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Messages - cbradley400/4
1
« on: September 07, 2025, 08:04:16 PM »
My Superdream is the 400NA model, lots of later changes to the front suspension & twin brake calipers. Also some of the later Reverse Comstar wheels don't fit earlier models iirc.
Yes thanks, I seem to recall those changes back in the day when the bikes were current.
2
« on: September 07, 2025, 08:02:37 PM »
Another point has occurred to me and I wonder if anyone can answer this please?
The V5 has the 250 frame number as the vin but still the 250 engine number.
I know the frame number cannot be changed and must remain with the registration number but how easy is it to change the engine number if the engine is changed to a 400?
My understanding is the bike has not yet been registered as a historic vehicle so assuming you can change the engine to the 400, the additional road tax would have to be paid to put the bike on the road and of course it would also need to be MOT'd and insured.
3
« on: September 07, 2025, 06:15:30 PM »
Thank you to all repliers : that is all most helpful 
4
« on: September 07, 2025, 08:00:17 AM »
Does anyone know how easy (or difficult) this is please?
I have the chance to buy a 250 with a 400 engine and carbs but am wondering whether I need anything else such as the loom and other electrics?
5
« on: July 23, 2025, 02:58:34 PM »
I hope I'm OK to do this...here is the link : https://www.ebay.co.uk/itm/357321238036Discounted price to forum members. May consider a part ex for an interesting project.
6
« on: August 23, 2024, 12:56:07 PM »
Thank you...
I think I'll just have to live with this-the bike has always done it.
My mate did fit new O rings and sealed them but it hasn't worked clearly. This was done a few years ago. It's very irritating as I've owned over 100 Jap bikes and they rarely leak oil in my experience. I did use to own a Kawasaki W650 which looks more like a Triumph and that bike actually did leak oil just like the real thing!!
7
« on: August 22, 2024, 09:44:21 PM »
I've just read Laverda Dave's rebuild thread and you have my total sympathy regarding the engine trouble.
In fact my 400/4 which was the reason I originally joined this forum suffered from engine trouble and had to be re-bored. 4 times the number of components in many instances and very expensive IIRC. Luckily I have a good friend who's a very competent bike and car mechanic and he did the work for me without any issues. I seem to recall the re-bore was done by Grampian Motors.
Those engine problems you encountered sound like an absolute nightmare and you did very well to persevere and complete the bike after all those problems.
I've had running problems with my 750 Ducati Monster ever since I bought it 4 years ago and I know how expensive and frustrating these problem bikes can be.
8
« on: August 22, 2024, 05:21:38 PM »
Thanks for replies.....
Yes they are very underrated and great very light weight and unintimidating bikes-perfect for an every day hack or despatching back in the day-well as long as the distances are not too great.
I always think they could do with a bit more urge and have always admired the 500 conversions but that would be way above my skill set-Allen Millyard I most definitely am not!
As to the tank dimensions I've done my best but can't guarantee the accuracy : A = about 45mm, B = about 35mm, C = about 25mm, D = about 20mm. The others I can't do at the moment as the seat is a bit of a pain to remove as you will know but if they are still needed let me know and when I have time I'll remove the seat and try again.
Mine has always suffered with most Un Honda like oil leaks presumably from the head and I'm going to search on this forum but I don't suppose there are any easy answers to this problem?
Another problem I had with mine in the past was corrosion of the frame which only became apparent when the kick start lever began to foul the right footrest hanger. My mate had to investigate and weld up the frame behing IIRC where it bolts to the frame.
9
« on: August 20, 2024, 08:00:51 PM »
I used to be a member of this forum back in 2008 when I owned a 400/4.
For many years I've been a fan of the CB250 RS and have owned quite s few of these .
My current one is a 1981 A model which I've owned for the last 10 years.
I bought it as an abandoned cafe racer conversion and returned it to standard.
I cover about 1000 miles a year on it as i have other bikes too.
It's been pretty reliable.
I'm just wondering how much interest there is on this forum for these models?
10
« on: October 09, 2009, 07:30:45 PM »
Many thanks.
11
« on: October 08, 2009, 10:03:56 PM »
I'm not sure.I got a spare master cylinder but haven't fitted it yet as the leak is intermittent and it stopped again!
The bike's been off the road recently as it's burning oil at 5000+ rpm and just won't run right.The points and ignition have been checked as have the carbs.It needs a compression test and the head lifting as i'm told it's likely to be rings.There's 40K + miles on the clock.Any further views would be greatly appreciated.
Martin
12
« on: October 08, 2009, 09:57:24 PM »
Sounds like they are the same as the RD 400 then.Thanks.I'll get the wheel out and give it a go now then.
Martin
13
« on: October 05, 2009, 06:51:41 PM »
Many thanks,belatedly.
14
« on: October 05, 2009, 06:48:48 PM »
Can anyone advise how straightforward a job this is please.My bike is coming up for MOT and i want to sort this out before i get a fail slip?
15
« on: December 27, 2008, 10:12:43 PM »
Thanks,i'll check that out.
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