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1975 CB400F ONLY FIRING ON 2

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OLIVER1GEORGE:
HI i recently purchased a 75 cb 400f it had been in storage for 10 years, when i got it i gave it a service ie. oil change filter ,plugs air filter gave the carbs a good blast of carb cleaner a new battery and she fired up when i kicked her over but she sounded like a v twin ducati not good any ideas . no smoke at all when she starts but just wont fire on all 4 there is a spark on all plugs can anyone help or give advice many thanks

Dave M:
The carbs will need stripping and cleaning thoroughly if it's been standing that long.

OLIVER1GEORGE:
had carbs off  give them a good clean blew them through with compressed air put them back on and i was so happy it fired on all four but now i have another snag it smells really rich and white smoke from exhaust its allmost as though it is burning pure fuel any idea what i have done

Dave M:
Did you take all the jets out of each carb body for cleaning? You may need to soak each one in cellulose thinners before blowing them out with carb cleaner and compressed air and then check visually.

Did you clean the internal drillings in each carb body?

Are the floats OK? No petrol inside them? No leaks?

How about the float heights? All checked and set correctly?

Any leaks from the carb overflows when the engine's not running with the fuel tap on?

Pilot screws set to manufacturers settings? May need tweaking.

Is the air filter clean? Try running briefly without the filter and see if there's any improvement.

Carbs can be so fickle and difficult to fettle when they've been standing for a long time with fuel in.

Good luck.

OLIVER1GEORGE:
i will take um off again and give them a real good going over im so close the engine sounds really tight and nice just running rich thanks for your advice i will get back to you and let you know thanks

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