New member from Finland, Z500

Hi.

Just joining the forum to get some information and help if needed.
I'm rebuilding my Z500, i think its from 1980.

Hey, and welcome! Doesn't look too bad in the jugs...just going for a refresh or was the engine acting up?

That number stamped in the case should get you the exact year if you want it.

Welcome HP.

Valve seals needs to be replaced, also one cylinder gave lower copression than others.
Need to find out why.

Here is the serial

A puff of blue smoke on cold start up from and old bike is no big deal. worse if left parked on it's sidestand. Low compression can be sticky rings, common on motors that have not run for a while. Running a tank of fuel through it and giving it some stick usually sorts this.

Welcome and good luck. Some really great metal music coming out of Finland!