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Is ther an advantage to CV carbs?

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Recently  upgraded from the faithful old 79 XR500 to a 90 NX650  (Ok, I like dinosaurs!). 

  XR has the original round slide, non pumper carb and runs perfectly (only glitch is crackin the throttle to fast, not a biggie)

  NX has CV and it seems un-necessarily complicated. Have fiddled a fair bit ,Daves mod etc, and it runs ok(ish).

   Has occasional hanging idle, grit gets stuck on the rediculous roller on the right hand side when on metal roads, diapram issues etc.

So, whats the big advantage? Just to  minimise the WOT bog?? Thats like crackin a walnut with a post hammer!

    Yes, I know the FCR is an awesome upgrade buts even more complicated! Got a DRZ400 with one, and once sorted, its great,

But hardly fixable way out in the boonies either.

   Not having a moan,, just trying to sort bike for safer expeditions! 

                    Cheers.

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The CV carb is less complicated than a pumper carb...........but it`s main advantage is it compensates for altitude changes better

 

than most carbs......

 

but it is slow as hell reacting to throttle changes......and has no business on a dirt bike,,when you wack the throttle to lift the front wheel to clear a log...you actually would like the carb to actually do it :jawdrop:

 

B

Edited by brianhare
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The FCR-MX carb is not that complicated, all its got is a AP circuit which once set is good for ever.  Two of the benefits are the greatly improved throttle response which sucks on the CV carb.  Also you no longer get the sticking throttle problem with the new slide design.  If you really had a FCR-MX pumper carb before than we shouldn't have to convince you of its benefits :)

Edited by D0T-C0M

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The advantage to a CV carb is really only if you want a huge carb with max flow that would bog at the slightest more-than-part-throttle provocation.

 

The NX and the XRL CV carbs are both not big enough to warrant the CV... and neither bike revs high enough to ever make use of a carb that big...

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As brian stated, the advantage to a cv carb is the increased probability of bent front rims and over the handlebars freestyle demonstrations. But they are smooth and predictable on the road and can allow the bike to handle leaner jetting (over simplification) for emissions reasons than a mechanical carb.

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