Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: gtmdriver on April 30, 2018, 04:50:59 PM
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I have a CB350F with a tired engine. There is a lot of blowby and crankcase pressurisation.
I want to rebuild the 350 engine but here in the UK spares are rare and it make take some time.
To avoid the bike being off the road I would like to temporarily fit the complete engine from a CB400F.
Apart from the clutch operation are there any other differences?
My bike has the full 4 pipe system. Will that couple up to the engine OK?
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I have both the 350 and 400, as you say the clutch operation is different but as mainframes are the same, I can’t see why you can’t couple the cable in the normal way- you might have a problem with cable lengths though. The 400 clutch cover doesn’t fit the 350 cases but you don’t need to change any of that. The gearchange is different and 6 speed on the 400. Not near my bikes till tomorrow but I have a feeling the 350 lever works t’other way - I’ll check. As the stroke length is the same on both and only the bores are different, I would guess that the pipes would fit without drama.
Can’t think of any other problems you might meet.
Ian
Just spotted that was post 333 for me - spooky, that’s the model number of the CB350F - Off to buy a lottery ticket🤓
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I was wrong (again) the gear-lever has a linkage on the 400 but straight on the shaft on the 350, so that will not be a problem. Difficult to measure accurately but the exhaust ports are close to the same height from the lower frame rails on both bikes - go for it!
Ian
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Thanks for that.
On the US site they talk about footrests kickstarter and brake lever too but nothing insurmountable.
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Yes the 400 footrests are different but you are using the 350 pegs so if you fit the 350 gear-lever to the 400 box, I can’t see a problem. The only issue might be that your right hand 350 footpeg might be too close to the 400 clutch cover - might need a spacer and longer through-bolt. Kick start shouldn’t be a problem as your footrest is in front of it rather than behind. Brake lever is already longer to match up with the footrest.
Ian