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velocity stacks 02 Apr 2015 17:02 #666270

  • kawi810
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has any body used velocity stacks on there carbs .do they work or just b**s*** like these i know they make them for a reason

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original owner of a 1984 gpz 750
1985 turbo 750 stock, being restored.
1984 gpz 750 with 810 cc wiesco's megacycle cams(471-10) 34 mm flatslides v&h pipe ported head dyna ignition. bottom end, crank case from turbo 750 and sprockets.
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velocity stacks 02 Apr 2015 18:28 #666308

  • zukdave
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Larry C. told me I should run stack's to make max power.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63" wheel base.

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velocity stacks 02 Apr 2015 18:56 #666323

  • KZB2 650
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Can't hardly remember seeing a record setting pro stockers or supper bike without em so I'd say they're bound to add a little........ a friend of mine used to run a 1170cc KZ for a few years and it had stacks with screens over em and I remember him telling me he ran them on the street but always removed them (the screens) at the strip cause he would pick up a solid tenth with em off. ;)
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

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velocity stacks 04 May 2015 02:47 #670603

  • turboguzzi
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depends on your state of tune carbs/cams/porting wise

I do use them in my road racers, help with the power dip around 5-6K

with different stack lengths you can alter the curve, shorter for higher revs, longer for mid range

essentially even the stock intake rubbers are stacks...

to get the most of them you'd need to try on the dyno

they sure look good though

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velocity stacks 04 May 2015 05:16 #670610

  • 650ed
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It also depends on how one plans to use the bike. Used for just a few miles per year on a relatively clean race track may not cause problems, but If one plans to use open stacks on the street it will soon decrease the engine's power as the road grit, etc. grind away like sand paper at the cylinder walls and piston rings. This is especially true of some modded bikes I've seen that have no fender or other shield between the rear tire and the stacks. In that case they suck stuff in at an accelerated rate and the engine can be damaged pretty quickly.

In this case there are some filter elements that cover the stacks, so depending on the quality of those filters the stacks may not suck in the road muck that causes problems. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Last edit: by 650ed.
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