Will a Nc23 engine from a later nc29 work on earlier bike

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Vengy1
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Will a Nc23 engine from a later nc29 work on earlier bike

Post by Vengy1 » Tue Jun 11, 2019 6:16 pm

I’ve got a later nc29 engine not sure of exact year and a cbr400rr hurricane which has destroyed its engine. Will the later engine work on the carbs and electrics of the earlier bike ? Any help is greatly appreciated 👍🏾

sa.racing
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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by sa.racing » Wed Jun 12, 2019 11:20 am

Think the engine mounts are different if memory serves me correct,

best bet would be to sell the NC29 as there still worth a few quid and pick yourself up an NC23 motor (sure there's one for sale in the for sale section on here)

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by Vengy1 » Wed Jun 12, 2019 5:05 pm

Thanks for the reply 👍🏾 Found the engine no. Reference in the Haynes manual and it would appear I have another j series engine which should just bolt straight in and not a nc29 engine. The silver cases instead of gold put me off as I didn’t have a engine number reference. Thanks for the help tho

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by sa.racing » Wed Jun 12, 2019 5:28 pm

No worries mate,

Easiest way to tell is the NC23 engines have fins on the crank cases where as the NC29 engines have a smooth crank case.

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by Vengy1 » Wed Jun 12, 2019 5:36 pm

The cases r also finned 👍🏾 All the mounts line up and the engines just been cleaned for putting in but the integrity of said engine is unknown as of yet so fingers crossed 🤞🏾 lol it turns over with compression and its got oil in it that isn’t emulsified which means nothing lol

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by CB1pod70 » Thu Jun 13, 2019 10:44 am

sa.racing wrote:
Wed Jun 12, 2019 5:28 pm
No worries mate,

Easiest way to tell is the NC23 engines have fins on the crank cases where as the NC29 engines have a smooth crank case.
Also the NC23 has a water outlet on the back of the cylinders going to the water pump where as the NC 29 has the outlet on the front of the cylinders

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by Vengy1 » Fri Jun 14, 2019 8:08 am

The engine is in 👍🏾 Thanks to everyone who replied it was appreciated greatly ! The key has been put away ‘safe’ 🤬 is there a way of bridging the pins in the ignition connector to get the ignition on please ? As I don’t want to ruin the ignition as it’s original and the key will turn up the second I screwdriver it 😂👍🏾 Thanks Alex

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by CB1pod70 » Fri Jun 14, 2019 10:40 am

If you disconnect the ignition barrel you you can make up a bridging wire to sit in the connector from the loom. You need to bridge the red & red/black wires. Make sure you use wire that is the same gauge or thicker than the red wire and just use some crimp electrical connectors from Halfords or the like.

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Re: Will a Nc23 engine from a later nc29 work on earlier bike

Post by Vengy1 » Fri Jun 14, 2019 11:10 am

Thanks for the reply that’s a massive help and very appreciated 👍🏾


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