Question about 1982 Yamaha XJ 650

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My yamaha xj650 misses on acceleration and smells like it is flooding. I'M going to have the carbs tuned, (there are 4 of them) Could this be a syncronization thing?

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Well it could be-but more likely a needle & seat issue. Carby sinc is an important adjustment & nearly allways makes the bike run better but it can be affected by other problems such as faulty plug caps or coils which is common on xj650s.Also if yours is equiped with YEIS(yamaha energy induction) there is a special tool required to be inserted before adjusting the carby balance.

I'd check the coils/caps first.I'm going to do a tip on testing motorcycle twin coils so check it out Then check the carbs next.
Hope this helps
regards Andy

Posted on Jul 15, 2010

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1 Answer

1981 Yamaha XJ 650 not getting gas to engine


Hi, Terry I would do a compression check first and always check the fuel flow second 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.
* If equipped or applicable.
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.
Total Motorcycle Forums
Carburetor Issues on my 1982 xj650
Yamaha XJ650 1980 1984 Manuals service manual not owners
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

Oct 03, 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.
XJ650 carb tuning with the dreaded pods
Carburetor Sync Yamaha 650 Maxim 1981
Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

Jun 29, 2014 | 1982 Yamaha XJ 650

1 Answer

I have bought a 1981 Yamaha XJ550H Maxim The Idle was 4000Rpms, Since, I have replaced the Intakes, and Have rebuilt the carbs with new slide diaphragms and put new carb kits in the carbs, I have bought a...


Hi, Anonymous start with 1 1/2 turns out then you will need a vacuum board or 4 vacuum gauges to sync all four.
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 $10 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.
81 Maxim xj650 Carb Sync Running like Cap
Carburetor Sync Yamaha 650 Maxim 1981
DOWNLOAD YAMAHA XJ550 Maxim Seca REPAIR SERVICE MANUAL Download Manuals... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

May 13, 2017 | Yamaha Motorcycles

1 Answer

1982 maxim 650 idles rough


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
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.
Yamaha XJ650 Idle Problem
1994 xj600 seca 2 rough idle
Yamaha XJ750 Owners Workshop Manual
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Aug 27, 2012 | 1982 Yamaha XJ 650

1 Answer

Carbs flooding yamaha xjr 1200


Hi, Anonymous and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat is worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
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.
http://www.yamahaxjrownersclub.com/phpBB3/viewtopic.php?t=44122
Flooding carb
YAMAHA XJR1200 FACTORY OWNERS REPAIR MANUAL 1995 2006 Download Manuals... $24
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

Apr 14, 2012 | Yamaha XJR 1200 Motorcycles

1 Answer

1982 Yamaha 650 maxim carburetor problems


Hi, Anonymous 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.
Carburetor Sync Yamaha 650 Maxim 1981
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Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf


Mar 16, 2012 | Yamaha XJ 650 Motorcycles

1 Answer

I have a 1980 xj650, rode home after buying. It ran out of fuel, now i can not get it started. I've check plugs, spark, fuel flow to carbs, even changed the oil. The cylinders smell of gas and the plugs...


It may be possible that when it ran out of fuel that it grabbed any **** that was in the bottom of the tank and put it into the carbs, which may have gunked them up and they might need to be cleaned.

To verify that it IS or is NOT fuel or Carb related, get some starting fluid and shoot it into the air filter box ( or along the pod filters if the original box has been removed) to see if it starts. If it DOES start, you have a fuel issue either with the carbs being gunked up (idle jet or main jets), or the floats could be stuck open (again with gunk from the bottom of the tank) and thus flooding out your motor (you said it smells like gas). Usually if it smells like gas and the plugs are wet, something is wrong with the ignition since its not burning it. So if all of the above is OK, check the timing under the points cover, you may have to set the gap (on most older bikes its around .30-.40mm) But since you rode it home I doubt thats it.

Nov 08, 2010 | 1980 Yamaha XJ 650

1 Answer

03 vstar 1100 idles good runs bad under throttle. Changed plugs,cleaned carbs on bike.Pulled rubber diaphragm's cleaned with carb cleaner.Bike will turn over but will not fire off.New plugs fouled.Good...


Hi, Cgallops108 and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
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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http://www.sloneservices.com/SilverBack/Other-Stuff/V-StarShopManual99-07.pdf
OEM parts for Yamaha
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Mar 21, 2010 | 2001 Yamaha V Star 1100 Classic

2 Answers

Car cuts out on acceleration


it sounds like the points are not opening enough. or to much timing. thats to far advanced timing. but points most likely good luck.

Nov 23, 2008 | 1966 Ford Mustang

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