Well right away after the leak down test was negative on that cylinder tells you you have to pull the head off to assess the valves . Yes spark plugs have been getting worse and worse through the years. Luckily, there are some tricks to get them out when they break .
They are called keepers bruv, keepers.... If the keepers popped of the valve head, the valve and or seat is compromised. Those plug threads in #1 are hammered and will continue to cross the plug when bottomed. The C series NGK plugs will break off like that when the threads are gulled.
You can use twine or kite string in the cylinder as well to hold the valve up. That head needs to come off regardless. That engine appears to be a junk design.
Well right away after the leak down test was negative on that cylinder tells you you have to pull the head off to assess the valves . Yes spark plugs have been getting worse and worse through the years. Luckily, there are some tricks to get them out when they break .
They are called keepers bruv, keepers.... If the keepers popped of the valve head, the valve and or seat is compromised. Those plug threads in #1 are hammered and will continue to cross the plug when bottomed. The C series NGK plugs will break off like that when the threads are gulled.
You can use twine or kite string in the cylinder as well to hold the valve up. That head needs to come off regardless. That engine appears to be a junk design.
Spoiler water all the PWC have the same plugs.
@@seangreene64 😂 wrong - there are at least three different thread sizes used M14 - M12 and these smallest and weakest M10’s.