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Post by ledtoe on May 15, 2022 20:16:12 GMT
Hi I’ve just picked up what I was told is a CB250n. The V5 says Honda but no model. The engine is a 250 but the frame number starts cb400. It’s registered as a 79. Is she a bitsa or did the 250’s have the frame number same as the 400? The V5 numbers do match what’s on the bike. TIA!
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Post by comstar on May 15, 2022 20:23:57 GMT
Welcome to the forum.
You have a 250 engine in a 400.
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Post by ledtoe on May 15, 2022 20:35:42 GMT
Hi Thanks for the welcome and thanks for quick reply! Do you know what I would need to put a 400 engine back in? Is the main loom the same? Much of the electrics different? I’m not new to bike’s so as much info as poss would be very handy. Thanks again!
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Post by johnfcbn44dx on May 15, 2022 21:29:51 GMT
Hi Thanks for the welcome and thanks for quick reply! Do you know what I would need to put a 400 engine back in? Is the main loom the same? Much of the electrics different? I’m not new to bike’s so as much info as poss would be very handy. Thanks again! Engine CDI (hitachi rather than ND) Upper engine mounting brackets, engine is about 10mm taller. Carbs (unless you can tweek the 250 ones) The airbox is different... CB250N Sprockets are 15T / 41T CB400N sprockets are 16/36. 79 used a 530 chain, if not using the existing chain, consider changing to a 520 chain as the 1981 model. 250 chain is two links longer than the 400 chain. Is it the twin disc 400 brakes you have? The 250 ones struggle with 250 velocity two up. (plenty options). Frame and engine numbers CB###N - 201#### N 78/79, 210#### NA 1980, 220#### NB 1981, 230#### NC 82/83? |
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Post by ledtoe on May 15, 2022 22:14:51 GMT
Hi Thanks for the welcome and thanks for quick reply! Do you know what I would need to put a 400 engine back in? Is the main loom the same? Much of the electrics different? I’m not new to bike’s so as much info as poss would be very handy. Thanks again! Engine CDI (hitachi rather than ND) Upper engine mounting brackets, engine is about 10mm taller. Carbs (unless you can tweek the 250 ones) The airbox is different... CB250N Sprockets are 15T / 41T CB400N sprockets are 16/36. 79 used a 530 chain, if not using the existing chain, consider changing to a 520 chain as the 1981 model. 250 chain is two links longer than the 400 chain. Is it the twin disc 400 brakes you have? The 250 ones struggle with 250 velocity two up. (plenty options). Frame and engine numbers CB###N - 201#### N 78/79, 210#### NA 1980, 220#### NB 1981, 230#### NC 82/83? Hi Thanks for the info. It only has a single disc at the moment. Not sure why so much of it has been changed. Will keep me busy putting it right. Are you all in the UK? Asking as sometimes the info is different for parts/models around the world. Thanks again! |
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Post by andy1kenobe on May 15, 2022 22:29:49 GMT
Hi, welcome along. You'll get plenty of help and advice here. Members here are very knowledgeable about these bikes. You've come to the right place.
Most of us are from the UK but there are some from further afield. Any many have other makes/models of bikes too. Post a few pics of yours, we love a photo here!
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Post by ledtoe on May 15, 2022 22:52:59 GMT
Hi, welcome along. You'll get plenty of help and advice here. Members here are very knowledgeable about these bikes. You've come to the right place. Most of us are from the UK but there are some from further afield. Any many have other makes/models of bikes too. Post a few pics of yours, we love a photo here! Hi Thanks for the welcome. Will take a few at some point. It needs a full restoration so not much to look at for now. I have a cb-1 that needs finishing first so will give me chance to find some parts. Thanks all for the help. |
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Post by johnfcbn44dx on May 16, 2022 7:29:21 GMT
Engine CDI (hitachi rather than ND) Upper engine mounting brackets, engine is about 10mm taller. Carbs (unless you can tweek the 250 ones) The airbox is different... CB250N Sprockets are 15T / 41T CB400N sprockets are 16/36. 79 used a 530 chain, if not using the existing chain, consider changing to a 520 chain as the 1981 model. 250 chain is two links longer than the 400 chain. Is it the twin disc 400 brakes you have? The 250 ones struggle with 250 velocity two up. (plenty options). Frame and engine numbers CB###N - 201#### N 78/79, 210#### NA 1980, 220#### NB 1981, 230#### NC 82/83? Hi Thanks for the info. It only has a single disc at the moment. Not sure why so much of it has been changed. Will keep me busy putting it right. Are you all in the UK? Asking as sometimes the info is different for parts/models around the world. Thanks again! Yes, UK north of Edinburgh by sailing boat The CB400T 1981 USA Hawk had a single disc, but it was like the one on a CB900F2B, with a 2 x 30mm caliper......Rather than the Tokico single pot on the UK (and most 250 ) models.... |
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Post by buster on May 16, 2022 8:20:39 GMT
hi and welcome to the forum, as andy said a few pics of your bike will help with identifying which parts are which. its quite possible that it may already have a 400 airbox fitted for example. I'v got the earlier single disc, single pot caliper on my 400 thing, its coupled up with a (black) venhill brake hose and that does make it into a brake but if your used to modern brakes it might come as a shock.
I'v been trying for a while now to come up with a cheaper more reliable system for the 400 ignition, I emailed a german firm about a replacement cdi and I'm just waiting to hear back from them.
lots of members on here, from all over the world, your in the right place for knowledge on the differences on international models and what parts fit what
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