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Hi, I am new to Cafe Racers, I have a few bobbers but now I want to try this out.

I have bought a good condition Kawasaki GPZ 550 1985 and I am really looking forward to begin.

I have a question regarding carbs, I have seen these vintage carbs that has no air filter, the seem to have a open air intake.

Can someone help me identify what this is and how this works. I would love to know where to buy and how this works, is it more powerful or less powerful?

Here are 2 photos.

p1010898cx.jpg yamaha_xjr_monkeefist_wrenchmonkees_4.jpg

All help is appreciated.
 

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They are after market velocity stacks. If tuned properly they flow more air. Without tuning they will make less power across the board but make more power in certain rpm ranges.They also flow more dirt and stuff that is very detrimental to an engine and will wear it out prematurely. Your carbs will need to be rejetted to make them work correctly.
 

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They are after market velocity stacks. If tuned properly they flow more air. Without tuning they will make less power across the board but make more power in certain rpm ranges.They also flow more dirt and stuff that is very detrimental to an engine and will wear it out prematurely. Your carbs will need to be rejetted to make them work correctly.
yup. I just want to add that:

-not all cabs can be made to work well without intake runners (that rubber tube from carb to airbox) and airbox.
-lots of fools put these on street bikes where they make zero sense
-some of these fools put steel meshes on the stacks (like your 1st picture) which will mean that they flow significantly less than straight open tube. So even theoretical gain is absolutely lost.
-if you need to ask what they are its unlikely you can make justifies calls about tuning them/with them even for track use

GPZ should be made into a superbike rather than a cafe.

And if you have read around this forum before rushing for your 1st post you know that on this site actual functional improvements are considered way more relevant than aesthetics.

look the part vs. play the part. -what do you wanna do?
 
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