I had the first 81 RM465X in town back in the day. Here's what I remember doing to mine.
Added an idle screw from a PE model. It's simple. Simply drill the hole, tap it and add the screw. Should be able to find one in a junk yard. Presto, now it idles and doesn't stall. :yeehaw:
While you are at the junkyard, look at all the old 81-84 model RM's and see if you can find a set of the aluminum adjustable rear struts for the Full Floater. They will allow you to adjust the turning habits .
Install a set of fork springs appropriate for your weight. The 465 was a bit of a stinkbug with the original springs.
Start looking for another pipe ASAP. If yours isn't cracked in the main belly, IT WILL BE. :think:
File the back of the slide down if you have the round slide Mikuni. Probably .5-1 mm should do it and make it much crisper.
Watch 3rd gear for slippage. They have been known to go bye-bye.
Go to
www.suzukionly.com for an article on drilling the carb for better fuel flow. The stock carb will drain the bowl at high rpm.
Once you do all this, hold on tight. :aj: