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Discussion Starter #1
Hi all, I am a proud owner of a 2003 honda 954rr. Need help on a couple of issues.
The chassis no. of my bike is SC50-1000xxx, is it alright or supposed to be a 17 digit no./alphabet.
Also there is a speed limiter at 180kph.
Will somebody be kind enough to help me out on these two issues, especially the latter.
 

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Hi all, I am a proud owner of a 2003 honda 954rr. Need help on a couple of issues.
The chassis no. of my bike is SC50-1000xxx, is it alright or supposed to be a 17 digit no./alphabet.
Also there is a speed limiter at 180kph.
Will somebody be kind enough to help me out on these two issues, especially the latter.
The VIN should be 17 digits - JH2SC50XXXXXXXXXX. JH2 is the manufacturer code I think. SC50 is the model, then there should be a letter indicating the market it was built for (A=Europe, B=Germany, C=France, U=Australia). Then a check digit for confirming the VIN is genuine (using a rather complex formula). Then a year indicator (954 will be 2 or 3). Then an M I think and finally a six-digit serial number.
The speed limiter is for Japanese models I thought or French perhaps?
No idea how to rectify it but I'd expect you'd need to replace the ECU at least.
 

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Discussion Starter #3
thanks bladeracer for the reply, i thought so too on the VIN. though i really need a solution to the limiter problem. BTW how much would a ecu cost me.
 

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thanks bladeracer for the reply, i thought so too on the VIN. though i really need a solution to the limiter problem. BTW how much would a ecu cost me.
First you'd need to determine if it has the same connectors as yours so as to be able to use it.
Does the bike have the HISS immobiliser? Does it have an O2 sensor in the midpipe?
Is it an SC50C?
If you can use a US ECU you should be able to pick one up pretty cheaply I would think.
Does the speed limiter still work if you remove the dash? Just in case the limiter is built into the speedo. 180kph in top gear is only around 7000RPM?
 

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Discussion Starter #5
First you'd need to determine if it has the same connectors as yours so as to be able to use it.
Does the bike have the HISS immobiliser? Does it have an O2 sensor in the midpipe?
Is it an SC50C?
If you can use a US ECU you should be able to pick one up pretty cheaply I would think.
Does the speed limiter still work if you remove the dash? Just in case the limiter is built into the speedo. 180kph in top gear is only around 7000RPM?
yes, it has HISS immobiliser.
02 sensor, how do I find it?
engine no. is SC50E, ch. no. SC501000xxx
no the speed limiter does not work, but rev limiter kicks in @7300rpm, which is also when the bike reaches 180 in the 6th gear. Checked it out by removing the connection to the speedo.
 

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yes, it has HISS immobiliser.
02 sensor, how do I find it?
engine no. is SC50E, ch. no. SC501000xxx
no the speed limiter does not work, but rev limiter kicks in @7300rpm, which is also when the bike reaches 180 in the 6th gear. Checked it out by removing the connection to the speedo.
HISS is going to be a problem as you'll need a replacement ECU complete with its matching keys.
The engine number doesn't matter as all the engines are the same. You need the VIN code to determine which model it is.
The rev limiter must be different in each gear surely? Does it rev above 7300RPM in the lower gears?
 

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Discussion Starter #7
HISS is going to be a problem as you'll need a replacement ECU complete with its matching keys.
The engine number doesn't matter as all the engines are the same. You need the VIN code to determine which model it is.
The rev limiter must be different in each gear surely? Does it rev above 7300RPM in the lower gears?
there is speed limiter @180kph regardless of the gear, or the rpm.
rev limter @7300rpm only kicked in when the speedo was disconnected, again regardless of the gear.
 

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there is speed limiter @180kph regardless of the gear, or the rpm.
rev limiter @7300rpm only kicked in when the speedo was disconnected, again regardless of the gear.
Yes, that's what I thought. So the revs stop at different points with first and second gears revving right out to redline?
That sounds like a trick to prevent you from circumventing it by disconnecting the speedo.
Which leads me to believe it is hard-wired into the ECU.
 

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Discussion Starter #9
Yes, that's what I thought. So the revs stop at different points with first and second gears revving right out to redline?
That sounds like a trick to prevent you from circumventing it by disconnecting the speedo.
Which leads me to believe it is hard-wired into the ECU.
so any solution, other than replacing the ecu.
if not, where can i get an ecu from?
 

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As you have the HISS system your going to need to get a HISS ECU AND the corresponding HISS chip within the key.

It's possible to lift the shiny part of the key up and replace the chip (be very careful when you do it) and therefore saving you money. If not, your going to need the keys and full lock set.

Best place to look is eBay - second hand units (with the keys/lockset) are going for about £500 or there abouts but they're not always on there.

That is of course as long as the limiter is within the ECU (I would assume so as Blade seems to think it is :D)
 

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There's no solution I know of other than replacing the ECU and Ebay would be the place to get it.
First you would want to confirm that the connectors are compatible. A wiring diagram would show if any of the wiring is different but as long as the connectors fit the ECU you can alter the wiring to suit.
 

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Discussion Starter #12
after the speedo is disconnected (with a switch installed), the speed limiter is removed temporarily, but after one attempt(or after some time, not sure) rev limiter kicks in. then i have to turn the bike off and start again to remove the limiter.:confused:
I took the bike to 11000rpm in 3rd gear and 10000rpm in 4th gear.
 

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after the speedo is disconnected (with a switch installed), the speed limiter is removed temporarily, but after one attempt(or after some time, not sure) rev limiter kicks in. then i have to turn the bike off and start again to remove the limiter.:confused:
I took the bike to 11000rpm in 3rd gear and 10000rpm in 4th gear.
Do you mean that it wouldn't rev any higher in third and fourth?
At those revs in those gears you should be up over 200kph - with stock gearing at least.
 

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Discussion Starter #14
Do you mean that it wouldn't rev any higher in third and fourth?
At those revs in those gears you should be up over 200kph - with stock gearing at least.
I ran out of clear road and i think guts too.
It felt like +200kph to me.
 

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Couldn't he put in a NON HISS ECU and not worry about the key matching?
 

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Couldn't he put in a NON HISS ECU and not worry about the key matching?
Yep, but he'd also need the complete wiring harness, ignition switch and possibly the instrument cluster.
 

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what would the speed of 954 be @10000rpm in 4th gear, and @11000rpm in 3rd gear?
With stock 16/42 sprockets it'd be around 210kph - definately over 180kph.
 

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Discussion Starter #19
I will keep trying to remove the limiter permanently without replacing the ecu due to it's cost. If you find a way, do tell me. It did feel amazing at those speeds, although a bit dangerous on our roads.
thanks for your support bladeracer
 

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I will keep trying to remove the limiter permanently without replacing the ecu due to it's cost. If you find a way, do tell me. It did feel amazing at those speeds, although a bit dangerous on our roads.
thanks for your support bladeracer
You could try removing the tachometer and run an aftermarket one but I would think the ECU takes the RPM long before it makes it to the tach. If you could break into the tach circuit and alter it with a resistor or something like that it might work.
Personally, I'd get a complete harness from the US with ECU, ignition switch and instrument cluster. That way you get rid of the speed limiter and the HISS.
 
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