Question about Yamaha XS 650 SE Motorcycles

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My yamahai xs 100 engine has developed a serious

My yamahai xs 1100 engine has developed a serious misfire.when the carbs rubber balance pipe between 2 and 3 is disconnected,the engine picks up on the 4 cylinders but as soon as the pipe is re-connected the engine starts to pop pop through the exhaust really bad.I,ve tried everything from changing the carbs twice to fitting new rectifier etc.Also,since this problem has developed the 2 outside exhaust pipes have gone deep blue and purple.(just like we don,t want!!) etc.I,m at my wits end now and no-one seems to have any answers to this problem.--ps--its a 100 yamaha xs and not what i had to list as this engine was,nt listed.remember its an 1100 xs

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Does it run and ride fine with the balance pipe disconnected?
Have you checked your ignition coils. If you have a manual, check which coils fire which cylinders. Does this tie up with the two cylinders that are getting hotter, (are the other to staying cool/cold?) each coil provides the spark for two cylinders. You can swap the coils and see if the other two pipes go blue, that way you know a set of coils is bad. It sound like you have done everything on the fuel side, which leaves mechanical or electrical. Dont forget to check/clean/change the simple things such as the spark plugs and caps.

Posted on Aug 02, 2010


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1 Answer


Balance your carbs. Check your timing.

Dec 24, 2013 | 1990 BMW K 100

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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

May 20, 2011 | 1979 Yamaha XS 650 F

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Synchronizing the carburettors

They will be just on the intake engine side of the carbs.
I think the Kwaka still had rubber push on caps, some bikes have screw or allen bolts with a 5mm thread that you screw some adapter tubes into(these often come with the vac gauges)

Jul 24, 2010 | 1995 kawasaki GPZ 1100

1 Answer

Bike been stood for a while, starts no problem but fuel comes out of the rubber pipes at the top of the carbs were the diaphram is

it may just be sticky flotes or you may need to change the fule pipes as they could have rotted away
turn on the fule and try tapping the carbs to see if it stops leeking fule out the carbs but dont hit the carbs very hard just tap them! if it stops the fule leek strip carbs and clean the flote needels so they can move freely

Jun 08, 2010 | 1992 Honda ST 1100 Pan European (cbs-abs...

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Hi my gpz1100 has had 2 carb cleans now wihin 2

have the carbs been Balanced?,check for any air leaks around carb - engine rubbers - airbox rubbers for cracks

Oct 28, 2009 | 1995 kawasaki GPZ 1100

1 Answer

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.
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.

Oct 02, 2009 | 1980 Yamaha XS 650 G

1 Answer

Clean carby's

Not an easy job! I have the same bike...

- Remove the seats, the lower and both side fairing middel sections
- rRemove the fuel tank ( don't forget to close the fuel **** first ) and take care of the fuel level sensor lead
- Remove the battery leads
- Remove the 4 air filter casing bolts
- Remove the crankcase breater hose between air filter case and cylinder head cover
- Loosen the clamping bands on each end of the 4 carbs ( thus 8 bands )
- Pull the airbox to the rear and disengage the rubber joints from the 4 carbs
- Pull the carbs to the rear to disengage them from the rubber inlet-pipes.
- Move the carns to the right to have acces to loosen and disconnect the throttle cables.
- If there is an evaporative emission tube, disconnect it from the carbs, AFTER marking their place!
- Remove the carbs to the right side. That's quite difficult, there is not much place, be carefull.

to replace, just invert this way of work.
When engaging the carbs in the inlet-pipes, you have to feel them knok down at the end of the pipe fitting.
Be sure to tight the clamps correctly to avoid at 100% air leaks.
An air leak between carbs and engine will lean your mixture and will cause serious engine damage!

Mar 07, 2009 | 1986 Suzuki GSX-R 750 G

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