1973 Honda CB450 carb problems

carb has stopped up jet or bad plunger Rework carb or replace Good Luck Mike L.

Hey Dutch, have you tried anything like starting fluid to see if it will run..If it will not run, try removing the fuel line going to the carb..(does this carb have a filter in the inlet fitting???)..once the fuel line is loose.. (BE CAREFUL!) ..try starting the engine and see if fuel is pumped through the line to the carb...if you are not getting gas there.. time to work backwards until you find the problem..(does this engine have the fuel pump mounted on the side of the engine,if yes.. remember the fuel pump has to "pull" the fuel from the tank)..If you are getting fuel TO the carb.. make sure the carb is "taking" the fuel..(inlet filter).if you are getting fuel to the carb,, and it will still NOT RUN..(and won't run using "starting fluid")..its time to start looking for a timed spark..(assuming the engine has compression).. when you have done this, reply back to me on here... thanks... please mark as helpful.. Good luck..

ask a questions.
like, my 1973 civic carb is bad.
what can i do?
1: clean it. and kit it and then calibrate it.
or
what is this part here (link a photo , with finger pointing)

Carb diagram:

http://www.bikebandit.com/houseofmotorcycles/1991-honda-xr80r-carburetor/o/m3143sch10211

Manual:

http://www.bikebandit.com/1991-honda-xr80r-motorcycle-repair-manual/n1330?m=3143&f=2

are your plugs fouling with oil? then you may have a valve or ring problem, if you are burning the plugs up your fuel is too lean. also, make sure your timing and all with distributer are good

change condensor clean points . check point wires at plug conn and hot wire plug at coils 4 oxidation check coil ground

make sure the solenoid on bottom of carb has power to it and or remove float bowl and clean carb

start with exactly the same settings as the left side carb, count the turns in till the air screw bottoms then wind it back out to the same position, then do the same with the right carb, check the jets and needle setting is the same.
check the lift that the idle screw is opening the slide by putting a small drill bit shank under the slide the exact size of the opening, then put the same drill bit shank under the other slide and adjust the idle screw to the same opening. I think it has duel cables so make sure the free play in the cables is the same.
If you pull a spark plug lead off, put a spare plug in it and ground it to the head, the bike should run on one cylnder for fine tuning, then tune the other side.
two vacumn gauges if available can help setting the idle ( called carb syncronizing)

It is better if you look again into the carburators, it may just need blowing of the jets by compressed air and the idling vent.
You will have thn to reset the air-mixture screw.
Please visit this site it may be of help...
http://cycles.evanfell.com/2008/09/how-to-clean-a-motorcycle-carburetor-the-right-way/

Thought I answered this...Pull off the fuel hoses at the valve and check that flow stops in the off position. Remove the 10mm head sediment bowl and check for dirt/rust. Sounds like 2 float valves are leaking because of dirt or foreign matter. Pull off the float bowl drain hoses on the carbs and loosen or remove the drain screw to check the fuel condition.