Im going to take apart my Magnum 91 fourstroke and remove the carbon from the valve, as I have a leak through the exhaust valve. When I re-assemble, is there any particular rule of thumb for how tight to put the cylinder head back on, or do you just tighten them down real good? Any other tips to avoid possible mistakes would be appreciated. I have done this countless times on two strokes, but with the more complex fourstroke, it just seems like everything needs to be perfect. Thanks

Alex