Question about 1981 Yamaha XJ 650

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My 1981 yamaha 650 special has a problem with the carburetor leaking fuel into the air cleaner. any ideas

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You hve to clean the carburator and adjust the float ..plz go to this site you will find a lot of usual information to it www.xjbikes.com

Knight. (yamaha seca XJ750A 1981)

Posted on Apr 21, 2009

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1981 Yamaha XJ 650 carburetor fuel line location


Hi, Terry for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing and printing please click on the blue links below. Good luck and have a wonderful day.
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Jul 24, 2017 | 1981 Yamaha XJ 650

1 Answer

1981 Yamaha XJ650 engine not getting fuel


Hi, Terry always check the fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Jul 24, 2017 | 1981 Yamaha XJ 650

1 Answer

Yamaha carb settings


Hi, Anonymous 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. Here is how and where you compensate trouble:
1. Closed 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, 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 please click on the websites below. Good luck and have nice a day.
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Jun 29, 2014 | 1982 Yamaha XJ 650

1 Answer

I have a 1981 Yamaha Seca 650 the floats have stuck


Hi, Shanna your fuel system is probably contaminated for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Aug 23, 2013 | Yamaha XJ 650 Motorcycles

1 Answer

1981 maxim carb air/fuel screw


Hi, Hartlou for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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May 02, 2012 | 1981 Yamaha XJ 650

1 Answer

650 yamaha vstar 2006 stalls out when giving it gas


Hi, Donjkiii and the usual suspects are:
1. Idle port, transfer ports, slow air jet clogged.
2. Idle adjusting screw set too low.
3. Air fuel mixture adjustment too lean.
4. Pilot/slow fuel jet clogged.
5. Faulty accelerator pump.
6. Float level too low.
7. Float bowl contaminated old fuel, water, dirt, rust, etc.
8. Carburetor bowl vent line clogged/blocked/pinched.
9. Fuel line to carburetor kinked or pinched.
10. Fuel filter clogged.
11. Intake manifold leak.
12. The gas cap is not venting properly or fuel tank venting system blocked.
13. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
14. Needle and seat stuck closed in the float bowl.
15. Multi carburetors not in sync.
16. Faulty fuel pump.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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1 Answer

My 1981 yamaha 400 special will start, (sometimes) but will not stay running for more than a minute or so, any ideas?


Is there gas coming from the gas line? Its sounds like you need a new spark plug maybe even a carburetor cleaning. Thats my guess.

Jul 29, 2010 | 1981 Yamaha XS 400 Special

1 Answer

When I start my 1981 Yamaha 650, it seems to run fine but gas is streaming out a small tube under the carburetor. What is the problem? How do I fix it?


That is the overflow tube indicating you have a float or needle and seat problem.The needle seat and float control the fuel level in the carbs if the needle is worn it will over flow.If you have a bad float you will have a
over flow
If the carbs are dirty or gummed up and not alowing the parts to move is another reason it will leak.
In any case best to clean and rebuild the carbs.
clean and replace worn parts as needed.

May 24, 2010 | 1981 Yamaha XS 650 H

1 Answer

Got spark but wont go what do i do


Has it been sitting for a while? If so, remove the bowls of the carburetors, and clean out the jets using carburetor cleaner and a set welding tip cleaners (welding tip set available at hardware stores). Also, add Berryman's B-12 to the tank to help dissolve any varnish build-up.

Aug 18, 2009 | 1981 Yamaha XJ 650

1 Answer

When warm will not stay running+leaks oil to the air cleaner


This is an XS 650, no? Sounds like you might have some piston ring blow-by (especially if its burning some oil), or possibly bad valve seal's'. The valves could be tight, so make sure the valve clearance is correct first, then compression test, and finally a 'leak-down' test.

If it is blowing by, it probably is fouling plugs and you will need more energy in the spark to fire, but this is a secondary issue, which will be eliminated with the fixing of the other issues. Good luck!

Jun 25, 2009 | 1981 Yamaha XJ 650

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