I find most user forum search engines to be terrible at what they are supposed to do. Usually instead of using the forum's search feature, I open up a browser tab in Google and google my search. For oil, maybe something like this;
tw200forum best oil
Then what pops up is a list of links with a few words pulled from the link's text that might give a clue of what I am going to see if I click the link. In my example, tw200forum best oil, this is the first listing in google;
Re: THE BEST.......... - Yamaha TW200 Forum
tw200forum.com › ... › TW200 Forums › TW200 General D...
Jul 11, 2010 - 10 posts
As an oiler by trade I've been on this quest to find the best oil for Tdub. Fortunately there is a lot of good oil out there. That little oil window ...
oil weight - Yamaha TW200 Trailway Discussion Forum 25 posts May 2, 2010
Re: Mobil 1 Synthetic Oil - Yamaha TW200 Trailway ...14 posts Mar 6, 2010
TW Oil Change - Yamaha TW200 Trailway ...25 posts Aug 9, 2008
Genuine Yamaha Oil Filter - Yamaha TW200 Trailway ...10 posts Aug 18, 2007
More results from tw200forum.com
There are now several links to view; the first that comes up, then several there in succession that I can click on.
Anyways, I find in most cases to be more useful than the search feature that comes with most forums.