We (Adam and I) did Harrison West and Mystery creek to North Chehalis and back with a few side trips on Friday
Francis lake, Ten Mile bay and Hale Creek.
From Francis lake junction d
Back down to the Main FSR there are numerous water bars. Big bikes need to be aware.
Have you done the roads on either sides of Stave lake? Have you been up the Chehalis lake area or the Harrison lake east or west?
I am in Maple Ridge if you want a tour of those areas. Also retired so have some free time. Riding either my VStrom 650 or DT200. Depending on the days, I might be...
14 is the largest that fits, 13 is stock. 12 is fine if you have proper chain slack. 38000 km on mine with no swing arm damage. Maybe if you ran a 12 with the stock 43 rear this could happen. I have always had a 48 or 50 on the rear.