Here

Only £30 no bids... they looks clean too

Doesn't the HRC NC30 setup have a drilled airbox base?

Druid

Good point! Well it has the rounded sliders and the shorter velocity stacks at least.

I'm curious to know if there is any real difference between the HRC stacks and a cut down set that have been nicely radiused (like what I have).

I do love the sound of our track NC35 as the induction noise is *FAB*.

Druid

The drilled carb bracket is a DIY job - not everyone does it. There is a huge difference between cut-down standard stacks and the HRC items. Mainly the absence of the shroud that covers the main air jet. If you cut down standard stacks, you have to restrict the main air jet or it'll run very poorly up top. The HRC stacks also sit much flusher to the carb bracket for effficient airflow. Strange that the metal washer thingies on the bracket haven't been removed.

superlite wrote:The drilled carb bracket is a DIY job - not everyone does it.

Yes it is but it's also part of the HRC manual for the VFR400

There is a huge difference between cut-down standard stacks and the HRC items. Mainly the absence of the shroud that covers the main air jet. If you cut down standard stacks, you have to restrict the main air jet or it'll run very poorly up top. The HRC stacks also sit much flusher to the carb bracket for effficient airflow.

<shrug> I shall have to see if ours has the main air jet restricted or not, it's certainly got cut down std stacks and runs rather nicely up top! I suspect you are right and the HRC ones would be better but I'm curious to know how much by. I'm not about to buy some (if you still can) just to find out though!

Strange that the metal washer thingies on the bracket haven't been removed.

Looks like they've swapped the bolts for stainless though and reused/replaced the lock tabs.

Druid

I'm not about to buy some (if you still can) just to find out though!

They're unobtanium. When they do turn up on eBay or Yahoo Japan, they always end early.

There's not going to be a noticible difference in performance between HRC stacks and cut-down stacks. It's easier to set up the HRC stacks though because you don't have to worry about the airjet. I'm talking in terms of full HRC spec set-up. Got no idea how they would work if used with an airbox/filter standard jetting/needles etc.

superlite wrote:If you cut down standard stacks, you have to restrict the main air jet or it'll run very poorly up top.

Yes, I have full hrc carbs, this is why the hrc velocity stacks are important.

Without the hrc stacks you can always jet it big up top to run fine, but the midrange will suffer without fine tuning of the air jet because there is too big a transitional period between the needles and main jets.

If you want to run an open airbox without the hrc velocity stacks then reducing the air jets is necesary. Rvf carbs don't require this so much.

I have a new set of genuine HRC NC30 short velocity stacks in stock - still in their original packets:

£200 the set inc VAT.

Recorded insured UK delivery - £15
Ditto worldwide - £25

Paypal is fine to

franceandliasiatrading@tesco.net

Cheers
Graeme
Tel 07778 628448

carbs sold.

Michael