38mm pwk ?

Not really, a few have used them on drag engines, stick to the 35/36mm carbs that have proven jetting info for trail machines
 
Had a quick question I can't find yamabond 4 at any of my local parts stores I can find yamabond 5 or hondabond 4 would u recommend either of those for the crank case or will any of the permatex stuff work ? Thanks for ur help