The only difference is the nut and the thread screw it locks in place. This
thread is a larger size....

Mike Collum wrote:

> FWIW ... when I got my '85 1.9 the rocker on one side has larger nuts on
> the adjuster than on the other side.  I have obtained another set from a
> 1.9 but haven't chenged them yet as the engine runs fine ... and has for
> the 30,000 miles I've put on it since replacing the head gaskets ... 280
> miles after picking it up.
>
> Mike
>
> Old Volks Home wrote:
> <snip>
>
>> The visual differences are that the adjuster screws/nuts are different
>> (larger on the 2.1).  If there's a difference in the geometry/ratio
>> between
>> the two, I couldn't say.  Boston Bob would surely know.
>
> <snip>
>
>