Here’s one such thread. Feel free to read whole thread, but post #45 on is where you need to read:

https://www.offshoreonly.com/forums/...gen-6-a-5.html

YOU are my favorit profesor SB...So you think the litle chain gear that goes on the crank was mounted wrong and because of that the cam is too advance...yes?

If it has multiple keyways, than very possible.
Many gears, include factory OEM, only have one.
Many of us still use a degree wheel to make sure the cam is in where we want it. Many don't.

Than you SB so much...yust one thing more!When i read that the cam is let's say 235/237/050 is that lift in inc...0.235/0.237 inc lift

No.

instead of me writing a book, there are many articles and books to read.

Start with a decent article like this:
https://www.enginelabs.com/engine-te...th-erson-cams/

Thank you SB ill read it all so we can comunicate better...my respect to you

Yes 2.5mm. ex valve should be fine. Rotate cranksahft to 11* before top dead center on overlap stroke. Then remove valve spring push the valve down see how much Clearence you have

Hey crew...yust a update from yesterday..I opend up my faze chain.
https://cimg4.ibsrv.net/gimg/www.off...6b4f247d8d.jpg
This is how it was done and it was not good..
https://cimg6.ibsrv.net/gimg/www.off...ebb71ee2da.jpg
But when i put it this way then it is ok