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brith

Joined:

Nov 10

Posts: 3

brith says:

carb flooding

hello

A few months ago I bought an early 1960s c90 that had been standing for a while. I had the carbs ultrasonically cleaned because it wouldn't run. It now runs very irratically and the carb is continually flooding petrol from two rubber tubes. One tube is at the bottom of the float bowl the other is at the top of the carb. Does anyone know what might be causing the petrol to run out of these tubes?

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  • Posted 2 years ago (06 January 2013 10:33)

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jaffa90

Joined:

Mar 09

Posts: 8785

jaffa90 says:

flooding

Sounds like the needle valve operated by the float is not shutting off the fuel,the float may not be floating or the valve seating may have a foreign body in it (crap really).

Also does the fuel tap shut off?

Has an inline fuel filter been fitted?

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ricklincs45

Joined:

Aug 05

Posts: 9

ricklincs45 says:

Flooding

Best way of solving this would be to buy brand-new, genuine Honda needle valve, needle valve seat and float (most likely made of brass on your bike).  Try David Silver Spares, they're probably your best bet for the parts.


Worth also replacing the jets (especially the pilot jet) if you can get hold of them too.

Rick

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Meatbingo

Joined:

Jun 12

Posts: 307

Meatbingo says:

Pattern carb

You can buy a whole replacement carb for between £20 and £40 depending on which model. As long as the mounting hole centres match you can get away with 18/20 mm intakes. 

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brith

Joined:

Nov 10

Posts: 3

brith says:

carb flooding

hi

thanks for all the advice. I have stripped the carb and cleaned it with a combination of pipe cleaners and compressed air. I put the float into a bowl of petrol but it sank to the bottom, no sign of any air bubbles but I noticed that the float has been repaired about five times in the past and I wonder if all these repaires now mean that it is too heavy. I think that I will try to buy a replacment float and see what happens.

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