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Alicia DesRosier Posted on May 15, 2019
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Trying to find the engine number on my 1979 Yamaha 1100 XS special

1 Answer

Akbar Mughal

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  • Master 540 Answers
  • Posted on May 16, 2019
Akbar Mughal
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C it at bottom side...

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5 Related Answers

tombones

  • 3567 Answers
  • Posted on Apr 01, 2009

SOURCE: looking for a manual for a 1979 Yamaha XS 1100.

Get on the web and Google " motorcycle service manual yamaha "
Also try your local library. Often manuals are donated.

Please rate this solution. Thanks!

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Anonymous

  • 132 Answers
  • Posted on Jun 15, 2009

SOURCE: Air and Oil filter change on a 1979 Yamaha XS 400.

air filter is behind 1 of the side panels, oil filter is in the sump depending on which motor it is it may be a mesh type near the oil pump.

Anonymous

  • 1 Answer
  • Posted on Aug 29, 2009

SOURCE: Can't find Model number.

I checked with a local Yamaha Dealership. They found it.

It's a SF model.

Bob G

  • 104 Answers
  • Posted on Oct 05, 2009

SOURCE: 1980 Yamaha XS 1100 Carduretor diagram

It is part of a detent mechanism for the choke. No, all 4 carbs do not have them, only 1.
Here is a link to Yamaha's website, where you can pull up a diagram of your bike's carbs. The ball is #10 and there is also a spring with it.
http://www.yamaha-motor.com/sport/parts/home.aspx
They are saying there are 2 balls and 2 springs, but I do not remember them having 2. I also don't see another #10 or #11 on the picture anywhere. You should be able to look at the rod that connects all the chokes together and see if there are 2 sets of dimples for the balls. Obviously there will be one set in carb #1, if you find another set of dimples for a detent ball, then there indeed would be 2. Also, the carb body would be drilled for the spring and ball like the #1 carb is.
Thanks
RSRBOB

Anonymous

  • 267 Answers
  • Posted on Jun 14, 2010

SOURCE: I'd like to download the Owners manual for this

http://www.yamahaownershandbook.com.au/?r=0

Try this link from the Yammy Owner's Club, members have downloaded a whole pile of manuals for free download, just enter your bike model.
Cheers.

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1answer

WHY would I have oil in where my flywheel and coil

There's a seal where the crankshaft comes through the block most likely defective. Because the crank rotates through it, failure is more likely.
Sep 27, 2014 • Motorcycles
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WHY would I have oil in where my flywheel and coil

I haven't looked at a XS 1100 for many years, but my first guess is a leaking crankshaft oil seal. 1979 is a long time ago, 35 years to be exact, and if your bike is still running well, it deserves to have a leak here and there.
If the oil leak is not too much, keep an eye on the oil level in the engine and enjoy the ride, else you have to pull off the coil packs and flywheel (probably dry clutch assembly) to get to the oil seal. The best would be to have a bike shop look at it if it really bothers you.
Keep the air in your hair, your feet on the grass and the bears off your rear (view mirror). Oh yes, put a piece of rag on the floor under the engine when you park it!
Sep 27, 2014 • Motorcycles
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I have a 1980 yamaha xs 1100 special, it sat in a garage for 3 years, i replaced the fuel lines, cleaned the tank, and replaced the plugs, how come it only idles when the choke is on and it sounds like a...

You probably have varnish build up in the carburetors, causing restricted air flow, and therefore the engine is running too lean, especially on the right side, and a lean running engine will run hot at the exhaust. It only idles when the choke is on because the choke creates a richer fuel supply. A can or two of commercial fuel cleaner through the fuel supply may get the engine's jet's orifices cleaned out. Otherwise, overhaul the carbs.
Hey, nice old bike, though. Good luck
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Can't find Model number.

I checked with a local Yamaha Dealership. They found it.

It's a SF model.
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What is the best kind or type of oil to use when changing for regular maintainance of 1981 yamaha xs 1100?

Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell.

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