As for Acetone, it's just something I briefly read, that if you get a small engine that's running poorly, mix a little (unknown amount) Acetone in with the fuel, the Acetone suppose to help cleanout the carb as the engine is running, making it (not always) run smoother 'if' it's a dirty/clogged carb. If it works, certainly beats tearing it down to clean (then replace gaskets etc..). Never done it myself though, just something I came across.
Sometimes I get 95 fuel and use it in the mower, not often though, may have to get a couple litres. Can you use 95/98 with stroke or do the cleaning additives affect the stroke fuel/oil mixture?
Never had problems using 98 since 2017. best I have used is ampol 98 - no idea what they put in it but several of my machines started running noticeably richer after running a few hours on it. was able to lean out the carburettors so it obviously cleaned something out.
Don't bother with acetone. Acetone is the main ingredient for carby spray, but it needs to be mixed in with xylene and tolulene to have good effect. also, stick a nitrile rubber glove in acetone and stick another in petrol. The acetone will attack the glove. Carby diaphragms are (predominately) nitrile.
Go down to bunnings and grab a 120ml bottle of "mechanic in a bottle". Sounds like a scam but it has saved me going into countless cheapo trimmer carbies I really didn't want to stuff with.
