Found these in a set of reeds i have, i can only assume that they are 33bhp restrictors. Can anyone shed any light on this??


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If you dont like the way that i ride.....Stop trying to keep up!!!!!

i they are called stuffers, reed stuffers were designed to increase fuel/air velocity.

Take them out and you will have 33bhp!

They are called reed stuffers as Fenton says, They are designed to increase the speed of the air fuel/mix entering the engine, you get different style ones such as the HRC ones which are smaller still to increase the air/fuel mix further. Remove them and you will find out just how important they are!
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If I have to take the carbs off once more...

Surely they're just normal rectifiers? HRC (and Tyga) do hi-flow ones, Andy used to list them in the shop too.
See pic here
Wow replies galore in about 2 mins!!!!
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

Thanks for the replies guys Still getting used to this high perfomance 2 stroke lark

I've got an sp motor that i'm soon going to be bolting in, should i fit these stuffers if theres not any already in as from what i can see in the parts manual they are not a standard fitment.
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If you dont like the way that i ride.....Stop trying to keep up!!!!!


Last edited by mick on Sun Feb 19, 2006 9:55 pm; edited 1 time in total

I never said they were HRC ones, you stupid boy Get back in your box and read your PM's
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If I have to take the carbs off once more...

They are fitted as standard to all MC21's so should be in there, The '18 has them built into the inlet manifold so can not be replaced, unless cut off and then fitted with the '21 ones.
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If I have to take the carbs off once more...

S'funny, 'cos I bought a valve for my CR500 and according to the website and other info they were supposed to run without rectifiers. The site shows flow numbers compared with other valves etc and there's seemed to flow more.

When I fitted them I had great fun trying to jet it. Eventually went from around a #165 main on the standard valve up to #210. I then epoxied up the inside of the valve and cut it into what I thought was a better flow path and again needed to rejet. This time settling on a #200. The new 'flowed' valve offered the same top end power but with better low end throttle response. Proof enough I think that the rectifier does it's job, which is to keep intake velocity high.

I've also found that if you reduce the actual cross sectional area of the valve (i.e. add epoxy to decrease the hole size) it again increases bottom end power, but at the expense of extreme top end. Probably due to becoming a restriction. Gave a very similar effect to fitting a smaller carb.

Matt@TYGA wrote:
I've also found that if you reduce the actual cross sectional area of the valve (i.e. add epoxy to decrease the hole size) it again increases bottom end power, but at the expense of extreme top end... Gave a very similar effect to fitting a smaller carb.

Well useful then... NOT!!

I guess that's one modification neither of us will be making Matt?!
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