Author Topic: what about the 250s/350s/360s?  (Read 5966 times)

Offline gripperod

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what about the 250s/350s/360s?
« on: January 09, 2009, 12:07:46 PM »
I know this will make me appear particularly sad, but the site's title is SOHC not Honda 4 ;D. I have just bought a CL360 engine as the basis or a classic off roader because I want to replace my BSA B40 (I have never really got to grips with imperial thread and spanner sizes, or indeed the Exxon Valdez size oil slicks that appear under the bike :-[) )And as usual I am starting with a box of bits and know nothing about this model, does anybody else on the forum own one of these more desirable SOHC twins  ;) whos brain I can pick? And any interest in having a "twins" section?

cheers

bp

Offline matthewmosse

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Re: what about the 250s/350s/360s?
« Reply #1 on: January 09, 2009, 08:55:23 PM »
Sounds interesting to me, I've got a cb250 sohc, but I suspect that if things open up too much we'll run out of capacity............
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline dave400

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Re: what about the 250s/350s/360s?
« Reply #2 on: January 09, 2009, 09:54:41 PM »
I also have a 450 Honda twin (Superdream) and it

Offline Dave M

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Re: what about the 250s/350s/360s?
« Reply #3 on: January 10, 2009, 12:53:26 AM »
The CB250 and 360 G5 engines were the follow up to the K series engines.

The main criticism of the K engines was that you could not remove the cylinder head without removing the engine from the frame. Which, from experience, was true.

The G5 engines had a split head where the rocker arms were in a separate part which bolted onto the head over the valves and the springs. This meant that it could be removed from the head thus giving enough space to allow the head to be removed from the engine whilst still in the frame.

Great in principle, but the top part was attached to the head with tiny bolts which people tended to overtighten and strip the threads leading to huge oil leaks. Which again, from experience, was true.

If the engine hasn't been apart all should be well but if it has been dismantled before watch out for oil leaks from the head which can be expensive and difficult to fix.
Dave
Melbourne.

Offline Bryanj

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Re: what about the 250s/350s/360s?
« Reply #4 on: January 10, 2009, 09:52:12 AM »
Other big problem was nobody cleaned out the centrifugal oil filter on the RH end of crank inside the clutch cover as the labour time was high and customers wouldnt pay.

Then it blocks and starves the cam and it siezes which of course is all Honda's fault and it gets an "unreliable" image.

Worked on lots and found em great if serviced right BUT ALWAYS let em' warm up before riding/thrashing as if you dont you will shatter piston rings----holds true for the "K" model as well

Offline gripperod

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Re: what about the 250s/350s/360s?
« Reply #5 on: January 12, 2009, 10:19:14 AM »
Cheers Chaps, there is clearly some expertise around on the site, I will be back with some daft questions presently........................................................................................

Offline JonnyB

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Re: what about the 250s/350s/360s?
« Reply #6 on: January 14, 2009, 02:29:27 PM »
I'm taking delivery (hopefully) of and old CB250 an the end of the month, so there will be questions asked ;)
Regards and Ride Safe!!

Daily Ride - BMW K1200GT
Summer Fun - Naked K100
Current Project - GS500E
Basket Case -  K100/1200 hybrid 
Lawnmower - 1965 Webb Delux 14" Close Cut Battery Electric.

John

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Offline SteveD CB500K0

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Re: what about the 250s/350s/360s?
« Reply #7 on: January 14, 2009, 02:31:46 PM »
How old?

I like the K3/K4s

I had too much trouble with G5s in my University years...
2022 Tiger Sport 660
1971 CB500K0

Offline JonnyB

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Re: what about the 250s/350s/360s?
« Reply #8 on: January 14, 2009, 02:52:53 PM »
Not sure, it's pre superdream and OHC, I'm taking it of the hands of a mate that's discovered "Cars and Girls"
Regards and Ride Safe!!

Daily Ride - BMW K1200GT
Summer Fun - Naked K100
Current Project - GS500E
Basket Case -  K100/1200 hybrid 
Lawnmower - 1965 Webb Delux 14" Close Cut Battery Electric.

John

https://batchscan.co.uk/

Offline matthewmosse

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Re: what about the 250s/350s/360s?
« Reply #9 on: January 14, 2009, 03:54:00 PM »
Might be of interest to owners of the smaller ohc bikes here, I've a cb125 cable operated brake caliper in my spares pile, plus a superdream engine and miscilanious engine parts. Also some pre superdream cb250 sidepannels, and some superdream ones possibly lurking around..............
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline gripperod

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Re: what about the 250s/350s/360s?
« Reply #10 on: January 14, 2009, 06:35:29 PM »
I would be interested in the side panels if they are G5, rather than dream, how much???????? ;D

Offline matthewmosse

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Re: what about the 250s/350s/360s?
« Reply #11 on: January 14, 2009, 06:45:02 PM »
I'll see if they have all their lugs, get some photo's etc. They were part of a job lot of stuff when I bought my first cb550 baskett case. I'm not wanting a lot for them. Make me an offer if the pictures confirm they are what I think they are :)
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline matthewmosse

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Re: what about the 250s/350s/360s?
« Reply #12 on: January 15, 2009, 11:46:45 PM »
found one so far, luggs are good, it's pre superdream shape but has thick hammerite which will be a git to remove, it's so thick it has chipped, I'll try to get a look for others over the weekend
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline matthewmosse

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Re: what about the 250s/350s/360s?
« Reply #13 on: February 17, 2009, 11:08:38 PM »
Not been too lucky on the finding pannels front, did how ever spot a very sorry cb250 or similar of very pre superdream age rotting quietly at a scrappies, it's disk braked and of similar caliper desighn to a cb500/550. It looks to be fairly complete but very well past it's best, having suffered a small fire by the battery, and been robbed of tank plus a few other bits and it's clocks are a bit beat up, lots of rust too. However, if someone here needs bits I might be able to put in an offer for them as these bikes must be getting thin on the ground. Just thought I'd mention it in case there's something someone needs. I hate to see stuff going to waste and come summer it'll be burried in nettles again or end up being smelted........... :'(
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

 

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