Gas running straight through the carb, float needle still intact
Gas seems to be running straight through the overflow in my carb. I took it apart several times and comparing the float needle to the service manual it seems to be in perfect shape. It doesn't seem to want to seat, but I can get it to work for a while by positioning it but it always seems to go back to the same problem. Could this be the jet needle? Or maybe the carb itself? Or maybe there is something i don't see with the jet needle. I know there is not much to carbs, but everything looks ok from my point of view, if anyone could offer any insight that would be much appreciated.
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Hi Paige, Seems like the problem is where the float and needle meet, The needle and seat let the gas into the bottom of the carby and as the gas rises the float rises as well pushing the needle up into the seat slowing the gas flow into the bottom of the carby.... As the motor's using the gas in the bottom of the carby the float's lowering and the needle lowers as well allowing gas into the carby, If the part of the float that meets the needle is bent down slightly it's going to let more gas into the bottom of the carb because it's not pushing the needle up when it should, YOU NEED TO BEND THAT PART OF THE FLOAT UP SLIGHTLY TO STOP THE GAS COMING OUT THE OVERFLOW.... I hope you know what I mean....CHEERS..
Yea these carbs can be a real pain sometimes to get right. First thing you need to do is varify the float seat is working and totally stopping all fuel flow.... and all the jets, main, pilot and choke circuit are absolutely clean. Bench test the float needle valve by connecting a hose to the carb fuel line nipple and letting gas gravity feed as it would in a run position. if it tests ok, remount it on the bike... i'm guessing you have a vacuum petcock on this year model? If you do, it needs to be inspected. In the "on" position you should have no gas flow coming through the petcock, In the "prime" position it free flows. If there is a hole in the diaphram the engine will **** gas and not air (vacuum) through the hose and it will flood. If you don't have a vacuum line on your petcock then it is a different kind. Be sure to check your crankcase, it could be way past full with gas that has entered, dont start your engine like that...drain it all out. make sure the air filter is dry. You will have to replace the spark plugs...a gas soaked plug won't fire. Good luck, i hope this helps.
your floats are sticking and overflowing out the back of the carbs.
your overflow tube in your float bowl must be clogged, otherwise the gas would run on the ground throught the drain tube.
Clean your carb really good and you shouldn't have any problems.
I recommend taking them apart and soaking everything overnight.
Take the jets out and the float&needle and soak the carb bodies, jets and screws.
After soaking rinse with water really well.
After rinsing, blow through every opening in the carb bodies, blow through each jet, and make sure you can see through them and through the little holes in the side of the main jet.
Reassemble and should work like new.
If your floats are still leaking, you make have to buy a new float needle valve.
Try the cleaning first.
As for the carb soak, you can purchase it at any local auto parts store for approx $22.00
It would appear that the float is not shutting off fuel flow when the bowl is full--take off the bowl, remove the float and needle valve. Turn on the fuel for a moment to wash out the needle seat, clean the needle tip and reinstall the parts you took off. If the float is brass, shake it to listen for fuel inside the float. If there is, replace it. Plastic floats don't have this problem. Hope this helps!
sounds like the float and needle are not working proper. The float :floats in the gas bowl raising and seating the needle into a jet hole. If the float has quit lifting the needle out, then no gas will come through to reach the carb. This is why you engine runs with carb fluid because you shoot straight into the carb. Try replacing those 2 and clean the carb. It's a simple task and cheap fix.
well it sounds like the float needle is not shutting fuel off whin the bowl is full of fuel you can lightly tap on the bowl of carb an that may make it stop what has happend is the bike has sat you may need to run a little fuel treatment through it or sea foam and that may clean the end of the needle off the way it works when the bowl of the carb fills with gas the float raises a needle valve into a brass seat and stops fuel flow into the carb fuel get old and starts to develop a tarnish on that nice pionty valve an then it won't stop gas the overflows just prevent to much into the motor try some fuel treatment and run it it may fix it self just from fresh gas an being driven worst case is having to clean your carbs still not to bad hope that get you fixed up
Has the bike sat for long preiods ??
sounds like the float is sticking..
Try and get some carb cleaner into the tub..
If that does not work you might need to get the carb cleaned and/or rebuilt..
If doing that - would be a good idea to do all 4...
You describe a problem with either the float or the float-needle and seat. If the needle is not seating then the gas flows past it. If the float has a pin-hole leak, then it will fill with gas and sink.
On some bikes you can remove the carb bowl without removing the carbs. If so, slide the hinge pin holding the float to one side and remove. The float will drop straight down. Catch the needle since it is now loose. Unscrew the needle seat with a socket.
Clean all metal parts in carburator cleaner...do not get carb cleaner on any rubber part. Shake the float and listen for gas inside or see if it floats in water.
Test the needle seal in the seat by blowing gently thru seat. Needle must seat completly with very little pressure holding the needle in the seat.
Re-assemble with new bowl gasket if damaged. A carb rebuild kit ($35) might be available for 1973 carb and contains all new parts instead of cleaning. Kit might even contain new float and float adjust guide.
Avoid adjusting float level if re-using the old float. If using new float, temporarily install old and measure distance to carb body. Install new and match this measuremnt. Bend tang to adjust.