Question about 1981 kawasaki KZ 1300 A3

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1979 KZ 1000, with four mikuni vm26ss. Pilot Fuel Screw located on the engine side, opp. air filters. In or out for air? Category section would not let me enter proper info.

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Those arent ajustment screws as the screws are in front of the float bowels in the center of each carb and they only trun a quarter turn unless the locks have been removed they'll keep turning with the blows off and they are likly to be dirty. Remove and wash out with carb cleaner and compressed air as all the other jets do too. The ones in the air horns too. Air screws are out 1 1/2 turns if the motor is in good shape' The screws in the sides are plugs that let you hook up your vacume gauges to sync the carbs. with all the vacume matched up then adjust the air jets then re sync the air then resync till any change makes it worse then ride it to see what you got their more senitive with the idle set low and it keeps to have a strong fan on the motor as sitting still with the motor out of tune till you get it right makes a lot of heat. When its right the sync gauges are on the same numbers and you hit the gas just some they all move together to the same number and hold RPM's just fine staying on the same numbers as if it won't do it the exhaust valves may be too tightand as it heats up everything changes and if you ride it it ca smooth out as the temp comes down with speed and the lash will open a little. Too tight and it changes too much to keep the tune.

Posted on Sep 07, 2009

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1997 Honda CA 125 Rebel carburetor tuning


Hi, Gus if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Carburator Theory and Tuning
http://www.mikuni.com/pdf/vmmanual.pdf
https://parnessbaga.files.wordpress.com/2015/07/honda-ca125-rebel-manual-pdf.pdf
https://www.partsfish.com/page/oem-parts-for-honda
Honda CA125 Rebel Owner Manual
Honda TWINSTAR 250 Service Repair Maintenance

Nov 11, 2017 | 1997 Honda CA 125 Rebel

1 Answer

I need to know the proper tuning of ucal mikuni carburetor with mixture adjusting screw on bottom of cabr (beneath float bowl), an idle adjust screw and pilot screw (hopefully pilot fuel screw since s


Why did you need to clean the carb? Routine servicing of the aircleaner would keep the carb clean for life. The pilot screw should be 1.5 turns out approx. with a small adjustment either way. Idle speed is set to a smooth low idle.If this doesn't fix it have you got something in the carb not replaced correctly? The float needle/float assy? How did you clean it? Have you introduced fluff/dirt into the carb and did you blow it clean with an airline?

Oct 09, 2014 | Motorcycles

1 Answer

Diagram of mikuni carbs


clockwise for leaner mixture( it's really and air/fuel mix)

Jul 07, 2014 | 1990 Yamaha XTZ 750 Super T?n?r?

1 Answer

1979 Honda CX 500 B air/fuel mixture adjustment


Hi, Dan it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
https://www.youtube.com/watch?v=wAXcksgvDkM
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
8. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
9. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Mixture adjustment
cx500 carb balancing part 1
Honda CX500 Shop Manual
https://www.partsfish.com/page/oem-parts-for-honda
Honda CX500 CUSTOM Owner Manual

Apr 04, 2012 | 1979 Honda CX 500 B

1 Answer

Suzuki GS 750 E factory settings Mikuni 37mm carbs


Hi, Bill if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://www.pnwriders.com/threads/mikuni-carbs-1979-suzuki-gs750l.173991
Carburator Theory and Tuning
http://www.vanluik.eu/Suzuki%20GS750%20Service%20Manual.pdf
OEM parts for Suzuki
http://mybikemanuals.com/suzuki/suzuki-gs-owners-manuals

Jan 21, 2012 | Suzuki GS 750 E Motorcycles

1 Answer

1979 Honda CBX carburetor tuning


Hi, Nielyerdon if you have changed your engine size, fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" you're not getting enough fuel.
1. Close to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. A wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
The International CBX Owners Association
HONDA CBX CBX1000 CARBURETOR PERFORMANCE TUNING JET KIT 24 MAIN JETS eBay
How to sync carbs on motorcycle
Carb Sync Tool eBay
Honda 1979 CBX Shop Manual
https://www.partsfish.com/page/oem-parts-for-honda
1979 Honda CBX Owner Manual

Jan 10, 2018 | 1979 Honda CBX

1 Answer

1980 1100, I need mixture screw settings, have set at 2 turns out but am at about 2000ft above sea level so maybe has to be altered slightly? In or out?


First - I do not know this bike specifically, but with 4-strokes the screw usually adjusts the fuel, not the air in the pilot circuit. Keep in mind this screw only adjusts the mixture from idle up to just under half throttle. It won't effect higher engine speed performance.

Basically, you can adjust them in 1/2 turn increments until you get the desired performance. Or, fire it up, and adjust the screws with it idling until you can get the highest, smooth idle - this is likely where it will be best.

Now - if the screws are 'behind' the carb slide (air filter side) they are an air screw. If they are on the engine side of the slide, they are fuel screws - the two work opposite of eachother. They're likely on the engine side of the slide, so screwing them in will lean out the pilot circuit (less fuel). So - if after you adjust the screws as described above, check to see how far out from seat they are. If you are not around 1.5-2.5 turns out, you might consider changing the pilot jets inside the carb.

Nov 12, 2009 | 1983 Suzuki GSX 1100 E

1 Answer

Cant find fuses to switch starter


Hi,
The fuse box is located behind the left side cover. Look for a black rectangular plastic box just under the flasher relay. That box opens up to reveal the fuses.
Hope this helps

Mar 16, 2009 | 1979 kawasaki KZ 1300 A1

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