SOHC.co.uk Forums > SOHC Singles & Twins
CB360 K0 Not well
nairb:
--- Quote from: Oddjob on August 27, 2023, 05:26:08 PM ---If ordering points, I'd strongly advise buying original, not copies. Copies just don't seem to work as well these days.
--- End quote ---
Yup. I do this with Brake cables and clutch cables as well. Altho if DS stock an alternative, are they OK?.
Anyway..... its now being prodded to see what's wrong.
Oddjob:
If the alternatives all there is then I suppose you have to buy them. Try and find genuine first though. Should still be some around. Ask on site and see if anyone has some stored away.
nairb:
An update. Points off. Looks ok. Advance unit out and seems to be working. It's free to advance and spring back.
Compression tested. Cold engine, throttle fully open, I get about 150 (psi?) per cylinder. So they seem ok.
All back together and points set up as manual says. New spark plugs.
NO improvement. Still won't rev and in holding back. LH plug is very sooty and black.
Wonder if it's the condenser/coil.
More investigation required...........
cbxman:
nairb,
Have you checked the diaphragms? Similar problem back in the day with my CB250s
Sooty plug, I would having those carbs apart.
Good Luck. Keep us briefed
Jerry
K2-K6:
--- Quote from: cbxman on September 08, 2023, 08:50:11 AM ---nairb,
Have you checked the diaphragms? Similar problem back in the day with my CB250s
Sooty plug, I would having those carbs apart.
Good Luck. Keep us briefed
Jerry
--- End quote ---
Well spotted, it does sound like that in characteristic and worthwhile checking.
If diaphragm is compromised it leaves the airline down (or below optimum height) with vacuum going really high underneath the slide it pulls fuel through the jet way in excess of target to make it like it's running on choke for that carb.
Obscure note, I use exactly this train to tune SU carbs on modified engine, thicker oil viscosity in air damper tube to cause the slide to stay below target and force rich mixture for acceleration while not having to change the main jet from optimum. Quite a powerful effect overall.
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