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Hi and thank you for your question. I am happy to help you diagnose and repair your SR210.
Since you have swapped some components already and it did not help, we need to look elsewhere. At this point, I would suggest checking the oil to make sure it isn't over full or has water in it, then pull the spark plugs and inspect them. Also, lets do a compression test while we have the spark plugs out too.
Let me know what the plugs look like and exact to the pound what each cylinder has for compression. Make sure you keep the spark plugs in order of removal front to back so if a cylinder has a problem, you will know which one it came out of.
Fair enough. I will opt out and let you try your luck with another expert. I don't want to argue with you or take numerous posts to get all the information you have and what you have already tried. That is wasting time for both of us.