If you do a search on here you will find some of us have made covers for the push rod to keep the crud off and save the seal.
Now while you have it apart would be a good time to make one and fit it.
I used a very light spring with some heat shrink over the spring, be warned the motor seal can be easily pushed back into the motor so something light is required as a cover.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.