1995 FZR600R 33BHP Restriction

[MattJ]

Bought a '95 FZR600R a couple of weeks ago ready to ride in February where my insurance runs out on my CG. I'm really struggling to find some restrictors for it on eBay and being a poor student I really don't want to pay dealer prices. So I've been looking around for the dimensions of the washers to see if I could get some made up for me, but so far I've had no joy.

So it's looking like using a throttle stop and getting it dyno'd is the best idea, but how would I go about this? I don't know how I would go about fitting one. I would go on the FZR forum but it seems to be American with a very small amount of UK members. Anybody got some knowledge they could share?

Cheers.

[andys675]

the FZR600R never made its way to the US and shares more in common with the thundercat than the old FZR600, look for some restrictors for a thundercat?

[Kickstart]

Hi

Thundercat is very similar to the FZR600R as mentioned above. There are minor engine changes.

Quick Ebay search found these.

While I wouldn't be 100% sure that it comes out at 33hp, it should be very close

All the best

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

[MattJ]

Yeah I've seen them, and I've read how close the engine is to the Thundercat, but I haven't seen any proof. I'm wondering about buying those restrictors on ebay anyway and just seeing if they fit. The Thundercat seems to produce about the same power as the FZR and like I said, I've read that the engine is very similar, but I don't want to waste my money. What do you think I should do?

As for it never making its way to the US, I've seen in numerous places (including Haynes Manual) that it was manufactured in the US from 89-96, just as it was in the UK.

[molex]

Restrict power can be very simple, it can be cheap!!

Burning it need oxygen (air) and (gas).!

So (air) :
1. restrict the "air box" air intake (use tape seal it half or more).

2. add long the air intake "air funnel" (delate the air into the air box).

3. seal the air filter (use tape seal the air filter half or more).

Then test it one by one.


Of course some other "cheap way" (gas).

Add the preload at carburetor (cover, diaphragm).
Restrict the (Valve, Piston) go high (less gas, less power)



At last hope it can help you. Good luck.!

[Ariel Badger]

They may be cheap but can damage an engine, You need to keep the mixture consistent but restricted and washers will do this as will limiting throttle opening.
By just limiting either air or fuel you will at the best soot up a motor at worst burn out the pistons.
____________________
Bikers make great organ donors, get 115 on your licence today.

[P.]

You can just use the Thundercat ones.

Even if it was slightly over, your bike will have lost a few ponies by now.

Is your bike absolutely standard. Flatmate has a 1992 GSXR750, gets big headed as it has a dyno print showing 126hp. Had his 33hp washers installed, still dynos around 36, thats from FI. Its down to the K&N, full D&D system and rejet.

My bikes were never 33hp... only had the restriction for a year anyway as was running around on a 125. But I had an accident when I was on my restriction and they didn't check then. I rode without them after regardless. Just don't be a dick, don't crash and don't do wheelies and they have minimal reason to pull you over.

[Kickstart]

[molex]

Some information from japan

Honda original restriction on VFR800 in japan

https://zensan.jp/index.html

After translate :

Please read the (flash) item.

https://66.163.168.225/babelfish/translate_url_content?.intl=us&lp=ja_en&trurl=http%3a%2f%2fzensan.jp%2findex.html#

[Kickstart]

Hi

That is a specific model and fuel injected.

With a carbed engine if you restrict the air flow before the carb you will likely land up with a large intake vacuum drawing a lot of fuel from the carbs. Probably run very rich and badly, in much the same way it would if the air filter was very dirty.

If you try and stop the slide on a CV carb lifting then you will restrict the fuel more than the air. As such as high throttle / revs you strand a fair chance of running lean, which could easily hole a piston.

The washers after the carbs restrict the airflow, but being after the carbs they work in the same way as not opening the throttle fully. The carb will do its job normally and the mixture should be OK.

All the best

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

[Im-a-Ridah]

You do know most people don't bother, that it's quite a ballache for the police to prove, and that there are many avenues to evade prosecution... right? So unless you have your heart set on restricting it, I wouldn't bother personally. The FI certificates have no legal status. Proving the bike is not restricted requires a dyno, and you can defer the inspection until surprise surprise you have a restrictor kit! But it's your choice ultimately!

[molex]

Please download this two document how to make it fast.!!

Carb FZR600
https://www.dynojet.com/pdf/4129HA.pdf
fig.B and C

Carb Ninja 250R
https://www.dynojet.com/pdf/2193.pdf
fig.C

[Kickstart]

Hi

Those are not restricting or derestricting the bike. They are kits to adjust the fueling, normally to improve it. The gains are fairly small.

If you restricted the bike by stopping the slide from lifting you would need to develop a similar type of kit to the Dynojet one (but with different profile needles and main jet) for the fueling to be OK. The Dynojet kit itself would be pretty useless for this.

For someone in the UK on a restricted licence they need the bike to produce under 25kW (about 33hp) at the crank for it to be legal for them to ride. That is a very large amount of power to lose given that an early FZR is going to be over 80hp at the back wheel (if in good condition) with an FZR600R being probably 10hp up on that.

All the best

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

[0l0dom0l0]

Buy the thundercat restrictors.

Fit them. Thunder cat uses 42mm carbs, hope the FZR has the same.

Then not worry about the rest. If you're really bothered get the bike dynoed and see what it comes out as and use this as proof the bike is restricted if stopped.

Washers make the bike run like shit regardless. They send the fuelling all over the place.
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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.

[MattJ]

A friend lost his license a couple of weeks ago, riding an early nineties CBR600, when the police stopped him he wasn't doing anything illegal. He never had the restrictors put in, so as much as a ball-ache it is, I'm getting it done.

Think I might go for those Thundercat ones. Do I just pop them in and that's it? When riding, would I be right in saying its a good idea not to try and rev the bike more than the restrictors allow? I imagine that wouldn't do the engine any good.

*Waits for Chives to chirp in that he'd rather chop his dick off than ride at 33bhp for the billionth time.*

Heard plenty of times that washers make the bike run crap, so another reason why I'm thinking about just using a throttle stop.

Oh and it's not completely standard, it has an aftermarket exhaust on but as far as I'm aware its not performance enhancing. It's 16 years old so it will have lost a few ponies too.

Thanks for your replies.




EDIT: Keith, I did try and contact that bloke on ebay, asking pretty much what you've said but he never replied.

[molex]

Please download this two document read (kit. D)

https://www.fiinternational.com/FiResKitA42.pdf

[P.]

You ride it as per normal.

Forget they are in there... just ride and forget about it

[Kickstart]

[Teflon-Mike]

[Kickstart]

[MattJ]

Thanks for the very helpful replies. Shows how little I know about anything really.

I sent him an email a few weeks ago Keith, I think only a couple of days after I bought the bike which was the very beginning of December, but because I've not been in a rush I haven't sent another message yet. Thanks for messaging him on the Bandit forum.

[molex]

Mr. Teflon-Mike
“Misleading, information” are come from UK this company.
If you have any question please inform them how to operate thank you very much.

https://www.fiinternational.com/

https://www.fiinternational.com/contact.asp



Some more information form japan ( Bandit GSF250 )

https://www1.synapse.ne.jp/s-hara/bandit/index.html

After translate :
https://translate.google.com/translate?sl=ja&tl=en&js=n&prev=_t&hl=zh-TW&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww1.synapse.ne.jp%2Fs-hara%2Fbandit%2Findex.html


Some main point :
Second role of the air Cleaner
https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www1.synapse.ne.jp/s-hara/bandit/cab-seca.html&usg=ALkJrhhtHaVaMRYB9TjV2_NO6yTwUem1NQ

https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www1.synapse.ne.jp/s-hara/bandit/cab-pist.html&usg=ALkJrhh2_b-MjVOt_Iw3pIyWO5LWesKDLw

Ref to Kit. D
https://www.fiinternational.com/FiResKitA42.pdf
less gas less power


Air filter :
The difference between early and late model
https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www1.synapse.ne.jp/s-hara/bandit/elm-chg.html&usg=ALkJrhjuVrlr1QrlEdeAPnyV-M-bJIfp_Q
delay the air flow


Rejet :
https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www1.synapse.ne.jp/s-hara/bandit/cab-ndjet.html&usg=ALkJrhjLERIV0yLXYXra8MMYOMWVP3uWCw

https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www1.synapse.ne.jp/s-hara/bandit/cab-pjt.html&usg=ALkJrhjEqW8EAYK_fp7KQPqky4Fh_B5AhQ

https://translate.googleusercontent.com/translate_c?hl=zh-TW&ie=UTF8&prev=_t&rurl=translate.google.com&sl=ja&tl=en&u=https://www.bands.ne.jp/faq/faq-us-pr250.html&usg=ALkJrhjPITMBRV52mWby-gnBgQcxScO10g
read the “jet needle” “Ring needle” “jet pilot”
So you can rejet to small size to reduce the power



At last restrict the throttle very cheap and simple too.!
Insert the “tube” in “throttle cable wire” between at carburetor,
Resultant the wire movement.
What tube?
Use your brain please!.

[Teflon-Mike]

[Kickstart]

Hi

Not sure what a Japanese market 250 Bandit has to do with things, but if you read those you will see how the CV carbs work. The slide rises with the air flow (pressure of the air in the carb compared to atmospheric pressure moves the slide), and this lifts the needle. The slide shouldn't be limiting the air flow, that is the job of the throttle. So if you limit the amount the slide can lift you limit the needle, hence it cannot supply the fuel required when full throttle is being used.

When setting up carbs quite a few things can be changed, and Dynojet type kits do supply the bits to do this for an engine in a reasonable level of tune. With these kits the needle might change, the spring above the slide might change and the air hole into the slide might change. The needle directly changes the mixture, the spring controls how far the slide moves for a certain difference in pressures while the hole in the slide controls how quickly the slide moves. Dynojet spend quite a bit of time and effort on each individual model of bike experimenting to find out what works. Just bodging up one of these areas (such as just limiting the slides movement) is unlikely to work well and can easily result in the engine running dangerously lean in certain situations.

As to FI kits, virtually none of there kits do work by limiting the movement of the slide and entirely possible that of the few that do they also supply a different needle for some of them. Either way I would be pretty certain that they have done testing on that particular model on a dyno to check that not only is it producing 25kW but that the mixture is safe.

All the best

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

[Noxious89123]

FI International restrictors for my bike were a set of washers and some short sections of plastic tube to sit ontop of the diaphragms to stop them lifting all the way. No change of needle.

But still, I think molex is talking shit. It's just not as simple as slapping something together.
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'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi