SOHC.co.uk Forums > CB750

CAN'T FIND NEUTRAL WHEN HOT

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StevieWonder:
I'm using 10W40 Rock oil, Gamma. It a mineral oil that are apparently better for 'running in' an engine after rebuild - as my top end was.

pewe:
Finding neutral when engine is hot is one way for me to  verify the oil to be OK for the engine.

All 10W-40 oils I have used cause very hard an mechanical gear shifting. I used those for break in only.

CB750 should use 20W-50. I think that 10W-40 was for colder temperature, max 15C.

I have tested Motul 5100 15W-50 semi. Better than Motul 20W-50 mineral and much better gearbox feeling than Motul 10W-40 mineral. Castrol 10W-40 mineral also very hard gearbox.

Motul 7100 10W-50, even better.
Red Line 20W-50, best so far.
This in my K6.

Spectro Heavy Duty 20W-50 mineral caused sticky clutch. Out with 1L and in with Q8 SBK racing 10W-50 (cheap synth) made it really good. Gears shift very smooth!
In my K2.

Both Red Line and Spectro have high amounts of zinc and phosporous.

I have ordered Eurol Harley Davidson 20W-50 oil that is very cheap. It cannot be high quality synth as Motul 7100/300 or Red Line (esthers) but well worth to be tested. The gearbox when hit will tell! ;)

I have done my own semi by mixing 2 Spectro 20W-50 mineral, 2 SBK racing and 1 Red Line 20W-60 to be used in My K2 stock spec.

The latter for my K6 summer 2018 where we had over 30C during a long period of time. I ordered a box of 20W-60 to my hotter running K6 with 1000cc Billet block.

I'm convinced that CB750 run well on V-Twin 20W-50 JASO MA oils.

Nurse Julie:
In the UK 10w 40 or 15w 40 mineral or semi is perfectly adequate. We don't have the high temperatures you have Pewe so don't need anything ending in 50. 10W-40 is for Temps up to 40°. Thats plenty high enough for us in UK. Any 50 will be like treacle trying to go around the engine.

pewe:
Then you'll get the harder gearbox, problems finding neutral while bike is standing still.
Check the other forum where Hondaman explains 10W-40 history for CB750, why it is mentioned on the sticker.

I'm sure you have higher temp than I have in Sweden ;)
Yesterday was OK riding weather!

The old UK bikes runs with straight 50, right?

Bryanj:
Only ever used 10 40 in dealerships never 20 50 and no problems except the known fact of neutral, even Honda said select neutral as stopping not when stopped

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