Easy way to fix speedo with GSXR front

[northwind]

Here's the simplest and quickest way I know of to make this work. Not the cheapest, probably not the neatest but you can stealth it to your heart's content as the speedo pickup is so titchy. I knew this would work but I only actually did it tonight so I've not posted it before, Stu has the exact same setup on his.

You need just 2 things, or possibly one if you're prepared to do a certain amount of messing about in the fitment stage.

1) Wiring loom for a Veypor datalogger (which also comes with cable ties, superglue, and some magnets. £41.57 delivered within the UK.
http://www.veypor.co.uk/xcart/produc...roductid=16143

2) For ease of fitment, some stronger magnets- I used these beasts:
http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWN:IT&ih=003

They're strong enough that the sensor works at over an inch away, which means that i don't need a bracket- the sensor can be simply attached to the swingarm and the magnets to the rear disc. You could fit it elsewhere- rear sprocket, front disc, wheel rims... But rear disc is very simple and quick, so I've put it there for now. The Veypor ones do work but the sensor has to be just right, and very close- frankly I can't be bothered with that.

Step 1- the veypor harness has loads of extra stuff on it, sadly we're paying money for this and we don't need it. Chop off the speedo sensor from the harness. This is a great wee sensor, it's tiny- about 8mm by 15mm by 4mm at its largest points. It's also now well waterproofed- the old one wasn't, and mine broke, but the new one has been adapted and sealed.

Step 2- Cut the plug off the old speedo sensor.

Step 3- after adjusting length, wire the Veypor sensor to the SV speedo wiring. These follow this wiring scheme for the carbed SV:

Veypor uninsulated wire to SV black and white wire (earth)
Veypor black wire to SV pink wire (+5/6V)
Veypor red wire to SV orange and red wire. (+12V)

If you mess this up, you will melt the sensor and possibly damage your clocks. So don't. The pointy may be the same (ask Stu!) but the easiest thing to do is to check the outputs from the clocks with a voltmeter.

Step 4- fit magnets to something suitable, such as the rear disc, wheel etc. You want this fairly close to equally spaced but don't worry if they're a little off, for instance I have the 4 magnets on the rear disc, which has 5 "arms"- so they're a bit off equal. It works fine. You need to get all the polarities the same, and a bit of glue is not a bad idea.

Step 5- attach sensor near to magnets and test. Mine is attached right to the swingarm, and the gap between it and the magnets is about an inch, with these magnets it works perfectly. Less powerful magnets will need more fine tuning though.

Step 6- there is no step 6. Oh, OK, you can tidy up the wires if you like. I haven't, it looks more or less like the electrical section in B&Q just now

And, well, that's it. If you're thinking this could be done cheaper, yes it could, with the Veypor sensor you're paying extra for stuff you don't need. I've asked Nathan at Veypor nicely if he can tell us where he gets his from, but I've never seen them for sale. If you're thinking it could be done more stylishly, with magnets fitted into brake disc rotors etc, that's also true- but to be honest I think that just overcomplicates things.

No pics- in all honesty there's no point, once it's fitted right only the magnets will be visible and they'll be well tucked away. The sensor is hidden on the inside of the swingarm so it's invisible unless you're really looking. You could go for a real stealth install if you want but I'm not sure it's needed.

Job jobbed...

bookmarked!!!

[northwind]

Oh yeah, I've got loads of magnets left, I bought 3 lots of different sizes so if anyone needs any, give us a shout. Currently they're just sticking all my tools to all my other tools (I couldn't find a 14mm spanner earlier- it was stuck to the roof of the toolbox)

Nice idea, but two things strike me ... the second more important than the first ...

Firstly I assume the stock one is magnetically triggered, so why not just chop up the stock speedo pickup and do the same thing and save yourself ?40? ... and I thought you were a Scotsman!?!? Hang your head in shame at missing that trick!!

But secondly and more importantly, you have assumed the front and rear wheels rotate at the same rate?!? ... Well that is not so, the rolling circumference of the front and rear wheels are significantly different, this will screw your indicated speed right up ...

Quickly measuring a couple of tyres I had knocking about, the front was 181cm the rear 198cm .. so that is ~10% your speedo will be under-reading ... not a happy situation for your licence or bragging rights!!













Before anyone says it ... sure speedos tend to over read as stock (tend to, they don't always have to, its just manufacturing errors!!)

Stock speedo on the rear wheel is more accurate than when it is on the front I think.

[northwind]

(There's no way I can do this response without looking like a smartarse, so I'm not even going to try )

You can do the rear wheel speedo mod only on the curvy SV (as the pointy has different sized axles), and it's harder if not impossible to do with other wheels, so it's limited. I did it myself (in fact, as far as I know I was the first person to make it reliable using the wheel castellation method, Zook 5-0 was the first person I know of to do it at all but he never made it work right) This works for both bikes, and it's easier to do- the rear wheel speedo needs you to grind the drive, caliper hanger and rotor down so it's time consuming, and it complicates wheel changes. It also leaves the fragile rotor in the equation, mine finally packed in so rather than spend money on another (£15) I thought I'd remove it entirely for a simpler solution.

It's a good mod though, that rear wheel trick this is just simpler, you don't even need to remove the wheel.

(here is the thread I wrote about it 3 years ago:
http://forums.sv650.org/showthread.p...edo+rear+wheel)

This mod's "competition", if you will, is the assorted methods such as Jim or Newt's speedo kits, or finding your own from Farnell or similiar- the prices work out about eqivalent but this is a much smaller sensor than any other I've seen, so I like it for that reason.

You mean cm by the way, not mm, unless you were looking at minimoto tyres

The wheel circimference error isn't really an issue, it's exactly the same as if you do it with the stock sensor of course- if it concerns you there's no reason not to put it on the front of course, if you want to keep the stock error, but I checked mine against a Veypor and it came out almost accurate (it still underreads fractionally at 40mph) Bragging rights aren't an issue, and why would they be on a girly commuter?

As for overlooking it:
http://forums.sv650.org/showthread.p...ght=revelation

This one's just from 2006 though

Interesting.

Originally Posted by northwind

..

Ok, so it wasn't an oversight, how dare I think that Mr Northy could have made such a schoolboy error!!

As for fitting the complete stock sensor to the rear, that is not what I meant (interesting idea though) . I meant dismantling it and taking out the trigger mechanism/pickup and then placing this in an appropriate place like you have your after market pickup ... if you are assuming there is an ~10% over-read in your speedo, then indeed the rear is a good move. If you want to play it safe then the front!!!

[northwind]

Hmm, interesting thought that. It's a sealed unit but there might well be something in there that would work. Never thought of that, not sure if anyone else has either for that matter. Anyone got a broken one to play with?

Originally Posted by northwind

Oh yeah, I've got loads of magnets left, I bought 3 lots of different sizes so if anyone needs any, give us a shout. Currently they're just sticking all my tools to all my other tools (I couldn't find a 14mm spanner earlier- it was stuck to the roof of the toolbox)

I think I may need a few Northy!

Rich