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2 - Yes to both. Rings are starting to seat which increases compression, and thus power. If there is anything "tight" in the entire engine it would be gears. Possibly starter, also transmission. Those could also rob some power.
3 - CSC recommends a first oil change at 200 miles, so fairly close. That was the interval I stuck with on my bikes. Then 1k miles.
4. Magnetic drain plugs do trap some ferrous metal, but a lot of it tends to be caught by the centrifugal oil spinner, or remains suspended in the oil and will never come near the magnet. Basically, they do help, but they only do so much.
5. Yes, it does lol.
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