GPZ500 and 33BHP Restriction

[veeeffarr]

Hi guys,

As I am too tightarsed (poor) to do my DAS, looks like I'll be doing my A2 License (Few hours lessons, then test).

Just wondering how a GPZ500S will hold up to restriction, how it is restricted, how easy kits are to obtain (buggered if I'm paying £150 for washers).

Will I have to take it to a dyno afterwards?

Cheers,

Toby

[instigator]

Nah won't need dyno'd

Restricted via washers near carbs

£140 for the F.I kit to be delivered to a garage next day delivery. Then fitting is anything they charge you.

Gpz's seem to be commonly restricted. Your best bet is to find bikes that are already restricted and contact the people that own them to see if they are still 'using' them. It's easy to take them out or put them in, say you'd give them £30 for them (emphasis on the fact that from a warranty point of view, these discs are now completely useless in any other bike and if they are tampered with)

So, now that they know they are worthless, say you'd take them off their hands for £30 if not less. Join VD and ask on their :wanted: bike parts section, they have a wider audience.

[veeeffarr]

Ta,

Might not bother all together They'll probably fall out as soon as I put them in, I'm crap at mechanics.

[bish777]

Maybe a big single like a Vigor 650 etc may be a better option?? big singles dont suffer like multis when restricted.
____________________
GSXR1100J

[hedjehog]

Yes, I've seen a couple of GPZs on eBay that are already restricted. Don't know what side-effects it has other than the power restriction itself though.

hedjehog
____________________
1988 CG125 BRE; 2000 GPZ500S D7; VFR 800 FI-X; 1980 CB 250 RSA; 1998 FZS 600 Fazer; 1986 Honda C70 E

[biker-dj]

Here hopefully is a link that Instigator posted to me when I was consering taking out my washers on the GPZ. The photo breakdown is actually for an ER 5 I think but I think its the same for the GPZ. Also you could do a search for an earlier post by me under the heading De- restricting my GPZ. some info as well. Here is the link.Hope it works. https://clubs.wanadoo.co.uk/vault/kawasakier5/RestrictionDe-restriction.doc
____________________
Ride with the music!

[veeeffarr]

Thanks for that!

Never heard of the Vigor 650! Good bike? How much they usually go for? Is there a honda model code (CBR, CG, etc)?

Thanks

(Code is FX650 for those interested and makes 39 BHP)

[biker-dj]

[biker-dj]

[veeeffarr]

Hi,

I haven't yet.

Booking my test in a few weeks though.

[iCraig]

To be honest GPZ's don't take to well to restriction as well as the other 500's though there OK.

You will loose the powerband of the GPZ which is usually at 7krpm and it will feel totally flat but it will still be rideable I spose.

Your best bet IMO, is get a GS500 or an ER-5 both are much better suited to 33bhp.

[Harold_Shand]

I did the A2 and bought a bike that was under 33bhp.

Makes sense to me...
____________________
BCF's 6th favourite poster 2009-2010

Harold_Shand's theory might be the best explanation.

[mrchips]

I was riding a restricted GPZ for a while. It's OK but smoothens off the power delivery.
____________________
Northern Irish? www.nibikers.com

[Simple]

[Simple]

[Simple]

[Andy C]

dont restrict it, i havnt and if i had they would have been out within a week, just my opinion but really didnt see the point yes its the law and insurance void if big accident but still
____________________
99 RS125 --> 02 SV650s --> 03 Speed Four --> 92 RXS100 --> 93 CB400sf --> 01 CB600f Hornet

[Simple]

[iCraig]

[Simple]

[quote="Craig]

Oh and my GPZ used to flie up to approx 125mph when it was at its hayday before the topend commited suicide. [/quote]

Ahh, nice.

Never rode my GPZ unrestricted so don't know what I'm missing. Made the most sense.

Just changed oil, and noticed some erm...possibly worrying noises/symptoms...


simple
____________________
Insta - FemFeral

[nick.h]

Resticting my gs500 was easy,

1. Firstly appeal for somebody to give you the restricters (I got some carb sliders for free, but they were for the later model).

2. If the top option doesnt work, contact somebody that has the kit, and ask politely for them to measure the dimensions of the washers, or find this information out online.

3. With dimensions go to local hardware store and find a suitable match, this will cost approx. 15p

4. Insert washers between carbs, then book a dyno approx. £30

Had my bike dynoed at 27.01BHP, i dont get the full restricted power im allowed, but i saved over a ton, and who says there staying in

Nick
____________________
[Italjet MM5A] ll [Rieju RS1 Evolution] ll [Suzuki GS500e] ll [Suzuki GSX600F] ll [Honda CG125] ll [Pug Elyseo 125] ll [Yamaha YZF750R] ll [Yamaha Thunderace] ll [Yamaha R6] ll [Triumph 955i] ll [Hayabusa RZK3] ll [Suzuki RGV250] ll

[Kickstart]

Hi

To be honest given the cost of restricting a bike with an official kit it might be cheaper to to DAS.

Charlottes GPZ500 was dynoed at 45hp. They do not need to loose that much power.

All the best

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

[Irezumi aka Reuben]

Fit a throttle stop (as Davo mentioned in another thread). Then take it to a dyno and get them to set it up for 33bhp. Make it adjustable so it can be messed around with at the dyno place.
____________________
Pictorgraphicalfantastical

[bish777]

[iCraig]