1973 z1 900 motor differences?

Picked up a low vin# z1 900 motor today. I see the cylinder doesn't have the groove for the o-ring......is that '73 z1 only? Anything else different?

Ask at www.aperaceparts.com or www.redlinecycle.com They are but a few of old bike engine rebuilders that have the knowledge to answer your question.

Those cylinders are used up through engine Z1E-14317. They are fairly hard to find, so you may want to consider reselling the engine if it's still in good condition.

What is the engine number?

Jeff, the vin is Z1F-02198. I will probablly sell it. Know anyone interested??

z1900 could you post a picture?...Russ

I don't know anyone specifically - but there are far more people interested in 72/73 Z1 engines. One of the local guys here just sold just a set of engine cases for $400...

The heads are also unique on engines under Z1E-02200 - the vacuum take-off is in the head, not the carb holders.

Too mine didn't come with the head!

Heres a pic: