1/22/2024 0 Comments K series velocity stackWith luck I may be able to produce some empirical evidence on whether power is changed at some throttle opening, but I doubt I can get reliable data. I should have a chance to try both setups tomorrow and report my own impressions. My intuition agrees with the idea that a reduction of turbulence helps to smooth out slow speed running, including during quick throttle movements. So I guess my original question has been answered in a way: there must be some noticeable difference with them installed. After all, they are invisible inside the filter. But one thing is clear, they must make some difference or Dellorto and Guzzi wouldn't have bothered with them. There are different opinions on where the stacks make the most difference, it seems. With the stack installed, there is just a smooth tapering bore right down to the needle jet opening. The carburetor was never designed to be used without a stack of some kind. One thing that seems evident to me now that I have installed my new stack is that the stack is essentially a part of the carburetor. The R-0642 and MG-2640 are hard to find in stock, and may be out of production, I suppose. Once I get the new parts I'll be able to make my own comparison, and will post here again.Īlso by the way, Greg Bender has an interesting set of comments on various possibilities, here: K&N is ginning up filters from a stock of standard parts, I believe. I'm sure it works, but I would rather spend the money and save the bother.īy the way, that last one, the MG-2640, appears to be the same as my R-0642 filters, except that it has inlets on both ends. I did consider the single shared filter, MG-2640, but rejected it because the inside flange diameter is 38mm and because of critical comments on the Amazon page about its symmetry not fitting well on the Guzzi's asymmetrically-positioned carbs. New set-up: MG Cycle velocity stacks, individual RU-2450 filters (inside flange diameter 44mm) So now I can test for the benefits of the stacks by swapping from my existing set-up:Įxisting set-up: no velocity stacks, individual R-0642 filters (inside flange diameter 38mm) To update, I ordered the individual K&N pods RU-2450 from MG Cycle (and they were shipped right away!). Thanks for a set of uniformly good and on-topic responses.
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