Speedo Bounce

willy mac · Apr 29, 2013

Does anyone suffer from the speedo needle jumping about? Speedo is the standard Green spot version, Cable is a new one, the speedo can jump from around 60 to the occasional 90, but is more stable at lower speeds?

marc · Apr 29, 2013

yeah mine is also jumping around. the one on my old vespa is doing the same thing. so far i havnt been bothered to fix it yet.

pete.v · Apr 29, 2013

willy mac said:
Does anyone suffer from the speedo needle jumping about? Speedo is the standard Green spot version, Cable is a new one, the speedo can jump from around 60 to the occasional 90, but is more stable at lower speeds?

Bushings and what-not are failing on the inside. The next step will be the needle breaks off.

kommando · Apr 29, 2013

Check that the inner on your new cable is not too long, if it is then your speedo will not work for very long.

lardygitTVR · Apr 29, 2013

Is the speedo cable cable-tied to the swing arm? You may have to slightly rotate the drive unit to ensure the smoothest possible cable run. Doing this finally cured five years of faffing around with rebuilt speedo, new cable and new speedo drive; my speedo was going berserk over 40mph and is now near as dammit perfect.

mike996 · Apr 29, 2013

Mine did that; new Venhill cable eliminated it and made it nearly rock-steady.

drones76 · Apr 29, 2013

Mine did that also. It wound up being the speedo gear at the rear wheel. The square hole is worn so it does not hold the cable properly.

willy mac · Apr 29, 2013

Thanks guys

A few wee things to ponder over there!

Onder · Apr 29, 2013

I have found the original smiths gearbox has a square drive hole slightly different
than the repros on offer. My genuine cable didnt fit the repro gearbox. Others
are correct about routing the cable.

cmessenk · Apr 29, 2013

Went out for a shake-down ride with my Bud who's 99% finished with a restoration on a 1970 750 high-rider....original yellow to boot. Heading out on SR60 over Tampa Bay to open the resto bike up I was following at 65 -75 mph and noticed my tach at 5 grand and only going 65 mph or so....I thought WTF, great....now either my speedo or tach is acting up. Got caught by a red light at the eastern end of the Causeway...downshifted for the light and

realised I had been cruising in 3rd gear. Proper shifting after the light revealed all was well....guess I haven't been riding enough lately. :lol:

Speedo Bounce

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