Double stack- hold the cheese

[PowerDubs_imp]

As some of you know- our bikes have 32mm throttle bodies but neck down to 26-27 mm by inserting narrow velocity stacks deep into our TB to choke it down (sorry I forget the size exactly- been a while since I measured).

The TB themselves have a lip cast into them to accept larger ‘normal’ stacks as these same castings are used in several other bikes without the choking- meaning they have larger velocity stacks- even on much smaller bikes.

TSR has larger stacks for our bikes made that fit into the groove- but are pretty expensive.

I have had good results just by boring the ID of the stock plastic stacks- but as always, a hot rodder wants more.

Thing is- I try to be an intelligent hot rodder- and gain power without sacrifice. That is much more difficult.

To date- I have achieved 103whp and over 75wtq.

I could just get the TSR stacks to open up the breathing- would probably gain hp- but might drop a little tq.

What if I could possibly improve both?

That brings us to where we are now-




Many more expensive high end sport bikes have used dual stack for years now to have both high end flow but maintain velocity at lower revs.

Like anything else- it’s not that Honda wasn’t aware of this- they just didn’t see a need, or cost.

I’m pretty excited about this one.




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And where we are now as the 'before'-