Motorcycle Repair: No fuel to the spark plugs, honda cb350, float bowls


Question
QUESTION: I have a 73 honda cb350 and just cleaned both carbs because each had throttle stuck (seperate times) which caused fuel to flow out the over spill line.  Now I have everything back together and cannot get it started.  No fuel gets down to the spark plugs.  Any idea what I am missing, all I did to the carbs was clean them out with carb cleaner and put them back exactly the way I took them out on.  I must have done something right because I don't have a fuel leak anymore when the fuel is on and the throttles don't stick like before.  I am out of ideas and don't want to take the carbs out again.  But when I take out both plugs after attempting to start it for about 5mins there is zero fuel in there.


ANSWER: A sticking throttle will not cause the carbs to overflow.  Sticky floats will.  It sounds like you have got the floats released, but you still have blocked jets.  The carbs will have to come off again and you will need to clean the jets out properly.  Once all the jets are clear, and fuel is coming up to the right level in the bowls, you should be getting fuel into the engine and it should fire.  Good luck,  Jan

---------- FOLLOW-UP ----------

QUESTION: Any hints on how to clean the jets?  When I took the carbs out I basically just shot carb cleaner inside both sides and then took the bottom off where the floats are and just sprayed around then.  I pushed up and down the floats until I saw the pin fall as fast as the floats went up and down.  The pin was sticking originally and not dropping when the floats were in the down position.  

So where are the Jets then, because I didn't do anything else.

Thanks again for you time.

Answer
There are typically two jets in these carbs, a primary and a secondary.  Then there is also an idle circuit with a seperate air supply, adjusted by the air screw.  So take the carbs back off, take off the float bowls and look in the center of the bowl, you will see a brass round piece with a slot in it.  This is the primary jet.  next and close should be another one, this will be a smaller one and this is the secondary jet.  Don't mix them up they are not the same size.  I'm not sure on the CB350 how the idle circuit is run, but spraying carb cleaner through them typically will not fix the problem.  I put mine in carb cleaner an an ulrasonic bath.  Good luck,  Jan