Well in reality most of the deposits seen on the top of the head near the exhaust, I had already scrapped off. More testing will determine whether or not the investment of $72 was worth it. I simply had warm water and LA's Totally Awesome cleaner in it too. Other solutions will be tested as well.

Can you provide the video link where I show timing with the dot 180 out? I do not recall ever doing that, but with over 1700 videos and hundreds of engines through my hands, how can I remember everything?

@@dmrcflyr2 i don't mean to bug you, just trying to learn a few things before I overhauls mine os-70. In this video at about 7:25 you mention " inline with the pushrod tubes about the 5:30 position".

This should clarify. kzfaq.info/get/bejne/raeGrMRzz96wmn0.html Now this video shows the dot 180 degrees out like you mentioned. Both consistently show the piston at TDC; thus that is the key. kzfaq.info/get/bejne/aMV_nbqWsLaso3k.html I am quite sure that the timing is mentioned in the book A complete guide to O.S. model 4/strokes. But good luck ever finding a copy of it.

@@dmrcflyr2 Thank you for clarifying this point. I appreciate it as I appreciate all your videos. Any tips/advice on which gaskets to replace or are important. I noticed companies selling rocker cover gaskets but my OS did not come with a rocker gasket. im assuming only the intake and back plate are important?

If you look at time mark :57 you can see the intake valve is the larger one.

@@dmrcflyr2 thanks David good luck with your new location

@@billkourtis2698 This article also shows the intake and exhaust valve seats. Might talk about the sizes too. sceptreflight.com/Model%20Engine%20Tests/OS%20FS-120%20Surpass.html

Very helpful Thank you David

I didn't notice any difference at the time. If they are different I guess I had a 50/50 chance of getting them back in the same spot.

What do you mean a year to figure it out? If you were familiar with my channel at all you would know what I use ALL the time. It is mentioned at least 12-20 times in my videos.

Hi David, well, guess I'm not that familiar with your channel then.... LOL! At any rate the video itself states you'll look into various solutions to use in the ultrasonic cleaner and I mistakenly assumed the video had been made a year ago. Thus the question: what did you decide to use as your preferred fluid. At any rate, I've since watched several of your other videos and have come to the conclusion that you use LA's totally awesome cleaner. Thanks for the videos, keep'em coming.

From the OS engines FAQ site. The proper way to set the timing in all O.S. single-cylinder engines with the front camshaft is: 1. Rotate engine so that the piston is at Top Dead Center. 2. Locate the timing mark on the side of the cam gear. 3. Insert the cam gear so that the timing mark is in a direct line with the center of the cam followers and the centerline of the pushrods. It is NOT at a 90 degree angle to the crankshaft. The angle will be slightly back. 4. Replace the cam cover and you're ready to go!

@@dmrcflyr2 Thank you David. Whenever i will attempt this, i will first look before i disassemble it. I really enjoy your videos and that of the Slovenians Brothers 😀🇳🇱. I just finished my first os max .46 fx engine with bearings and all. Thanks🍻