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In this episode of Roma Custom we will examine the difference between a Keihin CV carburettor and a flat valve carburetor, in my case a Mikuni HSR 42.
After making a couple of videos on the original Harley Davidson Keihin CV carburetor, I thought I would compare it to a MIKUNI HSR42, often used in transformations on these bikes.
The main difference is that while the former uses a throttle valve and the engine vacuum, the second has the accelerator cable directly connected to a flat valve. So the slide moves in direct relationship with the throttle handle.
During the video, in addition to showing with the help of an animation, the inner workings of both carburetors, we will examine the pros and cons of both the Keihin CV and the Mikuni HSR42.
CHAPTERS:
00:00 - Intro CV carburetor vs Mikuni HSR 42
00:50 - How does the CV carburetor works explained
01:11 - Graph of throttle response of a CV carburetor
01:38 - Why is it called CV (constant velocity)
01:50 - How does a flat slide carburetor works explained
02:44 - Graph of throttle response of a flat slide carburetor
02:52 - Graph comparing the throttle response of the CV carb to the flat slide carb
03:09 - Adjustment screw differences
03:30 - Pros and Cons of both carburetors
04:51 - Suggested settings for Harley Davidson 1340 engine
05:34 - The flat slide is noisy
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Related videos:
How does the CV carburetor works:
• How does CV carburetor...
How to restore and adjust a CV carburetor:
• How to tune your CV ca...
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Made in Rome, Italy we take a look at an European approach to modifying and customizing an Harley Davidson with Custom Cez, an amateur customizer in his home shop.
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