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Author Topic: 1981 Honda CB650z (RC03) engine change. What will fit?  (Read 1185 times)

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Offline boiev

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1981 Honda CB650z (RC03) engine change. What will fit?
« on: June 27, 2017, 09:25:07 AM »
Hi, my cb650z's engine is dead - camshaft has damaged head around it. New engine or parts for 81s year not possible to find in my country.  I need new one engine because repairing of original isn't possible and cost to expensive.  Please tell me: what engine will fit to my frame (RC03 model)??
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Offline cb650

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Re: 1981 Honda CB650z (RC03) engine change. What will fit?
« Reply #1 on: June 27, 2017, 12:06:24 PM »
Any sohc 650 will fit.   Biggest diff it the head/carb spacing.  What carbs you have?   should be cv's but have seen a 81 few Z's with the older style head/carbs.   and after almost 40 years dont know what has been done to the bikes.    One thing to be aware of also Germany got a lopo version if the 650.   Was limited to 50hp by the cam.
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Offline SOHC4 Cafe Racer Fan

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Re: 1981 Honda CB650z (RC03) engine change. What will fit?
« Reply #2 on: June 27, 2017, 02:15:16 PM »
1981 and 1982 CB650 engines are pretty much identical.

1979 and 1980 CB650 engines will fit but the head is different -- different intake spacing and carburetors.
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Offline boiev

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Re: 1981 Honda CB650z (RC03) engine change. What will fit?
« Reply #3 on: July 14, 2017, 05:27:27 AM »
thank you! i found my part are restorable. so theres no question more.
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