How does a restriction kit affect power?

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Does a restriction kit with inlet washers reduce power throughout the rpm range or just at the top end?

[davebike]

They mostly only effect the higher power parts of the engines performance I ridden restricted bike where you hardly notice it others have had flat spots but that is rare and I think why the current rules restrict the max power you can restrict from
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Dave
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[Beehive Bedlam]

If you're talking about an A2 license don't bother no one can tell by looking at it as long as the bike in question falls into the A2 category to start with.

Now don't go thinking you will get away with an A category bike on an A2 a Fireblade for example all as you'd be doing is dramatically increasing the chances of getting caught riding otherwise in accordance with license.

[zark]

my fazer 600 had washers in when i got it...

Seemed to run fine, picked up nicely and just ran out of puff around 70mph (ish)

I only rode it for half an hour though before removing them, but i do remember thinking - 'this is actually pretty quick enough' with them in while going up through the gears.
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[Wonko The Sane]

my zzr600 could get a bit asthmatic if you tried to wind the throttle on too quickly as the airflow was restricted, steadily winding it on and it was fairly happy.

Still enough to beat a porsche up a motorway slip road.
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[temeluchus]

Now the restriction is at a sensible value, not a great deal.

The restriction will only make much difference when you are caning it or trying top speed runs.

Certainly far less soul destroying than the old 33hp restriction.
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[pdg]

I can't believe nobody has answered the question in the title yet.

[Dabura]

The bandit seemed to loose a bit or torque at 5-9k but still got a fair shift on and still had plenty of pull at motorway speeds and then some. It didn't feel like it choked the bike it still revved smothly and accept a thrashing without spluttering and wheezing just that loss of midrange that was most noticable

[Kickstart]

Hi

On a bike with CV carbs, should act pretty much like the last half (or so) of throttle as zero effect.

All the best

Katy
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[Ariel Badger]

I have never understood why anyone would want to ride a restricted bike. A 600 that does 65 is no better than a 125 that does 65 except it is heavier and less nimble.
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[dydey90]

[Tdibs]

[talkToTheHat]

535 would get a bit wheezy. Perhaps with the restrictors in, i would be changing gear about 1000 rpm earlier. That was 33bhp from a claimed 46bhp by restricting the exhaust down to about my thumb's diameter.
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[The Shaggy D.A.]

[-Matt-]

My ZX6 was restricted to 33bhp for a while with inlet washers+throttle pin.

Would still shift nicely in the lower half of the range staying in lower gears but then it would bog down massively or the throttle would stop once you tried to exceed it further. Noticably slower compared to it unrestricted now regardless, but it was enough for comfortably overtaking most of the time and getting ahead of cars at the lights.

Would get upto about 110 just. On private roads etc etc etc

[Conzar]

Restriction is shit, you'll get bored after a week.
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[Copyhat]

My first bike was an A2-restricted Honda NTV650. The kit consisted of rings mounted between the carbs and inlet ports, I could feel a bit more torque when the bike was stock but only in the last 1000 RPM range. Top speed and fast motorway cruising was somewhat easier but 48 HP was quite alright.

My second A2-restricted bike was a Kawasaki GPZ500S. This time the kit consisted of a throttle travel restrictor which killed the bike's feel. The powerband would normally kick ind hard at around 7K revs, but the kit kinda ruined it. 0-100 km/h reached about 3 seconds slower and top speed was 160 km/h instead of 210-ish.
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Past: '91 Honda NTV650, '93 Kawasaki GPZ 500S
Current: '91 Honda VFR750F, '83 Suzuki GSX400F

[Wafer_Thin_Ham]

Restriction was wank in my day. 33bhp meant most bikes couldn't fight their way out of a paper bag. Fortunately mine and many other's restrictors fell out quite quickly.
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[stevo as b4]

The trick was to buy a light bike that fell under 33bhp or else pick something that would restrict well like say a cbr250, cb500s or a bros maybe?

Though you could restrict anything which was quite how it should be, the people with 33bhp blades or hayabusas were doing it all wrong!

[Fladdem]

I've never owned a restricted bike, as far as I'm aware, I sometimes have my doubts about the CB400, but I then remember it doesn't have much anyway.

I just bought a 22bhp crosser, the only time a policeman actually questioned the power output, his bummer colleague actually owned a TTR250 and confirmed for me that it was nowhere near 33bhp.
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Current:1991 Honda MT50 (Soon to be a H100/MTX/MT5 hybrid), 1976 Honda Cub C70, 2005 Honda Varadero 125, 1993 Yamaha TTR250 Open Enduro , 2010 Road Legal Stomp YX140, 1994 Honda CRM 250 MK III, 1999 Cagiva Mito 125, 1992 Honda CB400 Super Four, Stomp T4 230, 1984 Honda H100s, 2009 Sym XS125K
Past:2003 Aprilia RS125, 1982 Kawasaki GPZ550(FREE BIKE!)
I'm having more fun than a well-oiled midget.

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[talkToTheHat]

[temeluchus]