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Category: Other Mopeds

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Bennos Monza – Engine

My friend Benno bought a 2-speed Puch Monza from 1981. The engine sounded terrible, it had a very loud constant bearing whine. So we’re taking it apart, clean everything, replace the crankshaft, bearings and seals. I also had the chance to test my new ultrasound cleaner, which did a great job on the very filthy Bing 12 mm carb.

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A quick video of the warped crankshaft:

I know it’s not the right way to check this, but the damage is obvious in this case. I think it must have less then 0,05 mm trow to be usable.

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Puch VZ 50 – JPS

Just to make sure that i don’t get bored, i promised to help “JPS” with his Puch VZ engine. JPS is a very active member of the danish forum billig-scooter.dk.

The engine had knocking noises and leaked oil, so i’m going to change all bearings and seals. The crankshaft is also worn, so it will be changed to a new one.

There isn’t anything other wrong with the engine, all mechanical parts look good as new.

This gallery will contain all the images i take while doing the repair, remember to look for photo comments:

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A short video of the noises, it was worse and visible in real life: