riding after test on a retricted bike

[retrobiker]

so i am due to take module 2

i am currently riding a cg125... great bike

but i have this other bike a honda cb550 f2 77 vintage

i know i would have to take it easy but would like to take it out every now and again when i have passed the test

if i am right when new many moons ago it had roughly 46 hp,

so question is..... is it possible/ how to restrict the bike to 33hp

take it no "kit" exists for a bike this age so what to do

[N cee thirty]

i wouldn't bother tbh

you could maybe fab up a throttle restricter and get it to 33hp on the dyno
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Rogerborg]

Other 4 cylinder engines want approximately 15mm holes in each of 4 restrictor washers to get them down to 25kW/33bhp. Might as well start there and get on a dyno.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Kickstart]

Hi

I suspect the CB550 uses slide carbs and they will probably not like the restrictor washers (which work by restricting air flow, and with CV carbs it is this airflow that moves the slide to adjust the mixture, rather than the slide just being connected directly to the throttle cable).

Some kind of throttle stop is probably required.

Note that the legal limit is 25kW "net power output". This is probably meant to be a crankshaft figure rather than a rear wheel figure.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[retrobiker]

cheers guys

throttle restrictor keeps coming up. plus a member on another forum has mentioned this as well

make a slightly longer inner cable so you cant fully open the throttle hence not open the carbs fully

wonder what insurance will make of this

thanks again

[el_oso]

as far as i know there is no 'correct' legal way to restrict the bike. throttle stop is probably the easiest way.
a friend at the bike club has a throttle stop for his r6 which has been declared to his insurance company
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Duke 390
Previous: '05 XR125L | '96 XJ600S Diversion |'05 Suzuki GSXR1000 | '05 Honda CBR125-R | '97 YZF 600R Thundercat | '11 Honda CBR250
Car: Jeep Wrangler 4.0L

[ThoughtContro...]

Choose your insurance company well. Some may be awkward and ask for a dyno printout or even worse insist on the mythical restriction certificate.

Others wont ask at all, until claims time at least.

H&R are paperwork lovers, Carole Nash certainly aren't in my limited experience.
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Prize cunt
--
"In a world of universal deceit telling the truth is a revolutionary act" - George Orwell

[Kickstart]

[0l0dom0l0]

I've used a cable crimp on mine to restrict it. Works well so you could do that.
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CBT Passed: 30/08/2009, Theory Passed: 31/08/2010, Mod 1 Passed: 6/9/2010, Mod 2 Passed: 13/09/2010. Restriction ended 13/09/2012.

Bikes: 2007 Derbi GPR 50, 1998 Yamaha Fazer 600 (written off), 2002 Yamaha Fazer 600, 1994 CBR 600F, 2003 Triumph Daytona 600, Kawasaki ZX6R J1.....Current: 2006 Yamaha FZ6, 1998 Suzuki TL1000R and a Honda VFR 400 NC30.