What kind of carburetor does a Sportster use?
From 1989-later, the carburetor installed on Sportsters was made by Keihin. It has a 40mm maximum venturi, but the design of the constant-velocity carb utilizes a vacuum-operated slide to vary the venturi opening to help maintain a proper air velocity throughout the carbs operating range.
How does carb effect throttle positions on a motorcycle?
Motorcycle carbs have a few circuits that effect different throttle positions. Pilot Circuit – small effect on idle. Higher effect at lower RPM’s with decreasing effect to full throttle Main Jet – Wide open. Fuel is metered through the main by the jet needle at different throttle positions.
What are the symptoms of lean carb settings on a motorcycle?
Cold starting and warm up. Reduced Power – Sluggish at certain RPM’s. Wide open throttle yields no power. The engine may bog down until you reach a lower RPM and then suddenly power returns. Spark plugs are clean – No residue. Insulator may be white.
What does it mean when your engine sputters at full throttle?
Sputtering: This isn’t exactly a technical term but is commonly used to describe how an engine runs when jetted too rich. For example, using too large of a main jet will cause more fuel to enter the combustion chamber than it can efficiently burn. This will result in a “sputter” at full throttle.
What kind of carburetor does a Harley Davidson use?
However – and this is important – at idle and above ¼-throttle the jetting is pretty good. Harley’s Keihin CV (constant velocity) carburetor is based on the basic Amal slide carb design from the early post-World War I era.
Is the rejetting stock CV carb stock Harley Davidson?
Rejetting stock CV carbs Stock Harley jetting is very lean from just off idle to about ¼-throttle. This is also true of all road-going bikes sold in America for the last quarter century. However – and this is important – at idle and above ¼-throttle the jetting is pretty good.
Why are my carburetors not working on my motorcycle?
Fixing Lean Mixtures. This condition is generally caused by the incorrect fitting of after-market accessories such as exhaust systems, air filter systems, or replacement carburetors of a different type or size. In addition, if the fuel level in the float chamber is set too low, insufficient fuel will be drawn through the main jet.
What happens when a carburetor is running too lean?
Too Lean When a carburetor is running lean, the fuel-to-air ratio is off because the carburetor is delivering too much air. Typical symptoms of a lean mixture are: Backfiring as the throttle is closed (primarily during coast-downs)
What is the purpose of a carburetor in a jet engine?
The purpose of the carburetor is to atomize fuel into the incoming air such that a proper air-fuel-ratio (AFR) is achieved for varying conditions. The Slow Jet (AKA Pilot Jet) & Main Jet each use an emulsion tube with a fuel orifice & air holes.
Where does the fuel come from in a carburetor?
Each emulsion tube pulls fuel from the float bowl reserve and is fed air thru small air ports (called air jets) on the face of the carb (filter side). In each case, the emulsion tube produces an air/fuel mixture that is further mixed with the air flowing into the venturi (carburetor throat).
How to check the carburetor and intake manifold?
Check the Slide Diaphragm – Be sure the slide operates correctly & the diaphragm is not torn or punctured. To do this, remove the air cleaner and reach your finger into the carb throat to the slide – push the slide up and quickly let the slide fall down.
From 1989-later, the carburetor installed on Sportsters was made by Keihin. It has a 40mm maximum venturi, but the design of the constant-velocity carb utilizes a vacuum-operated slide to vary the venturi opening to help maintain a proper air velocity throughout the carbs operating range.
Are there any Sportster breather kits left in stock?
Only 10 left in stock – order soon. . . Only 12 left in stock – order soon. . Only 3 left in stock – order soon. . Only 7 left in stock – order soon. . Only 4 left in stock – order soon. . Only 10 left in stock – order soon.
Each emulsion tube pulls fuel from the float bowl reserve and is fed air thru small air ports (called air jets) on the face of the carb (filter side). In each case, the emulsion tube produces an air/fuel mixture that is further mixed with the air flowing into the venturi (carburetor throat).
The purpose of the carburetor is to atomize fuel into the incoming air such that a proper air-fuel-ratio (AFR) is achieved for varying conditions. The Slow Jet (AKA Pilot Jet) & Main Jet each use an emulsion tube with a fuel orifice & air holes.
Contrary to popular folklore, all Keihin non-CV carbs did come with accelerator pumps. In 1988, the stock Sportster carburetor was upgraded to a Keihin 40mm, slide-type, constant-velocity model. It was quickly discovered that the lack of an accelerator pump was a shortcoming.
Can you knock off a Harley Davidson carburetor?
There is no guarantee that any part (original or CVP) will fit those knock-off carburetors. If your CV carb does not have the name Harley Davidson cast above the bowl on each side it is a knock-off. The carburetor atomizes gas in proper proportions to the air pulled in through the air intake.
What is the CARB stamping code on an 86 Sportster?
The kit Number is 29081-90C for 86 and later Sportsters. Carb stamping is (27FA) plus a 4 character date code. Required possible grinding of the right rear corner of the front cylinder head, due to interference with the carburetor throttle pulley and cable guides, for proper clearance 16)
What kind of carburetor does a Keihin use?
The Keihin non-CV carburetor is a horizontal type with a fuel bowl, single ring-shaped float, an accelerating pump, idle mixture adjusting needle and a throttle stop screw for speed adjustment. 1) The throttle body casting contains an integral venturi and a fuel valve seat that is pressed into the body.
Contrary to popular folklore, all Keihin non-CV carbs did come with accelerator pumps. In 1988, the stock Sportster carburetor was upgraded to a Keihin 40mm, slide-type, constant-velocity model. It was quickly discovered that the lack of an accelerator pump was a shortcoming.
What’s the name of the Harley Davidson carb rebuild?
Harley Davidson Keihin EVO Carb Rebuild and Repair – YouTube Jordan and Ben team up to save the world from the savage effects of ethanol one carburetor at a time while battling the evil forces of Kuryakyn, destroyer of…
The kit Number is 29081-90C for 86 and later Sportsters. Carb stamping is (27FA) plus a 4 character date code. Required possible grinding of the right rear corner of the front cylinder head, due to interference with the carburetor throttle pulley and cable guides, for proper clearance 16)
There is no guarantee that any part (original or CVP) will fit those knock-off carburetors. If your CV carb does not have the name Harley Davidson cast above the bowl on each side it is a knock-off. The carburetor atomizes gas in proper proportions to the air pulled in through the air intake.
How big is the s and s Super E carburetor?
S&S Super E (1 7/8″ Carburetor) Initial Jetting Settings Engine Size 74-86 CID S&S Super E Idle Mixture 1 1/4 To 1 3/4 Turns S&S Super E Intermediate Jet .028 To .033 S&S Super E Main Jet .068 To .078 Engine Size 86-98 CID S&S Super E Idle Mixture 1 1/4 To 1 3/4 Turns S&S Super E Intermediate Jet .031 To .036 S&S Super E Main Jet .072 To .086
What was the name of the 1981 Harley Davidson Sportster?
While other bikes required the gratuitous downshift, the Sporty only needed a tweak of the throttle and it would give you what you wanted. There were, of course, some minor problems with the 1981 Sportster edition, but those things were easily rectified by Harley.
How big is a Sportster carburetor jet engine?
Sportster Carburetor Jet Sizes. KEIHIN CARBURETOR MAIN JET SIZES 1988 TO 2006. Year 1988 Engine 883 – Jet Size 170 (California 165) Year 1988 Engine 1200 – Jet Size 200 (California 180)
What does the s & s Super E carburetor kit include?
The complete S&S Super E carburetor kit contains everything you need for a complete installation on Harley-Davidson models with standard tanks. This kit includes a Teardrop air cleaner and a manifold for engines with stock length cylinders. 1-7/8″ bore.
What should the jetting be on a S & S carburetor?
These are the jetting recommendations for S&S carburetors for various engine sizes. The jetting in your carburetor should fall within the ranges indicated within the chart. .082 to .
Why does my Sportster backfire all the time?
Hi Anonymous, popping, coughing, spitting, or backfiring through the carburator or induction module is usually caused by air getting sucked in combustion chamber do bad intake seals leaking. Leaking exhaust gaskets can also be suspect.
What causes exhaust to pop when letting off throttle?
Plugged slow jets not uncommon (and that can cause other major problems. If the bike never did it, sat a long time and started popping, that’s more of a possibility). Incorrect air screw settings can sometimes cause it, I’ve been able to tune it out (or hide it..) with an air screw adjustment in some cases.
Why does my car stumble when I open the throttle?
If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.
What should idle speed be on Harley Davidson Sportster?
Evo Motors should idle at a minimum of 700 rpm and Twin Cams at 900 rpm—they sound great idling at lower revs than this, but it can cause premature wear on your valve train. This article does NOT cover idle mixture—that is something else—we are just looking at simple idle speed adjustment here.
Why does my car hesitate when I open the throttle?
Engine Hesitates, Stumbles, Lacks Normal Power. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture, and when extra fuel is needed if the throttle suddenly opens wide.
What causes carburetor to pop on Harley Davidson?
The gaskets between the head pipes and the exhaust ports of the heads is a crush fit that will leak if the pipes are removed, reinstalled, or over/under torqued. Cool air drawn into the exhaust at these seals will result in hesitation or popping commonly misdiagnosed as a carburetor problem.
Three different carburator families were used on the K and Sportsters through 1969. Three models of the venerable Linkert Model M carbs were used on K and KH. Sportsters used various incarnations of the Linkert DC and M carbs from 1957 through 1965.
Where is the carburetor on a Harley 45?
The Linkert DC found on the 1959-1965 Harley Servi-car 45 flathead was left-handed, the float was on the right side of the ones put on Sportsters and Big-twins, since Harley flatheads have the carburetor on the left side of the engine.
How does a model M carburetor work?
The model M carburetor is a plain tube carb containing a venturi and a discharge nozzle through which fuel is drawn into the air stream passing through the venture. The quantity of fuel is metered by two jets or openings (one for low speed and the other for high speed) before entering the nozzle.
What kind of carburetor does an IH HD have?
The model HD is a dual-venture, diaphragm-type carburetor with an automatic economizer and accelerating pump. The fuel inlet needle is operated by a compression spring balanced lever that is controlled by the diaphragm to regulate fuel flow into the metering chamber.