Hi Everyone
I want to put some hrc stuffers in my 18 is it worth getting 21 manifolds so i can use them and do i need 21 reed block as well or would i be wasting my time.
Thanks 4 any advice

Hi nsrdownunder,
You will find that HRC parts / specs related questions are generally only discussed in the HRC section for Ti Members. Worth upgrading from Carbon membership??
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30

nsrdownunder wrote:do i need 21 reed block as well or would i be wasting my time.
Thanks 4 any advice

My advice...

You`d be wasting your time, and you`d be better off typing "for" rather than 4!

There`s no excuse for saving characters on a message board, and laziness prompts lazy responses from admin and mods (who are the ones with the real answers), as you may have noticed by the lack of replies to a simple question!
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There`s no cure for stupidity… but with the endless supply of stupid people around me, I must be close to finding it!

The Lizard tells it like it is!

Read - Learn - Post... not - Post - Learn - Edit!

Vampire?

Or maybe no one has back to back tested them on the dyno and thus no one actually knows the answer?

The size and shape difference of the stock stuffer over the HRC one is pretty small, it and the HRC reed block itself have both got to be better than stock ('21, you'd think they'd be better than '18 too) but you're almost certainly not going to be talking about an amount you can feel or even see on a normal dyno.
There are also slight mods to the HRC reed block metioned in the RS manual that aren't in the F3 manual.

Some bright spark will probably now post back that they fitted the HRC reed block, reeds and stuffers and found a horse and the motor felt loads better. Yeah, that's mainly as they replaced their 15 y/o reeds with new ones.

So, my opinion* would be "wasting your time" unless of course you're replacing these parts due to wear and tear (which is nice, carbs pop into fresh manifold rubbers very easily and reeds do wear) in which case go head (though I'd use the '28 manifold and ditch the boost bottle too) but any improvement you find is going to be 90% from fresh reeds.

*guess, maybe the '21 reedblock and HRC stuffer is worth several bhp over the stock mc18 one, I've not tried it but I doubt it very much.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

My uneducated guess is that MC18 reeds and stuffers are better than the later MC21 ones.
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If I have to take the carbs off once more...