correct head?

[alexxx]

Hi,
Enquiry on behalf of person selling some MZ's.
This is an MZ ETZ 300 but the head shape looks different, it has vertical fins, is it the correct head for a 1988 MZ ETZ 300?
The bike is running fine and has been like that for years.
Thanks

[Skorpion]

Yes the vertical finned part is only an added extra top to the original flat head, this was fitted by the importer Wilf Green to differentiate it from a 250, it can be removed easily.

[alexxx]

Thanks,
I never knew that
Glad you are an expert !
Thank you so much

[Guesi]

But the model in the front (ETZ 250)was never produced with 300ccm.
Only the model in the back (ETZ 251/301).
So it is not original.

[Skorpion]

But the model in the front (ETZ 250)was never produced with 300ccm.
Only the model in the back (ETZ 251/301).
So it is not original.

Hi
The ETZ300 was the UK MZ importer Wilf Green's model, not an official MZ model.

It is an over bored ETZ250 fitted with a Mahle piston, all 4 I have had dealings with had a wide squish band and pulled like a steam engine, though were reluctant to rev out.

Setting the squish clearance to 0.9-1.0 mm makes them as peaky as the ETZ250 but far quicker.