Question about Yamaha XS 400 Special Motorcycles

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1100 midnight special carb and gearbox settings Carbs flood and heavy on fuel When pulling away the gears slip between 1 st and second if the power is opened up, slowly pulling away under 2500 rpm seems normal

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Do you have belt drive or chain? if you have chain and isnt adjusted and could be adjusted a little bit tighter you might see some improvement....oh and don't be wearing tennis shoes when you shift....wear boots....i"ll tend to give a more positive up-shift into second gear!
As far as carbs you turn your fuel to the off position and check the fuel cap vent system....too much pressure in a full tank and an open petcock my cause those bowls to over-flow. drizziling fuel into the carbs. Wet plugs in the morning.....hit the kill switch and crank for 5 sec.with throttle wide open, then wait 10 sec put kill switch back to start and try might also have the wrong fuel pump installed!

Posted on Sep 13, 2009


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Why FZR600 seems to lose two cylinders while driving, carb or spark problem?

if carbs are clean and not flooding etc then try finding out which cyls are off then swop plug caps over from good cyls and see if problem moves , if yes then fit a set of 4 new plug caps ! if no then do carbs again !!

May 20, 2014 | Yamaha FZR 600 Motorcycles

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I have a ccm 644,ever since I bought it,its leaked fuel from carbs,ive had carbs off 2 or 3 times,cleaned them,but every time I get it stop leaking and I put the bike away for a couple of weeks,next time I...

Flooding carbs often means that the needle valve that the float is supposed to close is leaking, causing the float chamber to overflow. replace needle valves.

May 06, 2014 | CCM Motorcycles

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Front cylinder not firing on my 2000 yamaha v star classic 1100

Sounds like its the float in the front carb is sticking,causing it to flood the front cylinder with too much fuel. Need to clean carbs,reset float levels,and synch them. Running it like this will wash the oil out of the cylinder,causing it to lose compression.

Sep 24, 2012 | 2000 Yamaha V Star 1100 Classic

1 Answer

I have a 86 honda shadow vt 1100 has spark wont start

the Bike need three things to run Spark ait and fuel. if your sure you have spark then move to fuel, check if fuel is getting to carbs. if not turn on petcock if pet **** is on and still no fuel may need to add fuel or check and see if petcock is clogged. if petcock is clogged then remove gas tank and clear out any and all debres.

If you are getting fuel to carbs and bike still does not run, check air box to see that it hasent become a new home for mice. if bike has been sitting for a while 60 days or more (ethinol in gas REALLY cloges up your carbs) you will want to pull carbs and clean flote bowls and all air ana fule passages, main jet and emultion tube slow jet and emultion tube check and clean venturi slide and check slide diaphram for holes. Check all seals and floats (Floats: if the floats have any kind of a hole in them they will fill up with fuel and flood the float bowls) check float bowl pins ( some times they get stuck closed not allowing float bowls to fill with fuel.

If you are not sure you can do this that find a local motorcycle mechanic who can help you. to keep repair costs down you may want to bring them the set of carbs removed from your bike (if you are able to)

Sep 12, 2012 | 1986 Honda VT 1100 C

1 Answer

I have a 2000 V-star 1100 and I know it probably need to be re-jetted but this morning while on the freeway it started stalling out in 1st gear and "backfiring" more tha usual.

There are a lot of possibilities on this problem but if this was my bike I would start by draining the fuel tank, pulling the petc0ck and cleaning it, changing the fuel filter and draining the carbs. Then fill with fresh fuel with maybe 1/2 a bottle of a fuel system cleaner/water remover and then giving it another shot - run it for a tank or two with the water remover/cleaner. If that doesn't do the trick (I bet it will) then maybe throw in a fresh set of plugs and a clean air filter. If that doesn't do it, you might have to pull the carbs down for a manual cleaning - there might be something in one of your pilot jets. If it is only the idle then you might want to try adjusting the air mixture screws on the carbs but thats a tad tricky because of the twin carb set-up. That would take a few paragraphs and a lot of patience to describe in text. Not to mention - I usually don't recommend making adjustments like that unless there is a damned good reason to do so - the adjustments don't change by themselves so if they need changed then something changed. Find what changed first. Try the fresh fuel first - I bet it makes a big difference. Run at least mid grade fuel, too.

Oct 17, 2011 | 2003 Yamaha V Star 1100 Classic

1 Answer

Hi,my zephyr 1100 keeps flooding back on carbs,fitted pilot jet kit and set floats,all started with not running bike enough,its a 1993 with only 6,800 miles,help.

onee of you carbs needle and seat is not closing all the way if you leave the gas on and remove the overflow tubes from each carb yuo should see this one leaking make sure bike is sitting up right so fuel isnt just running to one side

Feb 14, 2011 | 1993 kawasaki Zephyr 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...

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

Fuel in oil

Hi and welcome to FixYa,

While it is possible for the rings to be worn considering the age, only a compression test could confirm this.

Alternately, the possibility is that the carbs flooded and overflowed into the engine through the intake manifold at one time inknown to you.  Draining the contaminated oil from the engine and replacing the oil in most cases should address the issue.

Of course if flooding still occurs, it may be necessary likewise to pull out the carbs for a cleanup with particular attention to the valves coupled to the floats.

Good luck and thank you for asking FixYa.

Jun 27, 2009 | 1985 Yamaha FJ 1100

1 Answer

82 aspencade gl 1100 carbs keep flooding? i put them on buddys bike and they run great. so i changed fuel pumps, still flooding? whats left ?

It sounds to me you may have a vacum issue with your tank that is causing to much fuel to get deliverd to the carbs, try checking all the hoses on the tank to me sure they are in the correct place.If so then check the patcock to be sure that it is not allowing to much fuel through.

Mar 10, 2009 | 1982 Honda GL 1100 Aspencade Gold Wing

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