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Super Moderator
Join Date: Feb 2000
Location: Naperville, IL USA
Posts: 14,987
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9.8:1 with 93 octane is okay, but close. Any less octane or any more compression will not be okay on hot days. Not exact science here, but this is a fairly accepted range.
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Chris
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1996 993 RS Replica
2023 KTM 890 Adventure R
1971 Norton 750 Commando
Alcon Brake Kits
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