Das MZ Forum für MZ Fahrer

Hello gents, I realise there may be a language problem but hopefully someone on here may be able to help me with the following problem. I've recently bought a Mz 500 Country, Rotax engine, which seems to now have an oil pressure problem. The oil pressure indicator light comes on and does not go off when I ride/rev the bike. I noticed the light come on just recently on the way back from a ride and obviously this has now got me seriously worried. Has anyone come by this fault before and can they offer me any possible reasons for this. Looking at the wiring diagram the pressure switch has to break for the indicator to go off which seems to rule out faulty wiring. Could I be left with an engine strip down to check the pump or is there a way of checking the oil pressure before I embark on this.
Cheers, Brendan.

Hi Brendan,
a luminous Oil indicator light is no problem to 2000 1/min. The Rotax is a dry sump engine.
Possibly, the oil filter should be changed and the pressure holding valve underlying be controlled.
Do you have a diagram of the oil system?

Congratulation to Your Country

Rotax says the light should be off above around 3000 - 3500 U/min with hot oil.
You can test the pressure with a gauge (0 - 2 bar or so) instead of the switch (thread is M10 x 1), pressure should be about 0,5 bar at 5000 U/min.

The switch just connects the light to ground, so if wiring isolation is damaged, this could cause the light is always on.
To test this, you need a single cable for connecting the switch direct to the light.

Maybe someone from the MT Riders Club is near by you and would help?

I once had this problem with my Silverstar, the isolation of the cable from the oil pressure control was damaged. So the light was permanently on.