Gt500 tacho

[Yorkshireman]

Morning all. Noticed a minor issue with the tacho in that when I start the engine the needle rises to match the revs but then falls to rest when I pull the clutch and engage 1st gear. It then operates as normal when I ride off?? It has a new cable. Obviously one half of the gearbox stops when a gear is engaged at standstill but my concern is that as the tacho is driven off the oil pump drive that the pump isn’t working for a brief period. I did 30 miles on it yesterday so the pump is clearly doing its job I just can’t work out why the tacho needle is behaving like it is. As far as I can tell it’s not possible to fit the drive gear incorrectly so does anyone have any ideas as to what’s going on please.

[jabcb]

Normal behavior.

The oil pump is driven by a transmission gear, and the tach is driven by the oil pump.
So the oil pump & tach are not driven when you pull the clutch.

While it seems like this would be a bad design, the T500 is one of the longest lasting vintage two stroke engines. The bike sips two stroke oil at such a slow rate that not a having a sip every now & then is not a problem.

But as a practice, I do not sit at for extended periods at traffic lights & etc with the bike in gear & the clutch disengaged.

[Yorkshireman]

Thanks for the reply and the explanation which has put my mind at ease. I was selecting neutral at a standstill andd dc will continue to do so.