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Author Topic: Max horsepower for CB-1 NC27? (no engine swap)  (Read 250 times)
ROADSTAR
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« on: June 16, 2019, 10:35:39 PM »

Hi all.

I'm currently considering getting a CB-1 as a temporary bike while getting my project bikes fixed.

I have some questions with regards to possible future upgrades (specifically, max hp tolerable for the engine).

So far, I've learned that there was a 485cc kit available before. Currently, only the 444cc kit exists (3mm overbore).

In the CB-1 group on Facebook, the fastest/most powerful CB-1 I've come across was from a race bike in Japan which pushes 65whp NA (mods were not specified).

So, my question is, what is the maximum horsepower achievable with the CB-1 engine? Has anyone actually pushed for it?

Say, 485cc kit 13:1 CR, 32mm FCR carbs, 4-1 exhaust, headwork, NC23/29 cams. Could this specs possibly push the engine to 80-90hp?

Thank you and best regards,

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1975 川崎 750RS ZⅡ「746cc」
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