What fork oil weight to run?

[Proxy]

I'm restoring my dad's 1988 KDX 200 for my bro and I just replaced the fork seals, so I'm wondering what weight oil I should run.

I have a fresh bottle of BelRay 15W on the shelf that I'll gladly throw in unless there's a reason not to.

This bike will be for novice trail rides only.

 

[76GMC1500]

Most bikes run 7w from the factory.

 

[JohnRaven.exe]

My 86 Yamaha XT350 runs 10 weight...

 

[glad2ride]

Jeff Fredette suggests 7.5w for those forks.