Hello, Mr. Scotty Kilmer and Friends

I have a 2 Questions for y'all

1. What do you think about using Smith and Wesson Fixed Blade Knife to cut any kind of rubber hoses parts on Cars and Motorcycles? My Uncle is experiencing a problem when he tried to remove flat worn out rubber-based Radiator Hoses and replaced it with Silicone-based Hoses 'cause the stupid Radiator Hoses Clamp is stuck and can't be removed on his 2008 Lexus LS 600hL with 223k miles. So he's going to use those Knife to cut the hoses & then later figure out other way to get rid of the stupid clamp from his Car
2. How can I know if the Head Gasket out of Air-cooled Motorcycle is starting to gone bad? My Brother 1978 Honda CB750 with 350k miles is starting to accelerate like an ol' lady drivin' in the Highway/Run Like Crap

Thank You

P.S: He's the Original Owner of those LS 600hL

The Hybrid System of his Lexus is still Work Perfectly Fine and the only serious work that ever done on those Lexus is Hybrid System Software Updates every 5 years to ensure the Hybrid System didn't gone bad