I have a conrod kit that has been ‘in stock’ for yonks but which I believe is for a TS125/150. I also have what I thought was a TS125/150 flywheel and today I decided to match them up with a view to rebuilding a spare good crank.

However, when I measured the crank pin that is part of the conrod kit it is circa 25mm diameter though the length seems correct. The crank pin in the flywheel is circa 28mm. Did MZ change the crank pin size on the small TS’s or is perchance the flywheel from an ETZ125?

Thanks

Not sure where i got it from but in the garage is an etz alternator complete with what seems to be an electronic ignition system. There is a pickup which locates to what would have been the fixing screw for the condenser and a rotating part which is held by a peg on the stator and fits into the place where the points cam would normally sit on the alternator rotor. This piece has its own bearing and spins nicely.

I am intrigued to see if it works and physically i can fit the device but the wiring has me confused. The pickup wires are all attached and run into a small rectangular box which has a couple of rubber grommets (though exactly where it would be located is still a mystery).

Three other wires come out of the box; all with ring connectors, Brown (assume this is earth) green and a black with red stripe. I guess these connect to the coil and that the black/red connection is also for the live feed from the ignition switch since this is the same colour as the present coil feed. There is no other obvious way to connect a power supply.

Anyone know if this is correct or better still point me to a wiring diagram for this era. All of my manuals and documentation only show ordinary coil ignition with points.

Thanks PeterF

My newly rebuilt TS250 has a pattern BVF carb. Initially I had problems with it refusing to allow anything less than a 2k tickover. Not sure what the problem was but after a strip down and checkover all seemed well.

Today I took the bike for an 80 mile round trip. Nearly home. I was cruising at about 50mph but when i backed of for a corner the bike kept gaining speed! The slide had jammed in the carb. Luckily there was no one close behind so I was able to switch of the ignition and trundle to a halt. Took me a while to suss the problem which was the little brass pin on the RH side which locates the slide in the bore. This had moved outwards allowing the slide to rotate to the point where it jammed on the tickover adjustment screw.

I tapped the pin back in place but it went so easily that it is clearly a loose fit and back home I used some araldite to hold it in place pending a proper repair.

If you have one of these pattern carbs whether for 125/150 or the 250 variants it might just be worth checking if the pin is loose!

PeterF