Servicing the carburettor is quite straightforward, as long as you have all the parts. Ordering new parts can be a bit tricky but there are a few good firms out there like www.faak-tillmanns.com.

The process is quite straightforward:

• Take the old carburettor apart completely
• Thoroughly clean all parts (I use an ultrasonic parts cleaner)
• Make sure that all passages are clear of oil, dirt and debris. You should clean parts by blowing through them only; ideally try not to stick needles through it if not necessary. Carb cleaning tools can damage the passages and create places for dirt to gather.
• Should your carb be extremely dirty, you can use a carb cleaning tool like this one:

• Put the carburettor back together, but make sure you put the right jet in the right area. The starter jet is size 70, the stationary jet is 40. Do not confuse them if you want a properly running machine.
• Finally, make sure that the starter piston is not missing the rubber seal; otherwise it will be always on; here’s a picture of the piston missing a seal:

You can order a new one from the nice people at www.mza-portal.de  they carry the part as a ‘Bing Startkolben – 53/24/201/201’.

When taken apart, the carburettor, type 1/24/116 (refer to the diagram in the documentation section or the spare parts list elsewhere on this site) looks like this:

A jumble of parts, so here’s how you can rebuild the carburettor in order: