Electronic Speedo's

[philward]

I'm just about to look at the double disc conversion mods for my road based cr750 build and as I'm using the proper cr750 dash (and not the standard speedo/tacho) - but will obviously need speedo. Has anybody any experience on these setup and basically tell me how they work. Any specific experience on the 750? If I go the electronic route, I can adapt the twin disc without adapting/changing the speedo drive
Thanks
Phil

[royhall]

There are basically two types of electronic speedo, one that has a sensor to measure wheel speed, the other a GPS unit. The GPS type are easier and neater to fit as they dont need the sensor and cables, just a power supply. Unfortunately they tend to be dearer. Try this site for some ideas:  http://www.digital-speedos.co.uk/

[philward]

Thanks Roy - had a quick look and will probably go for a GPS version
Phil

[gtmdriver]

I'm not sure about the legality of a GPS based speedo in the UK.

They certainly aren't allowed in the IVA test for cars as they don't work when you're in a tunnel and such like.

I doubt if the average MOT tester will pick it up but you never know.

As regards the sensor type you just need you mount the sensor somewhere where it can detect a rotating part. I've got one on my car and it detects the 6 bolts on the drive shaft flange.

Programming is easy. All the speedo needs to know is how many pulses it will get from the sensor per wheel revolution and how far the vehicle travels during 1 complete wheel revolution.

[Rob.b (Rob Birkett - RIP)]

Phil,

You probably already know this, but just in case you don't there are free GPS speedo apps for your phone.  Mine even has a trip computer included and is very customise-able 

Rob

[philward]

Thanks guys - I'm a way off fitting it yet - just needed to know practicalities so I can set to on the double disc conversion - it was the speedo drive that was my main concern so now I know there are practical options, I can do the conversion accordingly. The cr750 will not use the standardised speedo so losing the drive will help. After your comments, will probably go for a sensor based one.
Thanks for your help

Sent from my MotoG3 using Tapatalk

[MarkCR750]

I have used a bicycle speedo on mine Phil, it means that you can have just a rev counter and oil pressure gauge on the dash, I've mounted the speedo on the centre support for the fairing in front of the yoke so it's tucked away but easy to see when riding, it's accurate and reads up to 125mph (not sure why the manufacturer thought a cyclist would be doing 125mph 😄) I've glued the magnet for the sensor to one of the disc bolts and the pick up on the wheel side of the slider so once again it's tucked away and hard to see, the speedo is not part of the MOT so no problem s there, I leave mine on the clock function so I know what time it is as well, plus you have trip/odo/ etc, even altitude 😄,  cheap as chips as well.
PS if you did go this way make sure it has auto start, it switches itself on as soon as the wheel rotates, and off after the bike has been stationery for 5 minutes.

[philward]

Thanks Mark, I'll be in touch when I'm at that stage - I'm just refubing the 2nd caliper/disc set up, making footrest mounts (help from Scott CR21 - thanks) and about to order the Simon Tappin Moonpie exhaust - so some months off finishing and am aiming for spring 2018.
Phil

[MarkCR750]

Thanks Mark, I'll be in touch when I'm at that stage - I'm just refubing the 2nd caliper/disc set up, making footrest mounts (help from Scott CR21 - thanks) and about to order the Simon Tappin Moonpie exhaust - so some months off finishing and am aiming for spring 2018.
Phil

It's moving ahead then Phil, I've got a brand new David silver gold Wing reproduction master cylinder suitable for twin disc set up if you need one.

[Zunspec]

Hello Phil,

Only a minor point as you have a way ahead, but, speedo's are not actually checked as part of the MOT. 

Cheers  Geoff

[philward]

Thanks Mark - I think I have one (I'm sure I bought one SH last year) - will check over weekend and let you know
Thanks again