The speedo on my Stone has been growing increasingly irratic of late.
That is, the needle jumps around wildly, sometimes more than others.
Generally, it’s OK(ish) up to around 80 mph after which I could be doing anything between 40 - 140 mph.
Also, it seems to be engine (drive train) related. If I give the throttle a “fist full” in any gear the needle goes wild. Travelling along at say 50 mph all is well but if I increase throttle to maintain speed up a hill, it goes wild again.
Conversly, if I am traveling at 90 mph (wild needle) and shut the throttle off, the needle becomes steady while on over run.
I have had the cable out and cleaned and lubricated it, also ensuring a smooth cable run. This made no difference. So I guess it’s either the speedo itself or the speedo drive in the gearbox.
Anyone have any thoughts on this? A gearbox drive issue seems unlikly but in view of the symptoms I wonder.
(I have noted the speedo repair and other comments from recent posts about speedo’s)
Sounds a lot like something in the speedo drive train is slipping under load and picking up again, could be the nylon gears in the speedo, hopefully it is not the gearbox drive stripping as that would put debris in the gearbox. Hope this does not unduly worry you but all possibilities must be considered.Cheers, Gerry.
Spaying a liberal helping of silicon grease into the clock mechanism provides for a significant if temporary improvement. I gues the clock is on the way out. I discover 80mm speedometers are available along with a hall effect sender that screws into the existing speedo (gearbox) drive. As electronic unit seem to cost ~£180 as opposed to a replacement Veglia from Guzzi at ~£480 maybe this should go in the OEM section?
Smith’s speedo can be customised to customer preferences so looks like I will be going with the Smith’s classic with the addition of a KPH inner ring @ +£20 and sender from the same site. Hope this proves useful.