How big for starter battery?

Quote:

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Originally Posted by Maca49

Don't forget to change to plugs! I got a new motor doing that last week, I also run it, a Johnson big looper 130 HP V4, on premium gas.

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Does it have enough compression to warrant running premium?

Quote:

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Originally Posted by Maca49

Don't forget to change to plugs! I got a new motor doing that last week, I also run it, a Johnson big looper 130 HP V4, on premium gas.

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It got new plugs in November. The compression ranges from 100-125 psi, not great but not bad for an older motor either.