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Just bought a 1980 yamaha xs850 and it seems to be

Just bought a 1980 yamaha xs850 and it seems to be overheating after only a short amount of time. It then barely turns over and wont start again until the motor cools down. Everything seems normal, I am completely mystified. Any ideas?

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  • 219 Answers

Is the bike water or air cooled?
If air cooled then it is possibly either an oil or fuel issue. If water cooled your water pump or thermostat may not be working.

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

robotek
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SOURCE: My MT-03 engine shuts down while driving and won't start again.

Checking the colour of the plug may tell you what the general state of tune if like for the bike, but the sudden stops sure sounds like ignition system failing. Fuel delivery still there, although it may well be flooding/overfueling for some reason when the problem occurs.  I suppose you have checked the VIN (RM021000000000301 to RM021000000008715)  just to be sure that your bike if not one of those affected by the recall. I would be asking the Yamagents to check for the mods/recall to be sure that whatever the solution is has actually been done to yours. The reference to wet weather would be inclining me to follow that up to the max. Sounds too close to the problem to not be it. 

Posted on Jan 08, 2009

ginocussen
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SOURCE: Intermittent starting fault on 1994 Yamaha XV1100

Starter motor bearings or brushes are sticking. Strip and overhaul.

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SOURCE: can i use parts from a 1981 yamaha 650 on a 1980 yamaha xj650 maxim

there is not much difference between those 2 engines. they are the same cc and both are in-line 4 cylinders.

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my 2008 700 grizzly has check engine light on and the plug is lean. I changed the battery but it still doesnt chage itself

Posted on Jun 26, 2011

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Does anyone know a good way to remove a petcock filter that's stuck in a gas tank?


Hi, Eli an aggressive pair of needle nose pliers comes to mind 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.
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Hi..I just bought a 1978 yamaha xs750se..is the engine and transmission use the same oil? Thanks for help


xs750, xs850 service manual - Biobug.org

biobug.org/motorcycle/xs850/Yamaha-XS70-XS850-Service-Manual.pdf

its in this repair manual pdf
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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.
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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.
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1 Answer

1980 Yamaha XS850 won't start


Hi, Tpowless_97 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.
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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My XS850, though getting spark, wont fire. It keeps flooding out after several attemots to start it. Is there a way to check the timing on this bike ? Any suggestions truly appreciated. Thbks


Remove carbs and make sure all of the fuel inlets are seating properly. you should probably clean them good and set all the floats while you have them off.

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