SOHC.co.uk Forums > CB350/400

Starting to wonder about this bike.....

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Oddjob:
How much castor oil to a tank Nigel? Does it make the bike regular?

K2-K6:

--- Quote from: Oddjob on April 04, 2023, 02:33:18 PM ---How much castor oil to a tank Nigel? Does it make the bike regular?

--- End quote ---

10ml per litre for dosing with oil.

As for regular, extremely effective, as the actress said to the doctor  ;D

Scottish Badger:
An update.
Leaking float needle seats confirmed on carbs 1 & 2.  I drained both carbs, removed the fuel pipe from the tank (leaving the other two carbs full) and used airline to blow through carbs 1 & 2 in both directions! Reconnected fuel line, fuel tap on, no flooding. Great, I thought!  Rode the bike, within 2 miles it was flooding again, this time on carb 2 only! Took it back home and virtually threw it into the workshop and went for a beer!
A few days later, I removed the carbs completely yet again.... I swear, these carbs should be able to remove themselves by now! After checking for any dirt in the in-line filter and carb float chambers (none), I set up a heath-robinson test rig with an air supply metered at 2psi and used leak detection fluid on the float valves to check for leaks, deliberately opening and closing them to try and provoke something.
I wasn't completely happy with any of them, so I trawled through all the carb kits I've bought (a cheap set from ebay, then another set from an allegedly reputable source after deciding the cheap ebay ones were crap quality!) and sat with some metal polish and a very small piece of tubing that just fitted onto the end of the needles and polished the needles to the seats. I've ended up using the UK-sourced brass with a set of original needles, I've also dropped the float heights by 1mm as well. Whilst it was up on the bike lift, I replaced the standard exhaust with a nice Delkevic system.
Yesterday, I took the bike out for a run and I'm relieved to say the carbs behaved perfectly, with no issues. However.... it seems I now need to replace the clutch, as despite adjustment being correct, it still slips slightly on hard acceleration going up through the gears. I also have a squeaking front brake, I suspect the caliper is binding very slightly, so that's another thing to add to the list......
On a positive note, I feel like I'm finally getting somewhere with it now, and the new Delkevic exhaust sounds just lovely under full throttle.

Johnny4428:
Sounds familiar on these bikes you get one thing sorted and another issue appears! The squeaky brake issue can sometimes be sorted just by a slight chamfer on the sharp edges of the pads. Good luck with it!

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