Just a quick one, can anyone tell me what the speedo drive ratio is for guzzi speedos, and what other bikes share the same ratio? I'm looking to replace my dash with something smaller, so need to find a speedo from another bike with the same ratio.
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Speedo drive ratio - Le Mans 1000
- Thread starter figaro
- Start date
figaro said:
Any of the 850 or 1000 Guzzis use the same ratio. The ratio changed with the 1100s.
I know that much, but I want to use a speedo from a completely different bike, say a Honda or Yamaha, so I need to match the speedo drive ratios. The Guzzi speedos are absolutely useless at their primary function of telling you how fast you're going... :dry:
Why didn't you say so in your original post. We can't read minds.figaro said:
Sorry, I'll try to make myself clearer in future. I want to change the whole dash console, the stock one looks hideous to me and the speedo over-reads wildly - I've seen 160mph on the clock just cruising down the motorway...
But due to lack of funds I'm having to look at secondhand instruments, and I'm trying to find out what other bikes have the same speedo drive ratio as the guzzi. I've seen a set of clocks from a Suzuki GS500E that would be perfect, but if the Suzuki's drive ratio is different there'd be no point me buying them.
But due to lack of funds I'm having to look at secondhand instruments, and I'm trying to find out what other bikes have the same speedo drive ratio as the guzzi. I've seen a set of clocks from a Suzuki GS500E that would be perfect, but if the Suzuki's drive ratio is different there'd be no point me buying them.
I know for a fact that the std 750/850/1000 Vague Liar speedo has a ratio of 1 revolution per metre.
I f you have a talented instrument place and they have enough spares they can change the internal ratios of the speedo to suit the drive.
I had this done with smiths speedo on Norton ,it was changed to suit a speedo drive on the Yamaha front wheel I was using.
What about using an electronic speedo/tach/dash panel such as an Acewell.?Nice and compact,no cables to worry about.They have a number of different models to choose from.
Save yourself a lot of headaches trying to find the speedo to match the drive on the Guzzi.
Brett
I f you have a talented instrument place and they have enough spares they can change the internal ratios of the speedo to suit the drive.
I had this done with smiths speedo on Norton ,it was changed to suit a speedo drive on the Yamaha front wheel I was using.
What about using an electronic speedo/tach/dash panel such as an Acewell.?Nice and compact,no cables to worry about.They have a number of different models to choose from.
Save yourself a lot of headaches trying to find the speedo to match the drive on the Guzzi.
Brett
Yep, I've found a couple of cheap electronic displays on ebay, and it would appear they'd be easier to sort out. Shame though, I was kind of hoping to keep a more traditional look, but it sounds like it's gonna be a pain in the ass just trying to work out which speedos I can consider.
No that I've sorted most of the real problems on my SP, I started thinking about the speedo and odometer, which has always read about 10% high. Obviously, if the odo reads high, the gearing is wacko. I remembered looking at Palo Alto Speedo's webpage, which suggested disconnecting the cable and driving a known distance while counting turns by observing a piece of tape stuck like a flag on the end of the cable.
I figured I'd have a hard time with that. So I hooked up a long rubber band, and taped it to the windshield. I have a bicycle computer on the bike, which is dialed in using GPS and milemarkers. Drove 0.05 mi accoding to that, and counted the turns to unwind.
I came up with 95turns /0.05mi, with stock tire size.That distance works out to about 80.5 meters. Now that I know that I'll talk to them again and maybe send it in for a winter vacation.
I figured I'd have a hard time with that. So I hooked up a long rubber band, and taped it to the windshield. I have a bicycle computer on the bike, which is dialed in using GPS and milemarkers. Drove 0.05 mi accoding to that, and counted the turns to unwind.
I came up with 95turns /0.05mi, with stock tire size.That distance works out to about 80.5 meters. Now that I know that I'll talk to them again and maybe send it in for a winter vacation.
So it sounds like the speedo section of yours is just plain stuck? Does the odometer seem accurate? Mine has been consistently off the same amount the whole time I've had the bike.
On these old analog units, the speedo can get messed up even if the gearing is correct. Haven't looked inside a Veglia, but most auto types use a magnet and vane thing where eddy currents get induced in the vane. No real idea how they adjust them, maybe a spring bias?
A friend of mine restored a Ducati 750GT, and his speedo was reading high. He sent it in and it was returned with a large print "grease warning!". He said there is a zerk fitting on the front wheel speedo drive box, and he had put his grease gun on it and without thinking, pumped it full and then some,driving grease all the way up the cable into the clock. Bit of a hoot there.
On these old analog units, the speedo can get messed up even if the gearing is correct. Haven't looked inside a Veglia, but most auto types use a magnet and vane thing where eddy currents get induced in the vane. No real idea how they adjust them, maybe a spring bias?
A friend of mine restored a Ducati 750GT, and his speedo was reading high. He sent it in and it was returned with a large print "grease warning!". He said there is a zerk fitting on the front wheel speedo drive box, and he had put his grease gun on it and without thinking, pumped it full and then some,driving grease all the way up the cable into the clock. Bit of a hoot there.
My speedo seems to become more and more inaccurate the faster I go. At maybe 50mph it is 10 or so mph over, but but the time I hit the ton the speedo is off into cloud cuckoo land - I've seen 160mph on it when I reckon I was doing around the ton.
But I want to change it for aesthetic reasons too, I'm ripping the whole dash out, keeping the rev counter, and making an alloy bracket to house it and a small speedo (if I can find one) and some idiot lights. The way it's going at the moment though, I reckon I'll end up with a digital console. Not what I want, but it may just be the easiest way.
But I want to change it for aesthetic reasons too, I'm ripping the whole dash out, keeping the rev counter, and making an alloy bracket to house it and a small speedo (if I can find one) and some idiot lights. The way it's going at the moment though, I reckon I'll end up with a digital console. Not what I want, but it may just be the easiest way.