Question about 1981 Yamaha XJ 650

1 Answer

Gas/oil mixture gushing out of airbox when throttle is opened

Just took the carbs apart, cleaned them out with carb cleaner. one floater is a little sticky, other than that, no problems. reassembled, started the bike up. idles with choke fully open, when the throttle is opened up, after a few seconds the airbox starts gushing out a gas/oil mix. Bike is actually an XJ 550 model.

Posted by on

  • Anonymous Mar 20, 2014

    I'm gettin gas in my oil after I get done ridding an shut my bike off then when I go back to start it an check my oil I notice gas n the oil, so what's the problem an how do I fix it?

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Yamaha Master
  • 767 Answers

Please visit this site there's a lot of information on all XJs
www.xjbikes.com

Posted on May 19, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have a psa 225 echo weed eater. The engine readily starts but will only rev up using the choke lever back and forth. No power. What's my problem?


Carb or filter
. replace fuel filter in tank while checking both pickup and return fuel lines.
remove carb and disassemble cleaning all parts with carb cleaner and some soft air blow . look for small screen its round and about 1/4 round in carb these are so small that the gas that's available gells and plugs the openings . try to use non-ethonal high octane gas and use echo 2cycle oil .

Jan 26, 2017 | Echo Garden

1 Answer

Why does my craftsman 2-cycle model 316.791860. Gas trimmer die?


Those little carbs clog very easily and what you experience is a common symptom. Go to any bog box home store and in the mower area pick up a can of small engine carb cleaner.
Remove the carb, take it apart as far as you comfortably can and soak all pieces in a can/jar of CLEAN gasoline for 10 -15 mins. Agitate to get the gas moving.
Remove the carb, and drip clean then use the carb cleaner to blow out every port you can see. reassemble and install the carb, it should work fine.
Before storing for the winter drain all gas from the tank and start it allowing the machine to run till it stalls out due to no gas. You should be fine for next season that way.

Apr 27, 2014 | Craftsman Convertible 25cc. Gas Line...

1 Answer

86 honda shadow VT500C flat spot in throttle about 1/4 throttle


The carbs are most likely clean, especially if they were soaked in real alkaline carb cleaner. Honda Shadows are very fussy about incoming air. If the air cleaner intake box is not fastened securely to the carburetor intakes the engine will run lean. The reason for the lean mixture is there is not enough negative pressure with the airbox disconnected and the carbs get too much air and not enough fuel.

Dec 02, 2012 | 2004 Honda CRF 250 X

1 Answer

My hedge trimmer will not start... Put in new gas


It's not getting gas, due to being gummed up with old gas. Remove all of the old gas and mix up a batch of fresh gas&oil. Also get some carb cleaner. Put just a little of the gas&oil mix plus an equal part carb cleaner. Try to start it just to work the new mixture through the carb. You might use the spray start to help pull the new gas through. If it fires up on the new gas&oil&carbcleaner mix, shut it off and let it sit for an hour or two. Drain it out and try just a little gas&oiil without the carb cleaner. If all is well fill the tank. If not, repeat the whole process. If you can't clear the gum this way you may have to remove the carb to clean it. Good luck.

Oct 22, 2010 | Craftsman 22" Gas Hedge Trimmer

1 Answer

Carb is not letting gas in?? and what kind of gear oil/motor oil does it take?


Take the Carbeurator apart as much as possible. After that spray carb. cleaner in all the little holes that carries gas. I did it on my yz-125 and found a grass-hopper leg that kept over flowing the carb. Also make sure your throttle cable is good

Nov 15, 2009 | 2003 Suzuki DR-Z 125 L

1 Answer

87 325 runs good when


It's the automatic choke!

The choke is "closed" or barely open... When cold, the engine needs a RICH mixture (more gasoline, less air). When the engine warms up, it requires a LEAN mixture (less gas, more air).

It is probably creating BLACK tailpipe smoke ... that means unburnt gasoline. (Blue smoke is OIL, white smoke is WATER).

Put the parking / emergency brake ON.
1. Remove air cleaner assembly from intake, use a carb cleaner spray or throttle body spray cleaner and spray just a little. (AutoZone $5)
2. Find the accelerator2.gif arm under the hood.
3. start car, rev the engine to make sure how to operate the accelerator from under the hood.
4. Carefully spray into carb / throttle body and work the accelerator ... don't let the engine die...
5. Watch out for "backfire"... it may create a small flame out of the carb. It will extinguish itself in one second.

6. You may need to do this two, three times.
7. Add a "complete fuel system2.gif cleaner" to your next tank of gas ($8).

That's it! ... pretty cheap, too.

Hope this helps!

Sep 04, 2009 | 1987 BMW 3 Series

1 Answer

2003 V Star 650. Had fule pumping out of air cleaner box


you shouldnt have to resync the carbs as long as you dont touch the mixture screws or the screws for the throttle blades. you wont have to pull the jets completly out to clean them just spray the heck out of all the orifaces with carb cleaner once you have them pulled apart. Also whe you put it back together make shure the carb seal to the engine and airbox are tight with no leaks, this will make it run bad also

Jun 20, 2009 | 2006 Yamaha V Star Custom

2 Answers

1986 honda shadow vt500c throttle hesitation.


If your bike has carbs and not fuel injection, ( difficult to remember back 23 years ago ), then remove the carb slides and move the clip on the jet needle down one notch. This will richen the low end mix and provide it sooner. You may need to go two notches but start with one notch. Also, sync the carbs such that the slides on both carbs move at the same exact instant when the throttle is slowly turned from idle speed < engine off. Clean the carbs when you get a chance.

Please rate this solution. Thanks Cindi!

Apr 29, 2009 | 1985 Honda VT 500 C Shadow

1 Answer

Fuel gushing


I'm gonna go with theory #2 sort of. My guess is that one or more of the float valves is leaking causing the gas to overflow into the crankcase. This happens often with bikes that are allowed to sit for long periods with gas in the carbs and tank. A thorough fuel system cleaning is what it needs. I'd say go ahead and buy four carb rebuild kits for it - may as well since you'll have to disassemble the carbs to clean the gum and varnish out, which is really the best thing for it at this point. I wouldn't try to run it again 'til you get the carbs to quit leaking, the fuel drained out of the crankcase and put fresh oil in. ,,,

Nov 10, 2008 | 2005 Beta RR 450

Not finding what you are looking for?
1981 Yamaha XJ 650 Logo

Related Topics:

361 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

dhnguyen

Level 2 Expert

281 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1144 Answers

Tony

Level 3 Expert

2600 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...