[FONT=&]If I place a digital level gauge against the rear 276 bellmouth on my '51 Rapide, it shows the rear carb has about 5.8 degrees of downdraught. The front 276 has about 1.2 degrees of updraught.
This is assuming the bellmouth is perfectly square to the bore of the carburettor of course.
However, when I used a sight tube to check fuel levels, it showed that moving the rear float chamber fore and aft had a big effect on the fuel level, whereas move the front float chamber only slightly changed the fuel level, confirming the above measurements are correct.
So is this some quirk of my bike or are all twins like this?
I can find no mention of it in MPH or elsewhere[/FONT]
This is assuming the bellmouth is perfectly square to the bore of the carburettor of course.
However, when I used a sight tube to check fuel levels, it showed that moving the rear float chamber fore and aft had a big effect on the fuel level, whereas move the front float chamber only slightly changed the fuel level, confirming the above measurements are correct.
So is this some quirk of my bike or are all twins like this?
I can find no mention of it in MPH or elsewhere[/FONT]