What is this for?

[Dave Pitman]

What is purpose of this hole?

 

[larryg]

it's a screwdriver adjustment for the rear shock damping. There is a video that shows the proper way to do this, a search should find it.

 

[Dave Pitman]

Okay, thanks! I thought it might have something to do with the shock.

 

[Willsmotorcycle]

 

[schlep1967]

That's the one spot they drilled out to make the bike lighter.......

 

[Dave Pitman]

@Willsmotorcycle Thanks for the link. Finding the purpose of the hole led to an hour and a half of preload and rebound research on here that included that video and another on filling the preload system. Turns out that has been added to my todo list as soon as I get some 10w jack oil.

 

[Obo]

That's the one spot they drilled out to make the bike lighter.......

And here I thought it was to help let the engine heat escape....

 

[dduelin]

@Willsmotorcycle Thanks for the link. Finding the purpose of the hole led to an hour and a half of preload and rebound research on here that included that video and another on filling the preload system. Turns out that has been added to my todo list as soon as I get some 10w shock oil.

Hi Dave. The type of preload adjuster oil isn't a mission critical decision. I believe any fork oil or hydraulic jack oil would do just fine. This type of Showa preload adjuster is used on several different brands of motorcycles and these types of fluids are commonly used with good results in several brand or model specific forums.

 

[Dave Pitman]

Thanks Dave. I'll pick up some hydraulic jack oil.

 

[wjbertrand]

I re-filled mine with some left over ATF I had. Works fine.

 

[dduelin]

I re-filled mine with some left over ATF I had. Works fine.

There you go. I used ATF in the forks of my old BMW and it did work good.

 

[Sadlsor]

Geez, guys, what's next?
Bacon grease?
LoL!