SAE 30

[djh66]

My mate has bought some Briggs & Stratton SAE 30 4 stroke engine oil, is this ok for the PX gearbox?

[djh66]

It's a newly built Harry Barlow 204 engine, Harry built it about 3 months ago, it's only now it's been fitted and fired up, there is a clutch problem in it drags no matter how much it's adjusted, I've removed the clutch (cosa type) but cant find whats wrong, I was wondering if its the oil?

[Yanker]

My mate has bought some Briggs & Stratton SAE 30 4 stroke engine oil, is this ok for the PX gearbox?

Aye

[Ginch]

As long as it's non-detergent (ND) oil. I have some Briggs & Stratton 30 weight oil for the mower and it says it is a detergent oil.
You can use an API GL4 gear oil (75-80 or thereabouts) which may be better. Don't use GL5, it has additives that attack the yellow metal parts.

[djh66]

Just out of interest.........if the brass thrust washer (the one with a upturned lip on the outside) is fitted upside down (lip facing down) would this cause drag?

[soulboy]

yes

[djh66]

yes

mmmm.......... i cant swear, but i'm sure it was face down when I took the clutch out! I will put it back the correct way, re assemble the clutch (after soaking the corks) and prey.

[Juan]

Odds on are the turrets in your basket aren't deep enough to allow the clutch to disengauge fully, they need to be 22mm. It's a known fault on Cosa cluthes.

[djh66]

Odds on are the turrets in your basket aren't deep enough to allow the clutch to disengauge fully, they need to be 22mm. It's a known fault on Cosa cluthes.

It was ok before the rebuild, I think Harry just put new springs and corks in.
However, I've reassembled and fitted the clutch back in and it still drags, the thrust washer was the correct way round.

[GLscoot]

Im in the process of removing all the cosa clutches in my scooters, just don't trust them anymore. I think out of four cosa clutches in the last couple of years I have had one good one. Use banded clutches now. plenty of choices.
gary