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CB750 mpg
Spitfire:
Touring around Wales with a friend at legal speed limits I got 48 mpg from my F1, the carbs have not seen any new parts since I bought the bike new in 76.
Cheers
Dennis
MrDavo:
As an update to this thread, I changed the coils and HT leads, which had got hard with age and 'hollowed out' at the plug cap ends.
What a difference! - the flat spot at low revs, with occasional temporary lapses onto three cylinders, and the hard starting from cold went away, and mpg is now around 41mpg, which I can happily live with.
sprinta:
--- Quote from: MrDavo on August 07, 2017, 11:19:51 AM ---As an update to this thread, I changed the coils and HT leads, which had got hard with age and 'hollowed out' at the plug cap ends.
What a difference! - the flat spot at low revs, with occasional temporary lapses onto three cylinders, and the hard starting from cold went away, and mpg is now around 41mpg, which I can happily live with.
--- End quote ---
What did you change the coils with, new original pack or a pattern set?
Moorey:
--- Quote from: Skoti on April 30, 2017, 08:40:51 AM ---I only ask because my F1 also had poor fuel consumption of around 35mpg when I first bought it.
After a service and tune up including carb synch the fuel consumption problem was still the same.
Met a bloke on a F1 at the Moto Piston rally in Santander and he told me to renew the needle jets with genuine Honda items. He said they would need renewed about every 12,000 to 15,000 miles to maintain decent fuel economy.
He was correct, on a recent 3,000 mile round trip to Ireland I averaged 52mpg. :)
--- End quote ---
Is that just the jets or needle and jets.?
Last tank of fuel on my F1 worked out at 40.2mpg but more often than not 37-39 but I am not exactly gentle with it.
MrDavo:
--- Quote from: sprinta on August 07, 2017, 07:20:50 PM ---What did you change the coils with, new original pack or a pattern set?
--- End quote ---
Original Honda, from DS. £ horribly expensive, but worth it if they last another 45 years.
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