SOHC.co.uk Forums > CB750
Carbs Install
Oddjob:
What kind of tap is fitted Martin? The double outlet with the small bowl underneath?
K2-K6:
"One other significant finding. The bike had just had an oil change. When I checked the oil, the level was fine and it was clean. I checked it again after my run and it is now half an inch over the upper line, with a slight emulsion and an odour not quite of pure oil. It seems thinner, but it was hot. There was dripping from the end of the valve cover breather pipe, which seemed almost clear, not really oily. Could this be fuel contaminating the oil? What could cause this? I did forget to turn the fuel tap off when I filled the tank and paid. Maybe 5mins at most."
Possible the fuel has diluted it, smell it to see and compare with fresh oil in can, smell wise. Unburnt petrol is easily picked up in aroma.
See also my post on idle jets, if run too rich there it'll soon wash some down the bores to give dilution too.
K2-K6:
For oil level on the 750, you can check it running as that's the true system level. If it shifts significantly after being left off overnight that would confirm "sumping" and need attention to oil pump seals. Not difficult on these as it's just sump off to get to the pump.
Dry sump system are usually checked this way generally.
Martin6:
--- Quote from: Oddjob on April 03, 2023, 03:21:44 PM ---What kind of tap is fitted Martin? The double outlet with the small bowl underneath?
--- End quote ---
Hi, It is a single outlet pipe. Looks original.
Martin6:
K2-K6, thanks.
I will take the carbs off and try again. I think i was too lazy first time round, not dismantling the upper part of the carbs. I've also bought David Silver's carb refurbish kits. I will compare with the current hardware in the carbs. I'd prefer to keep the original needles and jets, but after 46 years, I guess there's no guarantee they're original anyway. At 40,000 miles, if they are original, they're possibly due a change, but I won't rush into that if the existing parts look good.
After a day and a bit, there's no sign of the oil level dropping. May be too early to be certain. My Commando takes a couple of weeks. It smells oily. It seems thin, but I'm used to the Norton's 20W50! I'll check it against the 10W40 I bought today. I got a gasket set, so I can do the sump and look at the oil pump, if it starts to sump. I'll also now have a gasket for the cam chain tensioner, to check if that's actually moving.
Appreciate your input.
Martin
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