SOHC.co.uk Forums > CB750

How hot should it get?

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MarkCR750:
I have got a full fairing fitted and down pipes lagged, the tappet covers get too hot to touch after say 10 miles, is this normal?, I intend to fit an oil cooler but can't resist riding at the moment , I think we've got a probe thermometer somewhere in the darkest reaches of the kitchen cupboards, I was thinking of checking the oil temperature in the tank, does anyone know what the max acceptable oil temperature is for the 750 SOHC ?, cheers Mark.

Green1:
I don't think I can touch the tappet covers when the bike is warmed up.
Air cooled engines tend to ping when there getting hot as you have a fairing I would run it on 20w50 and change it often probably no more than every 2000miles
In extreme cases the oil will smell burnt

MarkCR750:
Thanks, I'm a bit paranoid about cooking the engine with that fairing fitted, I guess they run fine it places like Nevada with high ambient temperatures so I'm probably worrying about it too much, I changed the oil earlier today and what came out seemed fine, I'll get an oil cooler sorted soon.

Bryanj:
Should be 1500 miles on any oil max not 2000

K2-K6:
Don't think you could hold bare skin on any aircooled motor when up to normal operating temp, certainly around the cylinder head area.

Oil temp in degree C should be normal operation at 90, within an upper advised limit of 110 as I understand it.

It's quite possible that you're not running at elevated temp but if you want to measure it then put the probe in oil tank with it still running after getting it up to normal road use operating temp.

These have an oil cooler of sorts as the oil tank itself acts in this way albeit more limited than a cooler matrix.

Oil condition is everything when hot so keeping it fresh with no operational fuel dilution is the right way to go about running it in current configuration.

Changing the oil viscosity will give maybe nil advantage in these circumstances, you'd normally go up in viscosity if the bearing tolerances are greater than they should be i.e. too worn to maintain oil pressure. You may even get the opposite happen to what you want in that operating drag from increased viscosity marginally increases the temperature the engine runs at.

Towards an elevated \ excess operating temp,  you may get better protection by considered use of a synthetic based oil.

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