See how the stuffer (white plastic part) runs down the side of the reed cage the FL350 and 
89-90 Pilot stuffer looks like the one pictured here (second picture down on that page) see
how you can see the wall of the cage, then look at the picture below, the stuffer is a very
important part of the reeds cage assembly without the stuffer when the air/fuel mixture exited 
the carb and manifold it would enter into a large open area and loose velocity and kill your
throttle response, now the more you stuff the cage (stuff not restrict) the better your chances 
are at keeping the velocity up and improving the throttle response.

Here is some flow numbers I found on Mossbargers web page .
Honda CR/TRX/ATC25OR 6-petal 54.60 CFM (same cage found on the 89 Pilot and 85 FL350)
Honda CR25OR 1988/89 4-petal 57.12 CFM
As you can see the 88 CR250 cage flows 2.52 CFM more than the 89 cage

This cage is new out of the box, it comes with single stage fiberglass petals right from 
Honda for about 55.00 the price is right. It does not come with carbon fiber reeds and 
have a cool name like Rad Valve, Ram Valve or V-Force Delta 2 but with a little work 
it is a performer, since the sealing surface areas of the cage are rubber unlike others
you can expect long reed petal life.

In the picture below you can see the jagged edges around the reed openings, this is some of
the casting flaws I was talking about, although you can see them in the pictures if you run your
finger over the stuffer you can feel rough spots from the parting lines when the stuffer was 
moulded, there will be removed with 400 grit sand paper.

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