SOHC.co.uk Forums > CB750

Vent Pipe Smoking

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K2-K6:
The choke function on older carbs is quite crude and makes the mixture much richer than normal running requires.....too much of running on choke when not needed and wet fuel doesn't all get burnt but a proportion of it leaks past the top piston rings and ends up in the oil.

As Bryan says, it should be fine but you need to change the oil so that it protects the bearings and other components as required .

If you test the compression and compare to spec, you'll probably find that it's all ok so it's nothing to worry about unless other things indicate otherwise.

These motors live on fresh oil, so don't avoid a change if required.....likewise they don't give much trouble if you pay attention to oil condition.

Garryk:
K2-K6
Thanks for the info,respects
Oil change was done yesterday.put some classic 20/50 into her,new oil filter and cleaned oil screen in the sump,so she's ready for the charity rideout tomorrow.
Cheerssssssssssssss
Garrk

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