Question about 1985 Yamaha XJ 700 X Maxim

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Its a 1985 Yamaha xj700 maxim that has a problem with the fuel and vacuum line, from the fuel tank to carburetors and drain line diagrams

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  • Yamaha Master
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Hi, Sevensons7 always check 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.
* If equipped or applicable.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Yamaha XJ 700 Fuel and vacuum line diagram Google Search
petcock fuel yamaha maxim xj700
Yamaha XJ700N Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

Posted on Jun 30, 2016

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Posted on Jan 02, 2017

rockitman187
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SOURCE: My bike has a rough idle and sometimes backfires.

Check the timing,If it is set right,your carb is running lean.


Please rate this a fixya.

Posted on Feb 14, 2009

SOURCE: 1985 Yamaha XJ700 Maxim won't work

All engines need the same three to four things to work correctly..
Compression, Fuel, Spark, (timing).... But, usually those bikes, have fuel issues. The fuel tank spigot has a vacuum controlled valve which when the engine is cranked, suction is applied and fuel then can flow. Second,, the needle and float in the carb tend to get gummed up along with the main and idle jet... You need to make sure the carb is maticulously clean, Using carb cleaner, and tag wire,, or a piece of fine wire ( be careful not to enlarge the tiny holes). Keep refering to the 3-4 list fuel, compression, Spark,,,timing.....
Good luck...!!
Rib

Posted on Mar 12, 2009

  • 1 Answer

SOURCE: Is there a wiring diagram for a 1985 Yamaha Maxim

I can't find an owners manual for my 85 XJ700 I just purchased. Anyone know where to go?

Posted on Jun 15, 2009

  • 8 Answers

SOURCE: 1985 Yamaha xj700 Maxim- Carb. fuel lines

yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Posted on Jul 04, 2009

SOURCE: 1985 Yamaha Maxim XJ700 not starting

It seems the float chamber of the carbs are not getting enough fuel (gas).
Try to check this first by opening the carburator float chamber drain screws....thn select the petcock to 'prime' positon and see if theres fuel running out of those drain screws freely.If not thn it time to clean the carbs.
Not bad too to remove the spark plugs and clean them and regap.
Hope this helps!

Posted on Jul 13, 2009

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Why am i getting no fuel 1985 yamaha maxim 700?


Hi, Anonymous always check 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.
* If equipped or applicable.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery, you need 12.5 volts or better and be able to pass a load test if necessary.
11. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2, TPS, ETP, IAC,or BAS).
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box if applicable.
17. Tilt sensor needs a reset.
18. Security system not disarming alarm needs a reset.
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Sep 04, 2013 | 1985 Yamaha XJ 700 X Maxim

1 Answer

Yamaha maxim xj700 i removed carbs to clean...are there 2 fuel lines going into the fuel block??


I'm guessing that the fuel block you refer to is the inner side of the petcock assembly. If this is so, the larger line is the fuel supply and connects to a swivel pipe in between two of the carburetors and feeds all four through internal piping. The second smaller hose is a vacuum line to operate the petcock and runs from one of the rubber carb mounts to the petcock. My 85' model also has four vent hoses running from the top front part of each carb back and down between each one. I hop this helps.

Oct 25, 2011 | 1985 Yamaha XJ 700 X Maxim

1 Answer

Why does my 1985 Yamaha Maxim XJ 700 stall / die in the rain. I can be riding along at 50mph in the wet rain / drizzel then it just dies


Hi, Achlubna and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
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9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
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12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. The gas cap is not venting properly or fuel tank venting system blocked.
15. A failed fuel pump, pressure regulator and or fuel injectors.
16. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
17. Needle and seat stuck closed in the float bowl.
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Actually, they're not Hitachi carbs. Since you have a 1985 "Maxim-X", the model number is actually XJ700XN. The XJ700 does indeed have Hitachi carbs but your bike, the XJ700XN Maxim-X has BS33 Mikuni carbs.

Careful with the model number, the XJ700 and the XJ700X are entirely different bikes.

By the way, if you want more answers about your Maxim-X, feel free to visit the "Maximum Maxim-X" web site at www.maxim-x.com and the lesser known FTP site for the Maximum Maxim-X web site at www.maxim-x.com/pix

HAP

Feb 13, 2010 | 1985 Yamaha XJ 700 X Maxim

1 Answer

1985 Yamaha xj700 Maxim- Carb. fuel lines


yes, the breather line hooks to the petcock on the line facing the back, the fuel line hooks to the larger one. the line from the breather is actually a vacume line that turns on the fuel, without it you will not get fuel out of the petcock unless it is in the prime position.

Jul 04, 2009 | 1985 Yamaha XJ 700 X Maxim

2 Answers

1985 Yamaha XJ700 Maxim won't work


All engines need the same three to four things to work correctly..
Compression, Fuel, Spark, (timing).... But, usually those bikes, have fuel issues. The fuel tank spigot has a vacuum controlled valve which when the engine is cranked, suction is applied and fuel then can flow. Second,, the needle and float in the carb tend to get gummed up along with the main and idle jet... You need to make sure the carb is maticulously clean, Using carb cleaner, and tag wire,, or a piece of fine wire ( be careful not to enlarge the tiny holes). Keep refering to the 3-4 list fuel, compression, Spark,,,timing.....
Good luck...!!
Rib

Feb 24, 2009 | 1985 Yamaha XJ 700 X Maxim

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