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How hot should it get?

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Greebo:
Mark

You could also use Motul 5100 10w50 semi Synth' [£30.00 quid on ebay],

I use it due to a recommendation by the guy who specialisers in re-building these engines, & I know these engines run hot even without a fairing, but you are definitely doing the right thing by fitting an oil cooler.

MarkCR750:
I changed the oil yesterday, Halfords 10/40 semi synthetic motorcycle oil £21 5 litres not sure how good it is but definitely better than the oils the bike was designed to run on, I wonder who actually makes it?, the XJR got treated to 4 litres of castrol power 1 at £38, I had a look at the plugs on mine earlier, dark at the outer diameter and light tan electrode so pretty much perfect , good that yours is a lot nearer to where you want it.

Johnwebley:
interesting subject,

  I remember when they used these motors (early 70's) for endurance racing,

  doing the 24hr Bol d'or,

 these bikes needed an oil cooler,24 hrs (if your lucky) flat out racing.

 are you guys going to ride that hard ? surely  in the UK,with an average temp of high teens,the oil will be comfortable,
also,will you fit a thermostat so the cooler only works when needed,?

I personally think over cooling the oil could do more harrm than good,

Greebo:

--- Quote from: Johnwebley on May 09, 2016, 10:36:04 AM ---interesting subject,

  I remember when they used these motors (early 70's) for endurance racing,

  doing the 24hr Bol d'or,

 these bikes needed an oil cooler,24 hrs (if your lucky) flat out racing.

 are you guys going to ride that hard ? surely  in the UK,with an average temp of high teens,the oil will be comfortable,
also,will you fit a thermostat so the cooler only works when needed,?

I personally think over cooling the oil could do more harrm than good,

--- End quote ---

#
Yes but after the race [thats if they made it the end] the Engines would be completely F*cked.

Better to be on the safe side ... 8)

totty:
I agree with the over cooling comment. According to a specialist oil blender I used to know it's definitely not the colder the better, 90 to 110 mineral, 90 to 130 with some synthetics is the range you want it to be in.

Personally I wouldn't fit a cooler without confirming one was required, and even then I'd use a thermostat.

I monitored the temps on my monkeybike, it can exceed 120 in extreme circumstances like sitting on traffic after running flat out on a 27 degree day, but it runs at 85 in normal conditions. (I'm not sure why I never monitored it on my 550, but I suspect it runs cooler)

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