I haven't got around to getting all thread to make a new bolt but for now the original bolt with silicone and no washer seems to be holding.  I did drill out the brass plug on the carb and adjust it and and idled it up a bit and now it will idle without the noise for the most part but if I just pop the the throttle while it's idling after the Rev falls back to idle the noise is there for a second then gone again.

The bolt you have is 130mm long M6x1.0

here's a 140 long bolt (5.5")
https://www.boltdepot.com/Product-Details.aspx?product=7101

I'd put it in till it bottomed out, measure how much to cut off, compare with the old bolt, then cut it a little shorter to allow for tightening.
You don't want it to bottom out at torque.

The longer bolt solved my leak and dave I pulled the cover off f the front of the engine but I wasn't able to see anything with the engine in the bike. No good angle to see. I think I am gonna take the bike for a good ride this weekend and see how it acts, I haven't really took it out and opened it up because I didn't want it comong apart on me going down the road! But I have fresh oil and two new tires so I think I'll find out how does on a real ride this weekend and hopefully I won't come skidding to a stop with a locked up engine