honda vfr400r nc30

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

Hi.
I have honda vfr400r nc30.
I have the 180kp/h speedo on.when my speedo shows 100kph I am apparently
actually doing 132kph according to my brother in law when he rides next to me.
How can I fix this?

2nd.I have a top end of 230kph on the dyno.but on my speedo it never even reaches 180.
I know apparently there is a restrictor plate built into the speedo that can be bypassed.
I know it has not been done on mine.so if I do it will it give me even more top end?
Apparenty there is also a "black sector on the indicator needle shaft"
Where do I find this shaft.
Can anyone help?

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

Just another question.
How could I increase my acceleration?
It is quite sluggish at the moment on pull off.
I know its not my motor as I had it checked.
Its almost as though my clutch is sticking, but only on pull off.the rest of the gears
It runs smooth?

Please help

Richy CB1000 · Trackday Trickster Joined: 06 May 2012 Karma :

Don't know about your specific model, but my import has the clocks to 180km/h ( 112mph?)

This I believe is the restricted speed imposed on Japan's roads, including monsters like the Nissan GTR etc...

My bike ( Honda CB1000) has the clocks and therefore restrictor originally and would not go over 115mph.

Also there is a "limiter wire" or something connected up in the speedo, no one with the Big One's seems to sure about it.

However the solution that works on mine and others, fit a speed converter between the end of the speedo cable and the clock housing, these reduce via gearing inside the input speed of the cable into the speedo.

So when mine says I'm doing 60kmh on the clock it's really now 60mph so no need to cover over the numbers on the face etc...

This tricks the speedo as obviously I cant get to 180kmh on the clock (which would now be actually 180 mph) so the limiter does not come into force anymore allowing me have had a go upto 135mph after which I gave up as I couldn't hang on!

They're around £25 so worth a punt......

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

Thanks.I will look into it.
It makes sense that it is showing mph.
The max I get it to show on my clock is 160kph on a nice long stright road.
Wich there is a lot of on my way to work.
But I will have a look at a converter

Jim Mc · Nearly there... Joined: 28 Dec 2010 Karma :

If your stop speed is indicated @ 160 it wont be mph, it must be out a fair bit.

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

That's the problem.
How can I fix it.
Its a bit difficuilt when you go past a speed trap not to get caught

craigs23 · Mr Muscle Joined: 08 Jun 2005 Karma :

Couple of points I can think of:

- Is your brother's speedo accurate (as all speedos are inaccurate to a degree, albeit not to the amount you mention)?

- What gearing are you running on your bike? The speedo drive works from the front sprocket on an NC30, if the gearing's out, it will effect your speedo reading.

- Easiest way I found to bypass the 180kph restrictor is to fit a Motrax speedo convertor (or similar) - it makes the speedo read in mph rather than kph, so as the bike will never hit 180mph, the restrictor won't activate anymore.

MaybeGuy · Super Spammer Joined: 12 Mar 2007 Karma :

Isn't there a restriction in the clocks on an nc30? It's as simple as bending a metal tab out of the way. Fitting a mph conversion to it also fixes it.
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bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

My brother in law rides a suzuki tl1000s with a digital clock.so I am sure he's is rite.
The problem is my sppedo never reaches 180.
But I know for a fact my top end is round 240.I have tested that theory on the dyno machine and the track.using a radar.
So the limiter in the clock probably never kicks in as it only reaches 160kph on the clock.
But by then I'm doing about 240 actual speed

P.addy · *Formerly known as* P. Joined: 14 Feb 2008 Karma :

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

Actually I have a full yoshi system, big bore pistons, gas flowed head,different sprockets.
So trust me.its not just 160kph.
My only question "paddington" is will it make a difference if I benf the limitor plate back inside the speedo.
Or how to get my speedo to show the correct speed without changing the clock?

P.addy · *Formerly known as* P. Joined: 14 Feb 2008 Karma :

bike crazy · L Plate Warrior Joined: 17 May 2012 Karma :

Thank you.
That's what I needed to know

shereen · World Chat Champion Joined: 15 Mar 2011 Karma :

P.addy · *Formerly known as* P. Joined: 14 Feb 2008 Karma :

map · Mr Calendar Joined: 14 Jun 2004 Karma :

Getting back to basics and as said above I wouldn't depend on anyone else's speedo either. Best bet would be to try a sat-nav system and get the speed reading from that. Several million dollars of US military hardware versus a few pounds on a cable and gear system - you know it makes sense Very Happy

Failing that you could try another digital speedo system. I think there are those similar to found on push-bikes that you can use if correctly calibrated (magnet on wheel with pick-up on forks).

HTH Thumbs Up

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Richy CB1000 · Trackday Trickster Joined: 06 May 2012 Karma :

Seems like you have a couple of issues,

1 A speed converter is needed to remove the top end restriction

2 As said by others above, check the sprocket as it reads of the front one so if it's not standard it will be displaying the wrong speed