Question about 1981 Yamaha XS 400

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I have a 1981 xs400 and the wiring harness got burnt up be the previous owner. is there any other years that will match up with this bike?

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The XS400 H (Special 2), SH & SJ (Heritage) US models share the same harness
Ride safe
Bike-Doc
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Posted on Apr 28, 2010

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Missing ignition start switch for 1981 yamaha xj650 maxim, what's the amp required to start it? Having trouble finding the right momentary switch to install


Starting doesn't go through the ignition switch it goes through the starter solenoid and the ignition switch controls that solenoid only about 5 amps.

Apr 04, 2017 | 1981 Yamaha XJ 650

1 Answer

Won't start just backfires


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 CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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.
https://yamahaclub.com/forums/topic/23165-custom-1981-xs400-special-wont-start
Won start backfires
Yamaha XS 400 SH Service Manual ENG XS360 2D XS400 2E 2F SG Supplement ENG...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 13, 2014 | 1984 Yamaha XS 400 L Maxim

1 Answer

Chain leaks oil


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 $10 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.
Oil leak from Clutch rod seal
https://yamahaclub.com/forums/topic/22486-1980-xs400-leaking-oil-pictures-how-screwed-am-i-lol
Yamaha XS400 1977 1982 Workshop Service Repair Manual Download Manuals...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 09, 2014 | 1981 Yamaha XS 400 Special

1 Answer

Can't find a workshop manual for Yamaha xs400 dohc(seca/maxim??) ANYWHERE!!!!...I have the motor for a bobber project and need the workshop manual for a bit of guidance....any help much appreciate


Hi, Roger the vast majority of service, parts, and owners manuals on the internet are "FREE" to download and all service manuals contain wiring diagrams in the back pages. The rest usually charge a modest fee around $10 sometimes more and there is a handful of obscure, rare, obsolete, and very old models that are no longer or never were available, then there is eBay where you may be able to find what you need at a very high price because of its age and rarity. Most of the "FREE" manuals will cover your exact make, model, and year otherwise one will be provided that comes as close as possible to your bike and will have most of the same info that an exact manual would have. To download your manual please click on the links below. Good luck and have a nice day.
Yamaha XS 400 SH Service Manual ENG XS360 2D XS400 2E 2F SG Supplement ENG...
Yamaha XS400 1977 1982 Workshop Repair Service Manual PDF Download Manuals...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 01, 2012 | Yamaha XS 400 DOHC Motorcycles

1 Answer

1981 Yamaha xs400 timing specs


Hi, Kbrushett 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.
Ignition timing on 1981 special
How to set the timing on Yamaha XS400 motorcycle
Yamaha XS360 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 16, 2011 | 1981 Yamaha XS 400

1 Answer

What kind of oil to use in a 1981 yamaha xs400


its best to use a good oil especially on older bikes i use amsoil 20/50 it cost more but is best

Jul 09, 2011 | Yamaha XS 400 Motorcycles

1 Answer

HOW TO REMOVE STARTER MOTOR FROM 1982 XS400 YAMAHA STREET BIKE


Hi, Ljonesy440 for this scenario you will need your service/owners manual if you can't find the 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 XS400 How to Remove Starter
HOW TO REMOVE STARTER MOTOR FROM 1982 XS400 Google Search
Yamaha XS400 1977 1982 Factory Service Repair Manual PDF Download Manuals... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Jul 13, 2010 | 1982 Yamaha XS 400 SE

1 Answer

1980 xs400 se will not get spark some wires burnt


possible the cdi unit went the journeyat the same time, only way to tell is to try another cdi. best of luck.

Nov 10, 2009 | 1980 Yamaha XS 400 SE

1 Answer

Speedometer goes very slow both up and down again on a 1981 yamaha xs 400 special. how do i solve this? is there a heater in the speedometer and is it replaceable. there is a bulb and something that look...


there is no heater. remove the cable from front wheel to speedo, lube it with 3 in 1 oil (or any other thin oil), remove speedometer and put a few drops of oil where the the cable goes into it. my first bike was a brand new 1982 xs400 when i was 17, ah the memories

Aug 28, 2009 | 1981 Yamaha XS 400 Special

1 Answer

1981 Yamaha XS 400 wiring diagram


Hi, Mr_iceman_de for this scenario you will need your service/owners manual if you can't find the 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.
1981 Yamaha XS400 wiring diagram Google Search
Yamaha Motorcycle Wiring Diagrams
Yamaha XS400 1977 1982 Factory Service Repair Manual PDF Download Manuals... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xs-owners-manuals

Apr 02, 2009 | 1981 Yamaha XS 400 Special

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