Question about Honda CB 750 Motorcycles
Hi, l have a CB 750c which is overflowing on the no. 4 carb only a drip but it won't stop, I have replaced needle valve but no luck. Any ideas?
Hi, Louis and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
8. Damaged petcock diaphragm allowing fuel to flow through the vacuum line into the combustion chamber.
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Carb is leaking from overflow Why
1981 Honda 750 carb leaking
Honda CB750f2 Manual
Honda CB750F2 Owner Manual
Posted on Aug 09, 2017
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Posted on Jan 02, 2017
Have you checked the float level in the float chamber?
I guess you may have to reset the float pin adjustment, its allowing more gas to pass through thn required and thus the overflow!
Not bad too, when you are working on the float assembly take the opportunity to blow out the fuel line from petcock to the carburator via the seat for the float pin,any foreign particals there would stop the float pin to seal up and thus overflow.
Fit in an inline fuel filter , this will help keep out the dirt or whatever.
Hope this helps.
Knight (Yamaha Seca XJ750A 1981)
Posted on Feb 13, 2009
SOURCE: Cleaning Carb Jets
not to a trained ear also go by rpm and spark plug color
NOTE: use copper wire to clean jets, sync is just thottles are same position as all carb's just leave them adjustments alone will be fine if are out use a 1/8 drill an place in between piston/butterfly to carb bore to sync/calibrate
better use a manometer for adjusting screws
depends on condition of org parts
worn = richer running
new = lean an clean
also if changed the exhaust system need to
re-calibrate carbs for max performance
Posted on May 09, 2009
Is your rubber seat possibly sideways?
Also take the float back out and see if has fuel in it.
sometimes the foat has gas in it and it drops down and the gas keeps coming in the carb.
Posted on Oct 26, 2009
Testimonial: "Found that the float was defective, replaced same also replaced seal in fuel inlet again set fl;oat 11/64 new bowl seal still leaked gas from overflo."
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