Technical Information Pages for the Restoration of the heavy military bikes BMW R75 and Zündapp KS 750.


Editor:  ERSATZTEIL    DIENST       Hans-Peter HOMMES       41363 Jüchen Kamphausen 156 C/2

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Exhaust Manifold


H - P Hommes


© 2009 h-p hommes





Temperature problems

A veteran friend of mine had the following problem with his allegedly restored BMW R75:
The exhaust valve of the right cylinder hang tight for the third time.
The valve guide was replaced, the valve stem was given almost double play.
Nothing helped.

Since this was not a material problem but rather a temperature problem, he came up with the idea to examine its existing exhaust manifold closer.
He ripped the right side of the manifold apart and found the situation of the exhaust system depicted on the left.

It formed such a strong backlog that the right cylinder was excessively hot and the valve is stuck again and again.

After he had cut the collector pipes that were too deeply located in the exhaust accordingly, the operating temperature of his engine fell back to normal levels and there was no stuck valve any more.

Not everything that looks like an exhaust also works reliable.



Also see report Zündapp KS 750  Engine problems due to incorrect exhaust-


We offer:

Spare parts + accessories + repair for engine, transmission, etc. of the
Zündapp KS 750 and 600

We offer:

spare parts + accessories + repair for the

BMW R75 and Zündapp


H-P Hommes Ersatzteil-Dienst
Ersatzteile + Instandsetzungen
repairing + restoring

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