my quad is 50" wide, so trails are nearly impossible for me along with a 4" ground clearance lol
are you familiar with transmission work on the 4 strokes? I can take a 2 stroke apart with my eyes closed, but havent done a 4 stroke yet, which is why I have been putting off fixing 5th.
as far as shims, I have titanium valves. I have rode my quad for the last 3 years and it still starts/ has the power like the day I brought it home…
My sister just had to shim her 250f…she only had a season of racing on it.