Question about 1977 kawasaki Z 650

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Carbs problem hi i own a z650 b1 and no fuel is getting to the second carb. i removed the float bowl and its bone dry yet the float seems to be ok. also fuel came out of the breather pipe , i presume fuel would only leak out of there if the float bowl was full, any ideas please, Ken Vickers

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Remove the fuel line from the carb. Turn the gas on > got flow? If not then clean the fuel line and petcock filter if it has one. Install an in-line fuel filter or replace the present one. Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Use compressed air to assist in cleaning. Is the float needle stuck closed? Be certain the vent tube and vent port are clear.

Please rate this solution. Thanks d_vickers2!

Posted on Apr 20, 2009

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Hi, Anonymous and the usual suspects are:
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There are 2 different enigines on these depending upong your actual unit model number.
One had a Subaru 175 cc engine and the other was a Honda engine. For carb specifics I need the ENGINE model number. Either way... here is what you need to do:
1. Fuel selector off.
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3. Use a spray can lid and check FLOW. It should fill the lid in under 8 seconds. (Feul selector OFF now) If you do not have good fuel flow here you need to inspect the tank exit port, in line fuel filter if used and the sediment bulb under the fuel selector for debris
(GOOD FUEL FLOW NOW)
4. Remove the float bowl by unscrewing the bowl nut from the bottom of the carb. NOTE positon of gaskets as you remove float bowl. Use carb cleaner and direct a spray hopefully with mini extension tube of the carb nozzle into the center of the threaded area of the bowl nut. (This cleans main fuel jet orifice / pin hole) Then spray carb cleaner using mini nozzle extension up the flat side of the float needle until carb cleaner exits the main fuel line connection. Last spray from the main fuel line connection to the float needle (reversed spray)

This usually removes any debris from the float bowl. main fuel jet and main fuel manifold Reinstall the main fuel line.
- Turn on the fuel selector and use the spray paint can lid under the float to catch fuel. It should fill in 8 to 10 seconds to the point your worried about over-flow.
- GENTLY lift the float needle to the level position. FUEL MUST STOP.
- Lower Float to resting position. FUEL MUST FLOW so that it would fill the spray paint can lid in 8 to 10 seconds. (FUEL SLECTOR OFF)

Clean the bowl nut and reinstall the float bowl. Turn on the fuel.. wait 30 seconds for the float bowl to fill completely and start unit. If it runs GREAT... If it only runs with the choke on you still have a fuel supply problem...i.e most likely the main fuel just in the threaded area of the bowl nut is still clogged. .

This should get you going. Thanks for choosing FixYa,
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Sep 01, 2011 | Garden

1 Answer

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Hi and welcome to FixYa, I am Kelly

If the generator has sat for some time the fuel in the float bowl will turn into a varnish like substance (shellac). The residual fuel in the carb will have to be removed. You do this by removing the fuel solenoid (or bowl nut) which ever one youhave that secures the float bowl to the carb. Then take a screw driver and remove the main fuel orifice and remove the debris from the main fuel orifice. Clean the orifice with carb cleaner. DO NOT push anything into the hole! Also spray the brass tube that the main fuel jet screws into with carb cleaner. You should see carb cleaner being sprayed into the throat of the carb.

While the fuel float bowl is removed get a spray can lid and hold it under the carb float. Turn on the fuel selector and the fuel should completely fill the spray can lid in 8 - 10 seconds. If you do not have this amount of fuel flow you need to remove the main fuel line from the carb and re-check fuel flow. If the flow is good here then use carb cleaner in the float needle area to force any debris back out the fuel manufold connection that is now open because you removed the fuel line. If you still do not have fuel flow then check for debris in the fuel tank exit port, the fuel filter, the sediment bowl under the fuel shut off assembly.
Once again with the spray can lid under the float you should have fuel flow anytime the fuel selector is on and the float level is down. It should shut off fuel just as it reaches level. Any other result and the float and float needle will have to be removed, cleaned and inspected for debris.

Make sure to re-install the main fuel orifice in the treaded area that secures the float bowl in place and.re-connect the main fuel line to the fuel manifold / carb fuel inlet connection

If the engine has a fuel solenoid hook it up and and see of it is working as you turn the key / engine switch on and off before you reinstall the float bowl. You make have to hold the case of the solenoid against the engine to make a ground AWAY from any residual fuel for testing. I.e. don't burn up your generator.
Re-install the fuel float bowl and test the engine. It should now work just fine.
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Thanks for choosing FixYa,
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Hi and welcome to FixYa. I am Kelly

Just by searching I think this is your engine number:
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This should be your parts manual: (3.01 Mb)
http://www.briggsandstratton.com/document/index.aspx?doc=MS3728_G_LO.pdf

Most likely the main fuel jet orifice that is inside the threaded area of the Fuel float bowl nut has debris in the pin-hole of the orifice.
Remove the Fuel float bowl and spray carb cleaner using the spray tube directly into the center of the bowl nut area to remove the debris from the main fuel jet orifice. Clean the Fuel float bowl and the bowl nut. On this unit the bowl nut acts as the main fuel jet so any debris in the bowl nut will restrict fuel to the engine. See items 117, 118 and 236 on page 3 of the manual above for location.

Additionaly make sure the fuel shut off on the bottom of the fuel tank is working properly Remove the output hose and check for feul flow. (item 958 bottom right page 3 of the above link)

I think once you clean the float bow bowl and nut that it should work properly. If your still having problems I need to know if this has a primer bulb, Choke Lever or is an Auto Choke carb.

Thanks for choosing FixYa,
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1 Answer

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I get the feeling that this tractor sat ilde for sometime and your now trying to get it going again. When a fuel system sits for a very long time with fuel the fuel in the float bowl and carb will turn into a shellac and really gum things up. Worst case you remove the carb and soak it in Chemtool B-12 overnight / couple of days then rebuild it using the kit above. (You will be glad that you did!)

You can get a new fuel cap here:
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http://www.ytmag.com/store/parts/pics/wm_2NAA916061_.jpg

I have spent hundreds of hours on one of these... doing large garden work back in the day and moving hay in several different ways. (Brings back some good memories and makes me ponder where that tractor is today...hmmm..)

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