Time for my 10,000 mile service. I read all the post I could think of but what about the gasket? If you add the primary oil through the clutch inspection plate do you have to change the gasket? Nice to know before I start the job.

 

NO. It's a rubber o-ring. The primary chain inspection cover gasket is another thing. You can usually get ny with good silicone sealer, but I'd recommend a new gasket at least every other time you pull it off.

 

For your 06 it's not a rubber o-ring. It's a disc. #25416-99C It is easier to add fluid on your scoot through the chain inspection cover, but at 10k service you will want to do a clutch adjustment also so you can stick to filling it through the derby cover. Cheap insurance to change the gasket, don't cost much.

 

Your bike yes, new gasket. My bike has the o-ring and I have used mine 3 times...Just another of the many time & money saving benefits of the Dyna series...

 

I bought a new Derby cover gasket anda primary chain inspection cover gasket before I did my 5000 mile service about 7 months ago and didn't use either one. The old ones looked good so I decided to reuse them and haven't had any problem with either one leaking. I willchange themwhen I dothe 10K service.

 

The gaskets cost ~$10 or so. Could I have re-used the old ones? Sure, but since I had new gaskets I used them. The next time I think I'll also change to O-ring on the drain plug.

BTW, I put Rotella T syn in the primary. Based on other threads here (and independent lab results posted online) I'm thinking it is better to have a high detergentoil that cleans the moving parts than other oils that look brand new after 5000 miles but leave the grime inside the engine.