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Post by joneill4 on Jul 18, 2007 16:13:58 GMT -5
I followed my buddy down the road last night and he, like eveyone else I get behind was going slow as hell. When we got to his house, I asked him why he was going so slow, and he said he wasn't. It turns out that at 50mph, my spedo reads 42mph. I cant imagine that I can buy a gear like a modern car. Anyone else run into this? Any fixes?
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cordodor
Full Member
'79 SR500
Posts: 109
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Post by cordodor on Jul 18, 2007 16:23:24 GMT -5
are you using original sprockets?
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Post by colinjay on Jul 18, 2007 17:35:00 GMT -5
Hi,
It is very unusual for a speedo to read slow, but any thing is posibble with old bikes. There are no alternate speedo drive gears that I know of and you final drive sprockets will not affect the speedo reading sice the speedo is driven from the front wheel.
Are you running a non-standard sized front wheel? If it is not the std size it will effect the speedo reading. The best way to check how accurate a speedo is, is against a portable GPS unit, I have used on to check my ute's speedo and at an indicated 115kph the GPS has me doing 110kph.
CJ
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cordodor
Full Member
'79 SR500
Posts: 109
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Post by cordodor on Jul 18, 2007 17:44:34 GMT -5
you final drive sprockets will not affect the speedo reading sice the speedo is driven from the front wheel. ;D stoopid moment... my last bike effectively used the rear. |
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Post by wotavidone on Jul 29, 2007 18:50:34 GMT -5
After checking with GPS, my bike is actually doing 94km(58 mph) when the speedo says 80km(50mph). My front wheel and tyre is as standard as you can get.
Seems like a common problem. One does wonder whether the drive gears from an XT would fit and whether this would sort out the discrepancy?
Mick
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Post by sirhaxzealot on Aug 16, 2007 0:11:33 GMT -5
I put a Schwinn bicycle speedometer on my 1981 SR to check if the speedometer was accurate. It was perfect between 30 and 65 MPH. Below 30, I can't remember. Above 65, the Schwinn speedometer goes peculiar, it might read anywhere between 30 and 50. The bike's speedo is one that only goes up to 85 MPH. My 1978 SR's speedo goes up to around 120 MPH. I haven't checked it with the Schwinn speedo, but according to the tach, the speedo reads about 3 to 5 MPH higher than the other bike when my tach tells me I'm going 55 (sprockets are the same on both bikes, but I'm not completely sure on the transmission gear ratio, so don't quote me on any of this). I would take the Schwinn speedo off now that I've tested the bike's speedo, but the drive cable has broken about 3 times now. It's handy to have a backup when that happens.   Hax |
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Post by milkman on Aug 16, 2007 8:38:56 GMT -5
Nice installation
So you just hot glued the magnets?
No issues with them staying on yet?
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Post by sirhaxzealot on Aug 16, 2007 21:19:36 GMT -5
Yep, hot glued, and they've been staying on for a year now. I used hot melt glue because I thought I would be taking the off soon, but well....
I wouldn't mind finding a speedometer (or maybe it's the sensor) that doesn't go crazy after 65 MPH. When I noticed the problem, I tried moving the sensor closer to the magnets, and when that didn't work, adding another magnet beside the one I already had. No change in operation though.
Hax
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Post by milkman on Aug 17, 2007 6:45:35 GMT -5
Not to much of an issue here.
Most speed limits in AUS are bleow 65mph, so you already know that if its gone crazy, it represent the "tear up licence" pace
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Post by sirhaxzealot on Aug 17, 2007 14:44:49 GMT -5
Same here, but the freeway speed limits are usually 65 to 70 MPH. No one drives that slow on them though, 75 to 80 seems to be common practice for most motorists. Scary on a bike.
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