SOHC.co.uk Forums > CB750

CB750F1 Carb. Balancing ....

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CR750:
How often guys do you reckon carbs need balancing ? especially PD carbs , or are they best left alone unless you know or suspect you have an out-of-balance

Bryanj:
If you keep the standard service items spot you should rarely need to balance carbs HOWEVER if you dont run it for 4 weeks you may have to strip them and clean all the jets and pathways.

philward:
In my experience - when I used to do decent mileage on my Honda Fours in the 70's - was that they didn't go out much and the amount they did change, when adjusted, made little difference in everyday running

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CR750:

--- Quote from: Bryanj on January 02, 2019, 10:46:59 PM ---If you keep the standard service items spot you should rarely need to balance carbs HOWEVER if you dont run it for 4 weeks you may have to strip them and clean all the jets and pathways.

--- End quote ---

I agree in part, you certainly have to run the engine quite often during winter lay up.
I have had my CB750 for almost 5 years, it is my 1st Honda, it was completely rebuilt at the time. I have had issues with the carbs initially in my learning curve with this bike, I learned that you must keep a good quality petrol in the bike [no ethanol if possible]+ a Stabiliser, also keep the tank at least 3/4 full at all times specially during a lay-up & then during the winter period start the bike at least once a month & allow the engine to really warm up,i've never had to strip the carbs as yet I got away with occasional carb cleaner...also having the correct spark plugs is important, I now run with the NGK D7EA & all is good so far, previously tried many others including iridium

Arch stanton:
I'm sorry but I could not disagree more.
The most wear on a engine occurs in the first 5 mins of running. Also filling the exhaust with corrosive condensation.
Plus contaminating the oil.
I have 14 bikes 2&4 strokes & never have a carb problem.
I only use BP ultimate petrol. And prior to laying up for winter.
All I do is. Switch of the fuel. & open the carb drains screws.
& leave them open. Never a problem.
Sean.

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