!) is called the stoichiometric ratio and in theory is approximately 14.7 parts of air to 1 part gasoline (14.7:1) based on weight, not volume. However, this air/fuel ratio must be modified under different atmospheric and running conditions. A ratio numerically higher than 14.7 would be considered a lean air/fuel mixture, numerically less than 14.7 would be considered a rich mixture. There are several principles of physics that affect the design of carburetors. Among these are; a liquid will take the shape of the container it is in liquids are not compressible liquid in two containers joined with a passageway will be at the same level if the atmospheric pressure above them is the same air will flow from a high pressure area to a low pressure area to try and equalize the imbalance air flowing through a restriction in a passageway (the venturi of a carburetor) will increase in speed and decreases in pressure at the point of restriction a liquid can be atomized and vaporized There are three basic types of carburetors, fixed venturi, mechanical slide and constant velocity (CV). Despite their differences, they all use the Venturi Principle which states that air flowing through a restriction will increase in speed and decrease in pressure. It is the decrease in pressure in the carburetor venturi that allows atmospheric pressure to push fuel into the venturi through passageways that are machined into the carburetor body. These passageways contain jets that control the amount of flow through them. In order to burn properly and efficiently, the fuel must be first atomized (broken down into a fine mist) and then vaporized, that is, changed from a liquid to a vapor. When the air/fuel mist enters the combustion chamber, engine heat helps vaporize the fuel. However, when the engine is cold the fuel does not vaporize as completely, so we must supply more fuel so that enough of it is vaporized for the engine to run. This is the purpose of the cold start mechanism (commonly called the choke) used on carbureted engines. Carburetor Cold Start Mechanisms There are currently two type of cold start mechanisms used in carburetors, the choke plate and the enrichener. The choke plate pivots to block off some of the incoming air, while the enrichener adds more fuel. Both methods result in the same condition, that is, a rich mixture in the neighborhood of 3:1. A fuel injection system does this by automatically increasing injector duration, which is how long the injector sprays fuel into the combustion chamber. The longer the injector duration, the more fuel is sprayed into the engine and the richer the mixture. Running a carbureted engine that is at or close to operating temperature with the cold start mechanism on will result in a rich mixture when it isn't needed and can result in fouled spark plugs. Carburetor Circuits Carburetors are mechanical/hydraulic/pneumatic devices that have several functions. They allow us to change engine speed by allowing more or less air/fuel mixture to enter the engine, they help atomize the fuel for better vaporization, and they provide varying air/fuel ratios under different throttle positions. For an engine at operating temperature, there are three basic fuel circuits. Pilot Circuit Also known as the idle circuit or the slow speed circuit, it controls the air/fuel mixture while the engine is idling and up to about 1/8 throttle opening (it also flows fuel at larger throttle openings but the effect is negligible). Because of the small amount of fuel that is required at idle speeds, the pilot fuel passageway is restricted by the pilot jet. Carburetor jets (of any type) are usually made out of brass and come in different sizes. A number is stamped on the jet during manufacturing, the larger the number the larger the opening in the pilot jet and the richer the mixture would be. Because of the very small size of the opening in a pilot jet, is can easily be blocked by dirt, rust, stale fuel deposits or other debris. When this happens, the engine will not idle properly and the carburetor(s) will have to be removed, disassembled and cleaned. Mid-range Circuit As we open the throttle to accelerate, the carburetor allows more air to enter the engine, and there must be a corresponding increase in the amount of fuel flow. In most cases, this is accomplished by the use of a slide and jet needle, whether it is a mechanically operated slide or a vacuum operated slide. The jet needle raises and lowers with the slide and fits into a brass tube called the needle jet. Do not get confused between the two, the jet needle moves up and down while the needle jet is stationary in the body of the carburetor. The jet needle is tapered so that as it is raised in the needle jet, there is more space between the two and more fuel is allowed to flow. This circuit regulates the air/fuel mixture primarily from 1/8 throttle to about 3/4 throttle. Main Circuit As the throttle is opened approaching full throttle, the carburetor allows even more air to enter the engine and the main jet now controls the amount of fuel that is supplied. As with the pilot jet, it is usually made of brass, comes in different sizes and has a number stamped on it. Again, the larger the number, the larger the opening and the more fuel is supplied for a richer mixture. Larger main jets are often required with changes to the intake and exhaust of the engine. The opening in a main jet is much larger than a pilot jet and is less likely to be blocked or restricted. This circuit regulates the air/fuel mixture primarily from 3/4 throttle to wide open throttle.
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