Question about Honda CB 750 Motorcycles

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I'm having trouble get the intake runners back into the air box so i can attach it to the carburetors. Is there a trick to help make it easier?

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Do you mean the short rubber intake pipes between air box and carbs ? if so then number each one and make a note of angle they sit , remove them and put in hot water untill feel soft then fit back in , also loosen air box b4 this and they should be easier to push on , bit fiddly but should go on now ! If the pipes wont come off try a hair dryer ! P...

Posted on Dec 31, 2013


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Jan 16, 2013 | Air Intake & Fuel Delivery for Chrysler...

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    • 1 Remove the seat by unscrewing the bolts found on the four corners of the seat. Remove the clamps from the top of the air box using a pair of pliers to access and remove the air filter. The air filter is removed by unscrewing the wing nut and sliding the filter out of the box. Loosen the hose clamp that connects the carburetor to the intake manifold, using a screwdriver.
    • 2 Loosen the fuel delivery hose clamp with a screwdriver and pull the carburetor out of the Blaster. Before troubleshooting the carburetor, it's important to note whether you've made a significant change in altitude or a change in your exhaust/intake setup. If you've made an altitude change, installed an aftermarket exhaust pipe or modified your air box, the jets will need to be changed. Refer to your manual for specific re-jetting instructions based on your altitude. Your exhaust kit will provide a recommended jetting setup. Do-it-yourself modifications like removing an air box will require you to experiment with the jet setup until you find the right one.
    • 3 Disassemble the carburetor by unscrewing the bowl screws from the bottom of the carburetor. With the bowl removed, the float, pilot jet and main jet will be exposed. To remove the pilot and main jet, unscrew them from their respective holes. The main jet will sit in the exact center of the bowl, while the smaller pilot jet will be set just below the main jet.
      Use a blunt object like a stick or rod to push the bottom of the needle receiver assembly out of the carburetor. The needle receiver (which houses the needle jet) will slide out of the top of the carburetor along with the slide, spring, carburetor cap and gasket. The carburetor is now completely disassembled and ready to be inspected.
    • 4 Inspect the pilot jet for blockage, slide a thin wire through the pilot jet's hole, spray it with carburetor spray and blow the center hole with compressed air. Repeat this process with the main jet. If there is any blockage or wear, replace the jets. If you have made altitude changes or exhaust/intake modifications, insert jets that correspond to your changes as recommended in your manual. Note that this may take some experimentation with different jets to get the correct jet setup, as there are many jet sizes for different scenarios.
    • 5 Inspect the bowl, floats and ports for any signs of debris or gunk. If debris or gunk is found, remove it using a spray carburetor cleaner, soft wire brush, or thin wire (to insert into small orifices). If no gunk or debris is found, you've ruled this out as a possible cause for the starting issues, and can focus on the replacement of carburetor components.
    • 6 Look for abnormal wearing on the jets, float valve, gaskets, O-rings and springs. If you have not changed altitude or modified your bike in any way, then it is best to inspect these components. Any one of these components, or a combination, may be contributing to your starting issues. You may choose to replace individual parts such as a new float valve, though replacing all the interior components with a carburetor "rebuild kit" is advised. Rebuild kits can be ordered online or through your dealer, and will ensure your carburetor is fully repaired.
    • 7 Slide the gasket, spring, spring holder and needle jet assembly back onto the carburetor cap and insert the assembly into the top of the carburetor. Screw the main jet into the bottom of the needle jet assembly by accessing it through the bowl area. Screw the pilot jet back into its hole below the main jet. Clip the float valve onto its hinge within the bowl a insert the bowl gasket. Screw the bowl to the bottom of the carburetor to complete the re-assembly process.
    • 8 Re-attach the carburetor to the intake manifold using the hose clamp and screwdriver. Slide the fuel feeder line onto the brass receiver port on the side of the carburetor and slide the air box boot over the carburetor's intake port, which should be facing toward the back of the bike. Re-install the air filter with its wing nut, slide the clips over the air box top to secure it to the box and slide the seat into place. Re-install the seat screws to complete the re-assembly process.
    • 9 Prime the carburetor by twisting the throttle once and start the Blaster.

Jan 14, 2013 | Yamaha V Star 1100 Custom Motorcycles

2 Answers

How to replace a intake plenum gasket

Well basically, you remove the intake plenum and replace the gasket and reinstall the plenum. Here are the steps:

1. Disconnect the negative battery cable from the remote jumper terminal located at the right strut tower.
2. Remove the air inlet resonator and tube.
3. Remove the throttle actuator cables from the throttle arm and bracket.
4. Disconnect Secondary Runner Valve (SRV), Manifold Tuning Valve (MTV), Throttle Position Sensor (TPS), Idle Air Control (IAC) motor electrical connectors.
5. Remove the electrical connector and the Intake Air Temperature/Manifold Absolute Pressure (TMAP) sensor.
6. Disconnect vacuum hoses from the Secondary Runner Valve (SRV) reservoir, Speed Control reservoir, and PCV.
7. Remove right and left intake manifold supports.
8. Remove support brackets at the intake manifold front corners and MTV.
9. Loosen upper fastener attaching throttle body to support bracket.
10. Remove clips attaching EGR tubes to intake manifold.
11. Remove intake manifold bolts and manifold
12. Remove old gaskets, Clean gasket surfaces, and install new gaskets.
13. Reverse steps to reinstall manifold

Jun 16, 2012 | 1999 Chrysler 300M

1 Answer

I just replaced the cable to my IMRC box on my 97 Mercury Sable and it engages as soon as I turn on the car or when I rev the motor above 2500 rpm. What could have done wrong or didn't do when I put it...

intake manifold runner control has linkage about 3 inches long and is attached to the end of the manifold. never knew of one with a cable. but the box is suppose to move the linkage with the key on to run a check on the engine and it is suppose to open the intake runners at and above 2500 rpm's to induct more air onto the intake at heavy acceleration.

Jun 06, 2012 | 1997 Mercury Sable

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I have 8 throuble codes p0743,p1537,p1504,p0133,p0420,p0113,p0122,p1506,please help i don't know what to do to windstar 98 3.8


Intake Manifold Runner Control Stuck Open


Intake Air Control circuit malfunction


Idle Air Control Over Speed Error

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P0113 Intake Air Temperature Circuit High Input

P0133 02 Sensor Circuit Slow Response (Bank 1 Sensor 1)

P0420 Catalyst System Efficiency Below Threshold (Bank 1)

P0743 Torque Converter Clutch Circuit Electrical

I hate to hear you are havine so much trouble. These are a basic descrition of each of the codes.

If each of these codes are active, i would imagine you windstar isn

Jun 16, 2011 | 1998 Ford Windstar

1 Answer

I have a 78 yamaha xs650 bobber on a rigid and although it runs great the carbs sometimes dislodge themselves. The way they're attached from the factory with only a rubber boot and hoseclamp obviously...

It is not that the carburetors were designed to hang from the intake manifold boots. There were supported and held in place by the air box . Sandwiched between the air box and intake manifolds . You could probably design a hanger that would drop down and go between the carburetors and grab the intake side with hose clamps or pull ties to support the weight.

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1 Answer

How does the gasket of a 2000 harley davidson fatboy fit into the intake valve?

I'm really not sure what you're asking. There is no gasket in the intake valve. Now, if you are talking about the intake manifold gasket at the heads, you need to look at the plates that are on the intake manifold themselves.

There is a plate on each runner of the intake. These plates are marked with a "R" for Rear and a "F" for Front. One side of them is flat with the other side having a "counterbore". The "counterbore" goes towards the head with the gasket sliding up on the manifold so that it's shape fits up into the counterbore. When the plates are tighened down, they flatten out the gaskets and form a seal against the head and the manifold.

Now, you must align the manifold when you put it on. Do not just put it on and tighten it up. Install the manifold but leave the bolts loose. Then install a new carburetor seal on the carb end of the manifold and install the carburetor into the manifold. Bolt the backing plate of the air filter to the carburetor and the heads. No need to connect the fuel line or cables because you are simply aligning the manifold at this point. With the carb and rear plate of the air filter bolted in it's place, then tighten the manifold bolts. This insures that you will not have a vacuum leak at the carburetor seal by aligning the manifold with the carburetor and air filter. I hope this answers your question. Good Luck and ride carefully.

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I got a code 1537 and 1538 showing on my obd2 reader it says intake runner manifold control stuck open in bank 1 and bank 2 i replaced both and still have the same problem truck has a bad miss in the...

I'm assuming you have the 4.2l v6. If this is the case, there are two intake runners per cylinder, one long (torque) one short (horsepower), default setting for these would be long runners or closed. 
There is a valve so to speak inside the intake manifold operated by a motor that switches to the short runners when the RPM"s reach a preset point. However there has been a problem with this design, not only with the 4.2's, but the 2.5's and 3.8's and every other motor that uses this design. 
The motors go bad, or the valve gets carboned up and no longer moves. If you have a 4.2 start there, if not I'm not sure what is wrong.
Good luck and hope this helps

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