OH, I didn't realize that about the HS 142
Unless he has a Boar A Scope to take a pic through the S/P hole . A reg pic through the S/P hole ain't gonna show Zip.
I say don't worry about it and if the carbon build up is so bad that it fouls the S/P then he is gonna have to tear down the engine anyways to see what up. Nothing is really gonna help if the carbon build up is as bad as he says it is. Except constant cleaning of the S/P
Yea sorry been AWOL but give me a bit I did add some additive to my gas and it looks as if it has helped alot tbh I'll pull the plug soon I've been busy restoring a grill for my uncle lots of sanding left to do