Remove nc31 restrictor kit

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gorgar
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Remove nc31 restrictor kit

Post by gorgar » Tue Jul 05, 2011 10:03 pm

Hi
I have a restricted cb400 sf nc31, i want to remove it. Do you have any ideas how to do this?

Superjack44
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Re: Remove nc31 restrictor kit

Post by Superjack44 » Wed Jul 06, 2011 10:12 am

Never seen it but understand they resemble large washers that are fitted between the carbs and the inlet mounting rubbers in which case you would have to remove the carbs in order to remove the washers .
1 Remove the petrol tank.
2 Slacken off the airbox you should be able to move it back slightly.
3 Slacken the inlet rubber clips that hold the carbs on and gently prise them out of position but be careful of where you place the lever, the carbs can be damaged by a carelessly placed lever, work the lever gently from different positions until they start to move once out the carbs can be manipulated away from the rear of the cylinder heads if you look inside the rubbers you should be able to see the restrictors and remove them.

amorti
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Re: Remove nc31 restrictor kit

Post by amorti » Wed Jul 06, 2011 12:17 pm

Superjack44 wrote:Never seen it but understand they resemble large washers that are fitted between the carbs and the inlet mounting rubbers in which case you would have to remove the carbs in order to remove the washers .
1 Remove the petrol tank.
2 Slacken off the airbox you should be able to move it back slightly.
3 Slacken the inlet rubber clips that hold the carbs on and gently prise them out of position but be careful of where you place the lever, the carbs can be damaged by a carelessly placed lever, work the lever gently from different positions until they start to move once out the carbs can be manipulated away from the rear of the cylinder heads if you look inside the rubbers you should be able to see the restrictors and remove them.
This is correct.

If you are a new rider in UK or Europe:
Remember if you are not yet entitled to remove them, you will be riding without a valid license, or insurance. If you are not entitled then it probably means you have had your full license less than 2 years. In this case, the points on your license for no insurance will already mean you are banned, then any for the no license riding will be additional. In the UK it's a minimum 6 points for no insurance (instant ban on new license) and a minimum £200 fine, plus your bike gets towed away. And then your insurance premium will be unbelievable for years after you finally get your license back. Think hard about it!

Superjack44
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Re: Remove nc31 restrictor kit

Post by Superjack44 » Wed Jul 06, 2011 2:24 pm

amorti wrote:
Superjack44 wrote:Never seen it but understand they resemble large washers that are fitted between the carbs and the inlet mounting rubbers in which case you would have to remove the carbs in order to remove the washers .
1 Remove the petrol tank.
2 Slacken off the airbox you should be able to move it back slightly.
3 Slacken the inlet rubber clips that hold the carbs on and gently prise them out of position but be careful of where you place the lever, the carbs can be damaged by a carelessly placed lever, work the lever gently from different positions until they start to move once out the carbs can be manipulated away from the rear of the cylinder heads if you look inside the rubbers you should be able to see the restrictors and remove them.
This is correct.

If you are a new rider in UK or Europe:
Remember if you are not yet entitled to remove them, you will be riding without a valid license, or insurance. If you are not entitled then it probably means you have had your full license less than 2 years. In this case, the points on your license for no insurance will already mean you are banned, then any for the no license riding will be additional. In the UK it's a minimum 6 points for no insurance (instant ban on new license) and a minimum £200 fine, plus your bike gets towed away. And then your insurance premium will be unbelievable for years after you finally get your license back. Think hard about it!
Never thought about whether you were just a new rider and I dont want you to get in trouble the above is sound advice bear it in mind before you do anything to make the bike illegal.
It may cost you a small fortune.

gorgar
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Re: Remove nc31 restrictor kit

Post by gorgar » Wed Jul 06, 2011 8:06 pm

I've got full licence for more than two years, so remove restrictor is legal. Thanks for advices.

Richh
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Re: Remove nc31 restrictor kit

Post by Richh » Tue May 07, 2013 9:16 pm

Hi everyone. Thought I'd post my question here rather than start a new topic.

I'm going to buy a set of restrictor washers to limit my 1995 CB400 SF 'Version R' to 33bhp, either from porndoguk on this forum or via kickstart_engineering on ebay, but not the 'official' FI International kit :)

I've seen a couple of posts on how to remove the carbs from a V4, and seen other forums with walkthroughs for fitting the restrictor washers into a CBR600 (different bike, I know, not sure how much more complex/different the actual setup is? - http://goo.gl/SJWNQ). And, also the info in the posts above...

1 Remove the petrol tank.
2 Slacken off the airbox you should be able to move it back slightly.
3 Slacken the inlet rubber clips that hold the carbs...

...etc. Sounds easy enough!?

But, I've read other posts saying getting the carbs off, and back on again, can be a real pain in the arse (unless the engine's warmed up, in which case the rubber where the washers go becomes more pliable?), and some posts saying playing with the carbs at all is not really 'newbie' territory.

I just want to know, how easy actually is it, and am I likely to come up against any major issues (other than my own incompetence) if I sit down to do it one evening, or even potentially damage the carbs? I've changed the chain and sprockets on my old 125 before but that's about it :)

So, give it a go myself, or spend £40 at the garage and get them to 'pop them in' (it sounds so easy!) for me?

Hints and tips appreciated :)

Thanks all,
Rich

superv500
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Re: Remove nc31 restrictor kit

Post by superv500 » Wed May 08, 2013 7:05 am

Popped mine off on Sunday, first time off on this bike so took a little while, I did:

Tank off
CDI unit off and out the way
Airbox loosened and slid back
Carb rubbers loosened and carbs wiggled off (this took about 15mins, you've got to persevere with carb removal)
Carbs now on bench being cleaned

As for it being restricted, for insurance purposes don't you need to have it fitted by someone authorised to get a bit of paper to say it's 33hp?

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CMSMJ1
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Re: Remove nc31 restrictor kit

Post by CMSMJ1 » Wed May 08, 2013 7:52 am

Get the washers from Pornodog..keep it in the greybike family! He is not making money out of this but has had a batch made for our benefit.

for fitting them - they sit in the inlets on the engine and so remove whatever you need to to pull the carbs off, put the washers in the inlets..and refit the carbs. Simple.

All the talk of new rubbers, difficult fitment etc - that is mainly the V4s..they can be total and utter bastards to get the carbs on if you do not have the knack.
IMPERATOR REX ANGLORUM

The V4 is the law..

NC30 - No9 - my old mate

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porndoguk
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Re: Remove nc31 restrictor kit

Post by porndoguk » Wed May 08, 2013 8:02 am

CMSMJ1 wrote:Get the washers from Pornodog..keep it in the greybike family! He is not making money out of this but has had a batch made for our benefit.

for fitting them - they sit in the inlets on the engine and so remove whatever you need to to pull the carbs off, put the washers in the inlets..and refit the carbs. Simple.

All the talk of new rubbers, difficult fitment etc - that is mainly the V4s..they can be total and utter bastards to get the carbs on if you do not have the knack.
And not only that i donate £5 from each sale to the site!

So after paypal fees, £5 donation, £5P&P theres nothing in it for me, infact i made a loss on the first batch.

Im terms of legality and paperwork, its down to you to KEEP the restrictors fitted,

For instance paying top dollar for a company to fit and issue you a piece of paper is no different to an MOT to which i ans others swap cans and numberplates over as soon as were are home.

If your stopped by the police it is then "Their" job to prove/test you bike is 33BHP chances are this would only ever be examinied in the case of a RTC for insurance purposes and who to point the finger at

But the bottom line is, as long as there in is doesnt matter who fitted them, or where you bought them as long as there in therr.

Rick
NC30 & NC23 33BHP Restrictors For Sale
£25 Inc P&P and donation to 400GB PM for more details


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Richh
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Re: Remove nc31 restrictor kit

Post by Richh » Wed May 08, 2013 8:20 am

That was my understanding too - that as long as the restrictors are fitted, you're safe. Most of the time there's no need for the certificates as they're not a legal document, and a lot of insurance companies don't ask for them anyway. There's a lot more info about it on this article on Motorcyle News - http://goo.gl/D76B1 - basically saying how FI International rip people off :)

The most interesting bit of the article says, in relation to the certificates...

• There is no legal requirement for riders to have a so-called 33bhp certificate.
• Insurers say categorically a claim will not be rejected because you don’t have one.
• Neither police nor insurers regard them as proof a motorcycle is restricted.
• There is no industry standard on what they look like or who can issue them.
• Examples can be bought on eBay for any bike for £18.

And there's a very good chance I could get through my remaining 17 months of restriction on my A2 licence without ever actually fitting anything, riding the CB400 at it's full power output, and never been found out. But, I'm a (reasonably) sensible 34 year old, and 33bhp will me more than enough for me on my commute for a long while anyway (I've lived with an 11bhp Suzuki for the last 3 years), so I might as well put the things in and play it safe!

Cheers for the tips folks.

@Rick, I've sent you a PM regarding the kit.

Ta,
Rich


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